Merge branch 'master' of github.com:pks/cdec-dtrain

22 files changed, 8308 insertions, 1194 deletions

diff --git a/decoder/ff_ngrams.cc b/decoder/ff_ngrams.cc
index d6d79f5e..9c13fdbb 100644
--- a/decoder/ff_ngrams.cc
+++ b/decoder/ff_ngrams.cc
@@ -48,6 +48,9 @@ struct State {
 
 namespace {
   string Escape(const string& x) {
+    if (x.find('=') == string::npos && x.find(';') == string::npos) {
+      return x;
+    }
     string y = x;
     for (int i = 0; i < y.size(); ++i) {
       if (y[i] == '=') y[i]='_';
@@ -57,10 +60,17 @@ namespace {
   }
 }
 
-static bool ParseArgs(string const& in, bool* explicit_markers, unsigned* order) {
+static bool ParseArgs(string const& in, bool* explicit_markers, unsigned* order, vector<string>& prefixes, string& target_separator) {
   vector<string> const& argv=SplitOnWhitespace(in);
   *explicit_markers = false;
   *order = 3;
+  prefixes.push_back("NOT-USED");
+  prefixes.push_back("U:"); // default unigram prefix
+  prefixes.push_back("B:"); // default bigram prefix
+  prefixes.push_back("T:"); // ...etc
+  prefixes.push_back("4:"); // ...etc
+  prefixes.push_back("5:"); // max allowed!
+  target_separator = "_";
 #define LMSPEC_NEXTARG if (i==argv.end()) {            \
     cerr << "Missing argument for "<<*last<<". "; goto usage; \
     } else { ++i; }
@@ -73,6 +83,30 @@ static bool ParseArgs(string const& in, bool* explicit_markers, unsigned* order)
       case 'x':
         *explicit_markers = true;
         break;
+      case 'U':
+	LMSPEC_NEXTARG;
+	prefixes[1] = *i;
+	break;
+      case 'B':
+	LMSPEC_NEXTARG;
+	prefixes[2] = *i;
+	break;
+      case 'T':
+	LMSPEC_NEXTARG;
+	prefixes[3] = *i;
+	break;
+      case '4':
+	LMSPEC_NEXTARG;
+	prefixes[4] = *i;
+	break;
+      case '5':
+	LMSPEC_NEXTARG;
+	prefixes[5] = *i;
+	break;
+      case 'S':
+	LMSPEC_NEXTARG;
+	target_separator = *i;
+	break;
       case 'o':
         LMSPEC_NEXTARG; *order=atoi((*i).c_str());
         break;
@@ -86,7 +120,29 @@ static bool ParseArgs(string const& in, bool* explicit_markers, unsigned* order)
   }
   return true;
 usage:
-  cerr << "NgramFeatures is incorrect!\n";
+  cerr << "Wrong parameters for NgramFeatures.\n\n"
+
+       << "NgramFeatures Usage: \n"			     
+       << " feature_function=NgramFeatures filename.lm [-x] [-o <order>] \n"
+       << " [-U <unigram-prefix>] [-B <bigram-prefix>][-T <trigram-prefix>]\n"
+       << " [-4 <4-gram-prefix>] [-5 <5-gram-prefix>] [-S <separator>]\n\n" 
+    
+       << "Defaults: \n"
+       << "  <order>          = 3\n" 
+       << "  <unigram-prefix> = U:\n"
+       << "  <bigram-prefix>  = B:\n"
+       << "  <trigram-prefix> = T:\n"
+       << "  <4-gram-prefix>  = 4:\n"
+       << "  <5-gram-prefix>  = 5:\n"
+       << "  <separator>      = _\n"
+       << "  -x (i.e. explicit sos/eos markers) is turned off\n\n"
+
+       << "Example configuration: \n"
+       << "  feature_function=NgramFeatures -o 3 -T tri: -S |\n\n"
+
+       << "Example feature instantiation: \n"
+       << "  tri:a|b|c \n\n";
+
   return false;
 }
 
@@ -158,16 +214,12 @@ class NgramDetectorImpl {
       int& fid = ft->fids[curword];
       ++n;
       if (!fid) {
-        const char* code="_UBT456789"; // prefix code (unigram, bigram, etc.)
         ostringstream os;
-        os << code[n] << ':';
+        os << prefixes_[n];
         for (int i = n-1; i >= 0; --i) {
-          os << (i != n-1 ? "_" : "");
+          os << (i != n-1 ? target_separator_ : "");
           const string& tok = TD::Convert(buf[i]);
-          if (tok.find('=') == string::npos)
-            os << tok;
-          else
-            os << Escape(tok);
+	  os << Escape(tok);
         }
         fid = FD::Convert(os.str());
       }
@@ -297,7 +349,8 @@ class NgramDetectorImpl {
   }
 
  public:
-  explicit NgramDetectorImpl(bool explicit_markers, unsigned order) :
+  explicit NgramDetectorImpl(bool explicit_markers, unsigned order,
+			     vector<string>& prefixes, string& target_separator) :
       kCDEC_UNK(TD::Convert("<unk>")) ,
       add_sos_eos_(!explicit_markers) {
     order_ = order;
@@ -305,6 +358,8 @@ class NgramDetectorImpl {
     unscored_size_offset_ = (order_ - 1) * sizeof(WordID);
     is_complete_offset_ = unscored_size_offset_ + 1;
     unscored_words_offset_ = is_complete_offset_ + 1;
+    prefixes_ = prefixes;
+    target_separator_ = target_separator;
 
     // special handling of beginning / ending sentence markers
     dummy_state_ = new char[state_size_];
@@ -340,6 +395,8 @@ class NgramDetectorImpl {
   char* dummy_state_;
   vector<const void*> dummy_ants_;
   TRulePtr dummy_rule_;
+  vector<string> prefixes_;
+  string target_separator_;
   struct FidTree {
     map<WordID, int> fids;
     map<WordID, FidTree> levels;
@@ -348,11 +405,13 @@ class NgramDetectorImpl {
 };
 
 NgramDetector::NgramDetector(const string& param) {
-  string filename, mapfile, featname;
+  string filename, mapfile, featname, target_separator;
+  vector<string> prefixes;
   bool explicit_markers = false;
   unsigned order = 3;
-  ParseArgs(param, &explicit_markers, &order);
-  pimpl_ = new NgramDetectorImpl(explicit_markers, order);
+  ParseArgs(param, &explicit_markers, &order, prefixes, target_separator);
+  pimpl_ = new NgramDetectorImpl(explicit_markers, order, prefixes, 
+				 target_separator);
   SetStateSize(pimpl_->ReserveStateSize());
 }
 
diff --git a/decoder/ff_ngrams.h b/decoder/ff_ngrams.h
index 82f61b33..064dbb49 100644
--- a/decoder/ff_ngrams.h
+++ b/decoder/ff_ngrams.h
@@ -10,7 +10,7 @@
 struct NgramDetectorImpl;
 class NgramDetector : public FeatureFunction {
  public:
-  // param = "filename.lm [-o n]"
+  // param = "filename.lm [-o <order>] [-U <unigram-prefix>] [-B <bigram-prefix>] [-T <trigram-prefix>] [-4 <4-gram-prefix>] [-5 <5-gram-prefix>] [-S <separator>]
   NgramDetector(const std::string& param);
   ~NgramDetector();
   virtual void FinalTraversalFeatures(const void* context,
diff --git a/dtrain/score.cc b/dtrain/score.cc
index 4a7cac6e..34fc86a9 100644
--- a/dtrain/score.cc
+++ b/dtrain/score.cc
@@ -103,7 +103,7 @@ SmoothBleuScorer::Score(vector<WordID>& hyp, vector<WordID>& ref,
         i_bleu[j] += (1/((score_t)j+1)) * i_ng;
       }
     }
-    sum += exp(i_bleu[i])/(pow(2.0, N_-i));
+    sum += exp(i_bleu[i])/pow(2.0, (double)(N_-i));
   }
   return brevity_penalty(hyp_len, ref_len) * sum;
 }
@@ -126,7 +126,7 @@ SumBleuScorer::Score(vector<WordID>& hyp, vector<WordID>& ref,
   unsigned j = 1;
   for (unsigned i = 0; i < M; i++) {
     if (counts.sum_[i] == 0 || counts.clipped_[i] == 0) break;
-    sum += ((score_t)counts.clipped_[i]/counts.sum_[i])/pow(2., N_-j+1);
+    sum += ((score_t)counts.clipped_[i]/counts.sum_[i])/pow(2.0, (double) (N_-j+1));
     j++;
   }
   return brevity_penalty(hyp_len, ref_len) * sum;
@@ -150,7 +150,7 @@ SumExpBleuScorer::Score(vector<WordID>& hyp, vector<WordID>& ref,
   unsigned j = 1;
   for (unsigned i = 0; i < M; i++) {
     if (counts.sum_[i] == 0 || counts.clipped_[i] == 0) break;
-    sum += exp(((score_t)counts.clipped_[i]/counts.sum_[i]))/pow(2., N_-j+1);
+    sum += exp(((score_t)counts.clipped_[i]/counts.sum_[i]))/pow(2.0, (double) (N_-j+1));
     j++;
   }
   return brevity_penalty(hyp_len, ref_len) * sum;
@@ -178,7 +178,7 @@ SumWhateverBleuScorer::Score(vector<WordID>& hyp, vector<WordID>& ref,
   unsigned j = 1;
   for (unsigned i = 0; i < M; i++) {
     if (counts.sum_[i] == 0 || counts.clipped_[i] == 0) break;
-    sum += exp(v[i] * log(((score_t)counts.clipped_[i]/counts.sum_[i])))/pow(2., N_-j+1);
+    sum += exp(v[i] * log(((score_t)counts.clipped_[i]/counts.sum_[i])))/pow(2.0, (double) (N_-j+1));
     j++;
   }
   return brevity_penalty(hyp_len, ref_len) * sum;
diff --git a/minrisk/minrisk_optimize.cc b/minrisk/minrisk_optimize.cc
index 6e651994..da8b5260 100644
--- a/minrisk/minrisk_optimize.cc
+++ b/minrisk/minrisk_optimize.cc
@@ -17,6 +17,7 @@
 #include "ns_docscorer.h"
 #include "candidate_set.h"
 #include "risk.h"
+#include "entropy.h"
 
 using namespace std;
 namespace po = boost::program_options;
@@ -28,6 +29,9 @@ void InitCommandLine(int argc, char** argv, po::variables_map* conf) {
         ("weights,w",po::value<string>(), "[REQD] Weights files from current iterations")
         ("input,i",po::value<string>()->default_value("-"), "Input file to map (- is STDIN)")
         ("evaluation_metric,m",po::value<string>()->default_value("IBM_BLEU"), "Evaluation metric (ibm_bleu, koehn_bleu, nist_bleu, ter, meteor, etc.)")
+        ("temperature,T",po::value<double>()->default_value(0.0), "Temperature parameter for objective (>0 increases the entropy)")
+        ("l1_strength,C",po::value<double>()->default_value(0.0), "L1 regularization strength")
+        ("memory_buffers,M",po::value<unsigned>()->default_value(20), "Memory buffers used in LBFGS")
         ("kbest_repository,R",po::value<string>(), "Accumulate k-best lists from previous iterations (parameter is path to repository)")
         ("kbest_size,k",po::value<unsigned>()->default_value(500u), "Top k-hypotheses to extract")
         ("help,h", "Help");
@@ -52,36 +56,80 @@ void InitCommandLine(int argc, char** argv, po::variables_map* conf) {
 EvaluationMetric* metric = NULL;
 
 struct RiskObjective {
-  explicit RiskObjective(const vector<training::CandidateSet>& tr) : training(tr) {}
+  explicit RiskObjective(const vector<training::CandidateSet>& tr, const double temp) : training(tr), T(temp) {}
   double operator()(const vector<double>& x, double* g) const {
     fill(g, g + x.size(), 0.0);
     double obj = 0;
+    double h = 0;
     for (unsigned i = 0; i < training.size(); ++i) {
       training::CandidateSetRisk risk(training[i], *metric);
-      SparseVector<double> tg;
+      training::CandidateSetEntropy entropy(training[i]);
+      SparseVector<double> tg, hg;
       double r = risk(x, &tg);
+      double hh = entropy(x, &hg);
+      h += hh;
       obj += r;
       for (SparseVector<double>::iterator it = tg.begin(); it != tg.end(); ++it)
         g[it->first] += it->second;
+      if (T) {
+        for (SparseVector<double>::iterator it = hg.begin(); it != hg.end(); ++it)
+          g[it->first] += T * it->second;
+      }
     }
-    cerr << (1-(obj / training.size())) << endl;
-    return obj;
+    cerr << (1-(obj / training.size())) << "  H=" << h << endl;
+    return obj - T * h;
   }
   const vector<training::CandidateSet>& training;
+  const double T; // temperature for entropy regularization
 };  
 
 double LearnParameters(const vector<training::CandidateSet>& training,
+                       const double temp, // > 0 increases the entropy, < 0 decreases the entropy
                        const double C1,
                        const unsigned memory_buffers,
                        vector<weight_t>* px) {
-  RiskObjective obj(training);
+  RiskObjective obj(training, temp);
   LBFGS<RiskObjective> lbfgs(px, obj, memory_buffers, C1);
   lbfgs.MinimizeFunction();
   return 0;
 }
 
-// runs lines 4--15 of rampion algorithm
+#if 0
+struct FooLoss {
+  double operator()(const vector<double>& x, double* g) const {
+    fill(g, g + x.size(), 0.0);
+    training::CandidateSet cs;
+    training::CandidateSetEntropy cse(cs);
+    cs.cs.resize(3);
+    cs.cs[0].fmap.set_value(FD::Convert("F1"), -1.0);
+    cs.cs[1].fmap.set_value(FD::Convert("F2"), 1.0);
+    cs.cs[2].fmap.set_value(FD::Convert("F1"), 2.0);
+    cs.cs[2].fmap.set_value(FD::Convert("F2"), 0.5);
+    SparseVector<double> xx;
+    double h = cse(x, &xx);
+    cerr << cse(x, &xx) << endl; cerr << "G: " << xx << endl;
+    for (SparseVector<double>::iterator i = xx.begin(); i != xx.end(); ++i)
+      g[i->first] += i->second;
+    return -h;
+  }
+};
+#endif
+
 int main(int argc, char** argv) {
+#if 0
+  training::CandidateSet cs;
+  training::CandidateSetEntropy cse(cs);
+  cs.cs.resize(3);
+  cs.cs[0].fmap.set_value(FD::Convert("F1"), -1.0);
+  cs.cs[1].fmap.set_value(FD::Convert("F2"), 1.0);
+  cs.cs[2].fmap.set_value(FD::Convert("F1"), 2.0);
+  cs.cs[2].fmap.set_value(FD::Convert("F2"), 0.5);
+  FooLoss foo;
+  vector<double> ww(FD::NumFeats()); ww[FD::Convert("F1")] = 1.0;
+  LBFGS<FooLoss> lbfgs(&ww, foo, 100, 0.0);
+  lbfgs.MinimizeFunction();
+  return 1;
+#endif
   po::variables_map conf;
   InitCommandLine(argc, argv, &conf);
   const string evaluation_metric = conf["evaluation_metric"].as<string>();
@@ -89,8 +137,6 @@ int main(int argc, char** argv) {
   metric = EvaluationMetric::Instance(evaluation_metric);
   DocumentScorer ds(metric, conf["reference"].as<vector<string> >());
   cerr << "Loaded " << ds.size() << " references for scoring with " << evaluation_metric << endl;
-  double goodsign = -1;
-  double badsign = -goodsign;
 
   Hypergraph hg;
   string last_file;
@@ -141,7 +187,10 @@ int main(int argc, char** argv) {
   cerr << "\nHypergraphs loaded.\n";
   weights.resize(FD::NumFeats());
 
-  LearnParameters(kis, 0.0, 100, &weights);
+  double c1 = conf["l1_strength"].as<double>();
+  double temp = conf["temperature"].as<double>();
+  unsigned m = conf["memory_buffers"].as<unsigned>();
+  LearnParameters(kis, temp, c1, m, &weights);
   Weights::WriteToFile("-", weights);
   return 0;
 }
diff --git a/python/cdec/__init__.py b/python/cdec/__init__.py
index eda81194..0d7b8782 100644
--- a/python/cdec/__init__.py
+++ b/python/cdec/__init__.py
@@ -1 +1,2 @@
 from _cdec import Decoder, Lattice
+import score
diff --git a/python/cdec/score.py b/python/cdec/score.py
new file mode 100644
index 00000000..c107446f
--- /dev/null
+++ b/python/cdec/score.py
@@ -0,0 +1 @@
+from _cdec import BLEU, TER
diff --git a/python/setup.py b/python/setup.py
index 49a1ec8f..cc8b289d 100644
--- a/python/setup.py
+++ b/python/setup.py
@@ -3,8 +3,8 @@ from distutils.extension import Extension
 from Cython.Distutils import build_ext
 import os
 
-INC = ['..', 'src/', '../decoder', '../utils']
-LIB = ['../decoder', '../utils', '../mteval', '../klm/lm', '../klm/util']
+INC = ['..', 'src/', '../decoder', '../utils', '../mteval']
+LIB = ['../decoder', '../utils', '../mteval', '../training', '../klm/lm', '../klm/util']
 
 BOOST_ROOT = os.getenv('BOOST_ROOT')
 if BOOST_ROOT:
@@ -18,7 +18,8 @@ ext_modules = [
         include_dirs=INC,
         library_dirs=LIB,
         libraries=['boost_program_options-mt', 'z',
-                   'cdec', 'utils', 'mteval', 'klm', 'klm_util'])
+                   'cdec', 'utils', 'mteval', 'training', 'klm', 'klm_util'],
+        extra_compile_args=['-DHAVE_CONFIG_H']),
 ]
 
 setup(
diff --git a/python/src/_cdec.cpp b/python/src/_cdec.cpp
index 0b9b9911..3a127ba9 100644
--- a/python/src/_cdec.cpp
+++ b/python/src/_cdec.cpp
@@ -1,4 +1,4 @@
-/* Generated by Cython 0.16 on Sat Jun 23 11:57:21 2012 */
+/* Generated by Cython 0.16 on Thu Jul  5 16:20:15 2012 */
 
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
@@ -279,11 +279,12 @@
 #include "utils/wordid.h"
 #include "utils/small_vector.h"
 #include "utils/sparse_vector.h"
-#include "utils/tdict.cc"
+#include "utils/tdict.h"
 #include "utils/verbose.h"
 #include "utils/fdict.h"
 #include "utils/filelib.h"
 #include "utils/sampler.h"
+#include <boost/shared_ptr.hpp>
 #include "decoder/lattice.h"
 #include "decoder/hg.h"
 #include "decoder/viterbi.h"
@@ -295,6 +296,8 @@
 #include "decoder/decoder.h"
 #include "observer.h"
 #include "decoder/kbest.h"
+#include "mteval/ns.h"
+#include "training/candidate_set.h"
 #ifdef _OPENMP
 #include <omp.h>
 #endif /* _OPENMP */
@@ -381,50 +384,96 @@ static const char *__pyx_f[] = {
   "vectors.pxi",
   "hypergraph.pxi",
   "lattice.pxi",
+  "mteval.pxi",
 };
 
 /*--- Type declarations ---*/
-struct __pyx_obj_5_cdec___pyx_scope_struct_4_sample;
+struct __pyx_obj_5_cdec_Scorer;
+struct __pyx_obj_5_cdec_CandidateSet;
+struct __pyx_obj_5_cdec_SufficientStats;
 struct __pyx_obj_5_cdec___pyx_scope_struct_1___iter__;
+struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features;
 struct __pyx_obj_5_cdec___pyx_scope_struct_3_kbest_tree;
 struct __pyx_obj_5_cdec_Decoder;
+struct __pyx_obj_5_cdec_SegmentEvaluator;
 struct __pyx_obj_5_cdec_SparseVector;
 struct __pyx_obj_5_cdec_Hypergraph;
 struct __pyx_obj_5_cdec_Lattice;
-struct __pyx_obj_5_cdec___pyx_scope_struct_5___iter__;
 struct __pyx_obj_5_cdec___pyx_scope_struct____iter__;
 struct __pyx_obj_5_cdec___pyx_scope_struct_2_kbest;
+struct __pyx_obj_5_cdec_Candidate;
+struct __pyx_obj_5_cdec___pyx_scope_struct_8_lines;
+struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample;
 struct __pyx_obj_5_cdec_DenseVector;
+struct __pyx_obj_5_cdec___pyx_scope_struct_6___iter__;
+struct __pyx_obj_5_cdec___pyx_scope_struct_9___iter__;
+struct __pyx_obj_5_cdec___pyx_scope_struct_10___iter__;
+struct __pyx_obj_5_cdec___pyx_scope_struct_7_todot;
+struct __pyx_opt_args_5_cdec_as_str;
+
+/* "/Users/vchahun/Sandbox/cdec/python/src/mteval.pxi":3
+ * cimport mteval
+ * 
+ * cdef char* as_str(sentence, error_msg='Cannot convert type %s to str'):             # <<<<<<<<<<<<<<
+ *     cdef bytes ret
+ *     if isinstance(sentence, unicode):
+ */
+struct __pyx_opt_args_5_cdec_as_str {
+  int __pyx_n;
+  PyObject *error_msg;
+};
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":56
- *         del derivations
+/* "/Users/vchahun/Sandbox/cdec/python/src/mteval.pxi":122
+ *         return CandidateSet(self)
+ * 
+ * cdef class Scorer:             # <<<<<<<<<<<<<<
+ *     cdef string* name
  * 
- *     def sample(self, unsigned n):             # <<<<<<<<<<<<<<
- *         cdef vector[hypergraph.Hypothesis]* hypos = new vector[hypergraph.Hypothesis]()
- *         if self.rng == NULL:
  */
-struct __pyx_obj_5_cdec___pyx_scope_struct_4_sample {
+struct __pyx_obj_5_cdec_Scorer {
   PyObject_HEAD
-  std::vector<HypergraphSampler::Hypothesis> *__pyx_v_hypos;
-  unsigned int __pyx_v_k;
-  unsigned int __pyx_v_n;
-  struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self;
-  PyObject *__pyx_v_sentence;
-  size_t __pyx_t_0;
-  unsigned int __pyx_t_1;
+  std::string *name;
+};
+
+
+/* "/Users/vchahun/Sandbox/cdec/python/src/mteval.pxi":70
+ *         return result
+ * 
+ * cdef class CandidateSet:             # <<<<<<<<<<<<<<
+ *     cdef shared_ptr[mteval.SegmentEvaluator]* scorer
+ *     cdef mteval.EvaluationMetric* metric
+ */
+struct __pyx_obj_5_cdec_CandidateSet {
+  PyObject_HEAD
+  boost::shared_ptr<SegmentEvaluator> *scorer;
+  EvaluationMetric *metric;
+  training::CandidateSet *cs;
+};
+
+
+/* "/Users/vchahun/Sandbox/cdec/python/src/mteval.pxi":36
+ *             return fmap
+ * 
+ * cdef class SufficientStats:             # <<<<<<<<<<<<<<
+ *     cdef mteval.SufficientStats* stats
+ *     cdef mteval.EvaluationMetric* metric
+ */
+struct __pyx_obj_5_cdec_SufficientStats {
+  PyObject_HEAD
+  SufficientStats *stats;
+  EvaluationMetric *metric;
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":43
+/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":55
  *         self.vector.set_value(fid, value)
  * 
  *     def __iter__(self):             # <<<<<<<<<<<<<<
  *         cdef FastSparseVector[weight_t].const_iterator* it = new FastSparseVector[weight_t].const_iterator(self.vector[0], False)
- *         cdef str fname
+ *         try:
  */
 struct __pyx_obj_5_cdec___pyx_scope_struct_1___iter__ {
   PyObject_HEAD
-  PyObject *__pyx_v_fname;
   size_t __pyx_v_i;
   FastSparseVector<weight_t>::const_iterator *__pyx_v_it;
   struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self;
@@ -433,8 +482,28 @@ struct __pyx_obj_5_cdec___pyx_scope_struct_1___iter__ {
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":44
- *         del derivations
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":60
+ *             del derivations
+ * 
+ *     def kbest_features(self, size):             # <<<<<<<<<<<<<<
+ *         cdef kb.KBestDerivations[FastSparseVector[weight_t], kb.FeatureVectorTraversal]* derivations = new kb.KBestDerivations[FastSparseVector[weight_t], kb.FeatureVectorTraversal](self.hg[0], size)
+ *         cdef kb.KBestDerivations[FastSparseVector[weight_t], kb.FeatureVectorTraversal].Derivation* derivation
+ */
+struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features {
+  PyObject_HEAD
+  KBest::KBestDerivations<FastSparseVector<weight_t>,FeatureVectorTraversal>::Derivation *__pyx_v_derivation;
+  KBest::KBestDerivations<FastSparseVector<weight_t>,FeatureVectorTraversal> *__pyx_v_derivations;
+  struct __pyx_obj_5_cdec_SparseVector *__pyx_v_fmap;
+  unsigned int __pyx_v_k;
+  struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self;
+  PyObject *__pyx_v_size;
+  unsigned int __pyx_t_0;
+  long __pyx_t_1;
+};
+
+
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":46
+ *             del derivations
  * 
  *     def kbest_tree(self, size):             # <<<<<<<<<<<<<<
  *         cdef kb.KBestDerivations[vector[WordID], kb.ETreeTraversal]* derivations = new kb.KBestDerivations[vector[WordID], kb.ETreeTraversal](self.hg[0], size)
@@ -454,11 +523,11 @@ struct __pyx_obj_5_cdec___pyx_scope_struct_3_kbest_tree {
 
 
 /* "_cdec.pyx":15
- *     pass
+ * class ParseFailed(Exception): pass
  * 
  * cdef class Decoder:             # <<<<<<<<<<<<<<
  *     cdef decoder.Decoder* dec
- *     cdef public DenseVector weights
+ *     cdef DenseVector weights
  */
 struct __pyx_obj_5_cdec_Decoder {
   PyObject_HEAD
@@ -467,7 +536,21 @@ struct __pyx_obj_5_cdec_Decoder {
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":32
+/* "/Users/vchahun/Sandbox/cdec/python/src/mteval.pxi":103
+ *         self.cs.AddKBestCandidates(hypergraph.hg[0], k, self.scorer.get())
+ * 
+ * cdef class SegmentEvaluator:             # <<<<<<<<<<<<<<
+ *     cdef shared_ptr[mteval.SegmentEvaluator]* scorer
+ *     cdef mteval.EvaluationMetric* metric
+ */
+struct __pyx_obj_5_cdec_SegmentEvaluator {
+  PyObject_HEAD
+  boost::shared_ptr<SegmentEvaluator> *scorer;
+  EvaluationMetric *metric;
+};
+
+
+/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":36
  *         return sparse
  * 
  * cdef class SparseVector:             # <<<<<<<<<<<<<<
@@ -507,23 +590,7 @@ struct __pyx_obj_5_cdec_Lattice {
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/lattice.pxi":50
- *         return hypergraph.AsPLF(self.lattice[0], True).c_str()
- * 
- *     def __iter__(self):             # <<<<<<<<<<<<<<
- *         cdef unsigned i
- *         for i in range(len(self)):
- */
-struct __pyx_obj_5_cdec___pyx_scope_struct_5___iter__ {
-  PyObject_HEAD
-  unsigned int __pyx_v_i;
-  struct __pyx_obj_5_cdec_Lattice *__pyx_v_self;
-  Py_ssize_t __pyx_t_0;
-  unsigned int __pyx_t_1;
-};
-
-
-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":18
+/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":22
  *         self.vector[0][fid] = value
  * 
  *     def __iter__(self):             # <<<<<<<<<<<<<<
@@ -559,11 +626,67 @@ struct __pyx_obj_5_cdec___pyx_scope_struct_2_kbest {
 };
 
 
+/* "/Users/vchahun/Sandbox/cdec/python/src/mteval.pxi":22
+ *         return stats
+ * 
+ * cdef class Candidate:             # <<<<<<<<<<<<<<
+ *     cdef mteval.Candidate* candidate
+ *     cdef public float score
+ */
+struct __pyx_obj_5_cdec_Candidate {
+  PyObject_HEAD
+  const training::Candidate *candidate;
+  float score;
+};
+
+
+/* "/Users/vchahun/Sandbox/cdec/python/src/lattice.pxi":59
+ * 
+ *     def todot(self):
+ *         def lines():             # <<<<<<<<<<<<<<
+ *             yield 'digraph lattice {'
+ *             yield 'rankdir = LR;'
+ */
+struct __pyx_obj_5_cdec___pyx_scope_struct_8_lines {
+  PyObject_HEAD
+  struct __pyx_obj_5_cdec___pyx_scope_struct_7_todot *__pyx_outer_scope;
+  PyObject *__pyx_v_delta;
+  PyObject *__pyx_v_i;
+  PyObject *__pyx_v_label;
+  PyObject *__pyx_v_weight;
+  Py_ssize_t __pyx_t_0;
+  PyObject *__pyx_t_1;
+  PyObject *(*__pyx_t_2)(PyObject *);
+  PyObject *__pyx_t_3;
+  Py_ssize_t __pyx_t_4;
+  PyObject *(*__pyx_t_5)(PyObject *);
+};
+
+
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":75
+ *             del derivations
+ * 
+ *     def sample(self, unsigned n):             # <<<<<<<<<<<<<<
+ *         cdef vector[hypergraph.Hypothesis]* hypos = new vector[hypergraph.Hypothesis]()
+ *         if self.rng == NULL:
+ */
+struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample {
+  PyObject_HEAD
+  std::vector<HypergraphSampler::Hypothesis> *__pyx_v_hypos;
+  unsigned int __pyx_v_k;
+  unsigned int __pyx_v_n;
+  struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self;
+  PyObject *__pyx_v_sentence;
+  size_t __pyx_t_0;
+  unsigned int __pyx_t_1;
+};
+
+
 /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":3
  * from cython.operator cimport preincrement as pinc
  * 
  * cdef class DenseVector:             # <<<<<<<<<<<<<<
- *     cdef vector[weight_t]* vector
+ *     cdef vector[weight_t]* vector # Not owned by DenseVector
  * 
  */
 struct __pyx_obj_5_cdec_DenseVector {
@@ -571,6 +694,68 @@ struct __pyx_obj_5_cdec_DenseVector {
   std::vector<weight_t> *vector;
 };
 
+
+/* "/Users/vchahun/Sandbox/cdec/python/src/lattice.pxi":50
+ *         return hypergraph.AsPLF(self.lattice[0], True).c_str()
+ * 
+ *     def __iter__(self):             # <<<<<<<<<<<<<<
+ *         cdef unsigned i
+ *         for i in range(len(self)):
+ */
+struct __pyx_obj_5_cdec___pyx_scope_struct_6___iter__ {
+  PyObject_HEAD
+  unsigned int __pyx_v_i;
+  struct __pyx_obj_5_cdec_Lattice *__pyx_v_self;
+  Py_ssize_t __pyx_t_0;
+  unsigned int __pyx_t_1;
+};
+
+
+/* "/Users/vchahun/Sandbox/cdec/python/src/mteval.pxi":54
+ *         return self.stats.size()
+ * 
+ *     def __iter__(self):             # <<<<<<<<<<<<<<
+ *         for i in range(len(self)):
+ *             yield self.stats[0][i]
+ */
+struct __pyx_obj_5_cdec___pyx_scope_struct_9___iter__ {
+  PyObject_HEAD
+  PyObject *__pyx_v_i;
+  struct __pyx_obj_5_cdec_SufficientStats *__pyx_v_self;
+  Py_ssize_t __pyx_t_0;
+  PyObject *__pyx_t_1;
+  PyObject *(*__pyx_t_2)(PyObject *);
+};
+
+
+/* "/Users/vchahun/Sandbox/cdec/python/src/mteval.pxi":95
+ *         return candidate
+ * 
+ *     def __iter__(self):             # <<<<<<<<<<<<<<
+ *         cdef unsigned i
+ *         for i in range(len(self)):
+ */
+struct __pyx_obj_5_cdec___pyx_scope_struct_10___iter__ {
+  PyObject_HEAD
+  unsigned int __pyx_v_i;
+  struct __pyx_obj_5_cdec_CandidateSet *__pyx_v_self;
+  Py_ssize_t __pyx_t_0;
+  unsigned int __pyx_t_1;
+};
+
+
+/* "/Users/vchahun/Sandbox/cdec/python/src/lattice.pxi":58
+ *         del self.lattice
+ * 
+ *     def todot(self):             # <<<<<<<<<<<<<<
+ *         def lines():
+ *             yield 'digraph lattice {'
+ */
+struct __pyx_obj_5_cdec___pyx_scope_struct_7_todot {
+  PyObject_HEAD
+  struct __pyx_obj_5_cdec_Lattice *__pyx_v_self;
+};
+
 #ifndef CYTHON_REFNANNY
   #define CYTHON_REFNANNY 0
 #endif
@@ -635,6 +820,8 @@ static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb, PyObject
 static int __Pyx_ArgTypeTest(PyObject *obj, PyTypeObject *type, int none_allowed,
     const char *name, int exact); /*proto*/
 
+static CYTHON_INLINE int __Pyx_TypeTest(PyObject *obj, PyTypeObject *type); /*proto*/
+
 static void __Pyx_RaiseDoubleKeywordsError(const char* func_name, PyObject* kw_name); /*proto*/
 
 static int __Pyx_ParseOptionalKeywords(PyObject *kwds, PyObject **argnames[], \
@@ -729,6 +916,8 @@ static CYTHON_INLINE PyObject *__Pyx_GetItemInt_Fast(PyObject *o, Py_ssize_t i)
     return __Pyx_GetItemInt_Generic(o, PyInt_FromSsize_t(i));
 }
 
+static CYTHON_INLINE void __Pyx_RaiseClosureNameError(const char *varname);
+
 static double __Pyx__PyObject_AsDouble(PyObject* obj); /* proto */
 #define __Pyx_PyObject_AsDouble(obj) \
 ((likely(PyFloat_CheckExact(obj))) ? \
@@ -736,8 +925,6 @@ static double __Pyx__PyObject_AsDouble(PyObject* obj); /* proto */
 
 static int __Pyx_GetException(PyObject **type, PyObject **value, PyObject **tb); /*proto*/
 
-static CYTHON_INLINE int __Pyx_TypeTest(PyObject *obj, PyTypeObject *type); /*proto*/
-
 static CYTHON_INLINE void __Pyx_ExceptionSave(PyObject **type, PyObject **value, PyObject **tb); /*proto*/
 static void __Pyx_ExceptionReset(PyObject *type, PyObject *value, PyObject *tb); /*proto*/
 
@@ -748,6 +935,48 @@ static PyObject *__Pyx_CreateClass(PyObject *bases, PyObject *dict, PyObject *na
 
 static PyObject* __Pyx_Globals(void); /*proto*/
 
+#define __Pyx_CyFunction_USED 1
+#include <structmember.h>
+#define __Pyx_CYFUNCTION_STATICMETHOD  0x01
+#define __Pyx_CYFUNCTION_CLASSMETHOD   0x02
+#define __Pyx_CYFUNCTION_CCLASS        0x04
+#define __Pyx_CyFunction_GetClosure(f) \
+    (((__pyx_CyFunctionObject *) (f))->func_closure)
+#define __Pyx_CyFunction_GetClassObj(f) \
+    (((__pyx_CyFunctionObject *) (f))->func_classobj)
+#define __Pyx_CyFunction_Defaults(type, f) \
+    ((type *)(((__pyx_CyFunctionObject *) (f))->defaults))
+#define __Pyx_CyFunction_SetDefaultsGetter(f, g) \
+    ((__pyx_CyFunctionObject *) (f))->defaults_getter = (g)
+typedef struct {
+    PyCFunctionObject func;
+    int flags;
+    PyObject *func_dict;
+    PyObject *func_weakreflist;
+    PyObject *func_name;
+    PyObject *func_doc;
+    PyObject *func_code;
+    PyObject *func_closure;
+    PyObject *func_classobj; /* No-args super() class cell */
+    void *defaults;
+    int defaults_pyobjects;
+    PyObject *defaults_tuple; /* Const defaults tuple */
+    PyObject *(*defaults_getter)(PyObject *);
+} __pyx_CyFunctionObject;
+static PyTypeObject *__pyx_CyFunctionType = 0;
+#define __Pyx_CyFunction_NewEx(ml, flags, self, module, code) \
+    __Pyx_CyFunction_New(__pyx_CyFunctionType, ml, flags, self, module, code)
+static PyObject *__Pyx_CyFunction_New(PyTypeObject *,
+                                      PyMethodDef *ml, int flags,
+                                      PyObject *self, PyObject *module,
+                                      PyObject* code);
+static CYTHON_INLINE void *__Pyx_CyFunction_InitDefaults(PyObject *m,
+                                                         size_t size,
+                                                         int pyobjects);
+static CYTHON_INLINE void __Pyx_CyFunction_SetDefaultsTuple(PyObject *m,
+                                                            PyObject *tuple);
+static int __Pyx_CyFunction_init(void);
+
 static CYTHON_INLINE unsigned char __Pyx_PyInt_AsUnsignedChar(PyObject *);
 
 static CYTHON_INLINE unsigned short __Pyx_PyInt_AsUnsignedShort(PyObject *);
@@ -801,6 +1030,9 @@ static __pyx_GeneratorObject *__Pyx_Generator_New(__pyx_generator_body_t body,
                                                   PyObject *closure);
 static int __pyx_Generator_init(void);
 
+static void __Pyx_WriteUnraisable(const char *name, int clineno,
+                                  int lineno, const char *filename); /*proto*/
+
 static int __Pyx_check_binary_version(void);
 
 typedef struct {
@@ -841,18 +1073,32 @@ static int __Pyx_InitStrings(__Pyx_StringTabEntry *t); /*proto*/
 
 /* Module declarations from 'kbest' */
 
+/* Module declarations from 'mteval' */
+
 /* Module declarations from '_cdec' */
 static PyTypeObject *__pyx_ptype_5_cdec_DenseVector = 0;
 static PyTypeObject *__pyx_ptype_5_cdec_SparseVector = 0;
 static PyTypeObject *__pyx_ptype_5_cdec_Hypergraph = 0;
 static PyTypeObject *__pyx_ptype_5_cdec_Lattice = 0;
+static PyTypeObject *__pyx_ptype_5_cdec_Candidate = 0;
+static PyTypeObject *__pyx_ptype_5_cdec_SufficientStats = 0;
+static PyTypeObject *__pyx_ptype_5_cdec_CandidateSet = 0;
+static PyTypeObject *__pyx_ptype_5_cdec_SegmentEvaluator = 0;
+static PyTypeObject *__pyx_ptype_5_cdec_Scorer = 0;
 static PyTypeObject *__pyx_ptype_5_cdec_Decoder = 0;
 static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct____iter__ = 0;
 static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_1___iter__ = 0;
 static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_2_kbest = 0;
 static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_3_kbest_tree = 0;
-static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_4_sample = 0;
-static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_5___iter__ = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_4_kbest_features = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_5_sample = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_6___iter__ = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_7_todot = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_8_lines = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_9___iter__ = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_10___iter__ = 0;
+static char *__pyx_f_5_cdec_as_str(PyObject *, struct __pyx_opt_args_5_cdec_as_str *__pyx_optional_args); /*proto*/
+static struct __pyx_obj_5_cdec_SufficientStats *__pyx_f_5_cdec_as_stats(PyObject *, PyObject *); /*proto*/
 #define __Pyx_MODULE_NAME "_cdec"
 int __pyx_module_is_main__cdec = 0;
 
@@ -860,34 +1106,40 @@ int __pyx_module_is_main__cdec = 0;
 static PyObject *__pyx_builtin_Exception;
 static PyObject *__pyx_builtin_KeyError;
 static PyObject *__pyx_builtin_range;
-static PyObject *__pyx_builtin_ValueError;
+static PyObject *__pyx_builtin_TypeError;
 static PyObject *__pyx_builtin_NotImplemented;
 static PyObject *__pyx_builtin_eval;
 static PyObject *__pyx_builtin_enumerate;
-static PyObject *__pyx_builtin_TypeError;
 static PyObject *__pyx_builtin_IndexError;
 static PyObject *__pyx_builtin_open;
-static PyObject *__pyx_pf_5_cdec_11DenseVector___getitem__(struct __pyx_obj_5_cdec_DenseVector *__pyx_v_self, char *__pyx_v_fname); /* proto */
-static int __pyx_pf_5_cdec_11DenseVector_2__setitem__(struct __pyx_obj_5_cdec_DenseVector *__pyx_v_self, char *__pyx_v_fname, float __pyx_v_value); /* proto */
-static PyObject *__pyx_pf_5_cdec_11DenseVector_4__iter__(struct __pyx_obj_5_cdec_DenseVector *__pyx_v_self); /* proto */
-static PyObject *__pyx_pf_5_cdec_11DenseVector_7dot(struct __pyx_obj_5_cdec_DenseVector *__pyx_v_self, struct __pyx_obj_5_cdec_SparseVector *__pyx_v_other); /* proto */
-static PyObject *__pyx_pf_5_cdec_11DenseVector_9tosparse(struct __pyx_obj_5_cdec_DenseVector *__pyx_v_self); /* proto */
-static PyObject *__pyx_pf_5_cdec_12SparseVector___getitem__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, char *__pyx_v_fname); /* proto */
-static int __pyx_pf_5_cdec_12SparseVector_2__setitem__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, char *__pyx_v_fname, float __pyx_v_value); /* proto */
-static PyObject *__pyx_pf_5_cdec_12SparseVector_4__iter__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self); /* proto */
-static PyObject *__pyx_pf_5_cdec_12SparseVector_7dot(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, PyObject *__pyx_v_other); /* proto */
-static PyObject *__pyx_pf_5_cdec_12SparseVector_9todense(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self); /* proto */
-static PyObject *__pyx_pf_5_cdec_12SparseVector_11__richcmp__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, struct __pyx_obj_5_cdec_SparseVector *__pyx_v_other, int __pyx_v_op); /* proto */
-static Py_ssize_t __pyx_pf_5_cdec_12SparseVector_13__len__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self); /* proto */
-static int __pyx_pf_5_cdec_12SparseVector_15__contains__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, char *__pyx_v_fname); /* proto */
-static PyObject *__pyx_pf_5_cdec_12SparseVector_17__iadd__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, struct __pyx_obj_5_cdec_SparseVector *__pyx_v_other); /* proto */
-static PyObject *__pyx_pf_5_cdec_12SparseVector_19__isub__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, struct __pyx_obj_5_cdec_SparseVector *__pyx_v_other); /* proto */
-static PyObject *__pyx_pf_5_cdec_12SparseVector_21__imul__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, float __pyx_v_scalar); /* proto */
+static Py_ssize_t __pyx_pf_5_cdec_11DenseVector___len__(struct __pyx_obj_5_cdec_DenseVector *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_11DenseVector_2__getitem__(struct __pyx_obj_5_cdec_DenseVector *__pyx_v_self, char *__pyx_v_fname); /* proto */
+static int __pyx_pf_5_cdec_11DenseVector_4__setitem__(struct __pyx_obj_5_cdec_DenseVector *__pyx_v_self, char *__pyx_v_fname, float __pyx_v_value); /* proto */
+static PyObject *__pyx_pf_5_cdec_11DenseVector_6__iter__(struct __pyx_obj_5_cdec_DenseVector *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_11DenseVector_9dot(struct __pyx_obj_5_cdec_DenseVector *__pyx_v_self, struct __pyx_obj_5_cdec_SparseVector *__pyx_v_other); /* proto */
+static PyObject *__pyx_pf_5_cdec_11DenseVector_11tosparse(struct __pyx_obj_5_cdec_DenseVector *__pyx_v_self); /* proto */
+static void __pyx_pf_5_cdec_12SparseVector___dealloc__(CYTHON_UNUSED struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_12SparseVector_2copy(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_12SparseVector_4__getitem__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, char *__pyx_v_fname); /* proto */
+static int __pyx_pf_5_cdec_12SparseVector_6__setitem__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, char *__pyx_v_fname, float __pyx_v_value); /* proto */
+static PyObject *__pyx_pf_5_cdec_12SparseVector_8__iter__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_12SparseVector_11dot(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, PyObject *__pyx_v_other); /* proto */
+static PyObject *__pyx_pf_5_cdec_12SparseVector_13__richcmp__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_x, struct __pyx_obj_5_cdec_SparseVector *__pyx_v_y, int __pyx_v_op); /* proto */
+static Py_ssize_t __pyx_pf_5_cdec_12SparseVector_15__len__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self); /* proto */
+static int __pyx_pf_5_cdec_12SparseVector_17__contains__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, char *__pyx_v_fname); /* proto */
+static PyObject *__pyx_pf_5_cdec_12SparseVector_19__neg__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_12SparseVector_21__iadd__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, struct __pyx_obj_5_cdec_SparseVector *__pyx_v_other); /* proto */
+static PyObject *__pyx_pf_5_cdec_12SparseVector_23__isub__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, struct __pyx_obj_5_cdec_SparseVector *__pyx_v_other); /* proto */
+static PyObject *__pyx_pf_5_cdec_12SparseVector_25__imul__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, float __pyx_v_scalar); /* proto */
+#if PY_MAJOR_VERSION < 3
+static PyObject *__pyx_pf_5_cdec_12SparseVector_27__idiv__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, float __pyx_v_scalar); /* proto */
+#endif
+static PyObject *__pyx_pf_5_cdec_12SparseVector_29__add__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_x, struct __pyx_obj_5_cdec_SparseVector *__pyx_v_y); /* proto */
+static PyObject *__pyx_pf_5_cdec_12SparseVector_31__sub__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_x, struct __pyx_obj_5_cdec_SparseVector *__pyx_v_y); /* proto */
+static PyObject *__pyx_pf_5_cdec_12SparseVector_33__mul__(PyObject *__pyx_v_x, PyObject *__pyx_v_y); /* proto */
 #if PY_MAJOR_VERSION < 3
-static PyObject *__pyx_pf_5_cdec_12SparseVector_23__idiv__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, float __pyx_v_scalar); /* proto */
+static PyObject *__pyx_pf_5_cdec_12SparseVector_35__div__(PyObject *__pyx_v_x, PyObject *__pyx_v_y); /* proto */
 #endif
-static PyObject *__pyx_pf_5_cdec_12SparseVector_25__add__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, struct __pyx_obj_5_cdec_SparseVector *__pyx_v_other); /* proto */
-static PyObject *__pyx_pf_5_cdec_12SparseVector_27__sub__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, struct __pyx_obj_5_cdec_SparseVector *__pyx_v_other); /* proto */
 static void __pyx_pf_5_cdec_10Hypergraph___dealloc__(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self); /* proto */
 static PyObject *__pyx_pf_5_cdec_10Hypergraph_2viterbi(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self); /* proto */
 static PyObject *__pyx_pf_5_cdec_10Hypergraph_4viterbi_tree(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self); /* proto */
@@ -895,11 +1147,12 @@ static PyObject *__pyx_pf_5_cdec_10Hypergraph_6viterbi_source_tree(struct __pyx_
 static PyObject *__pyx_pf_5_cdec_10Hypergraph_8viterbi_features(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self); /* proto */
 static PyObject *__pyx_pf_5_cdec_10Hypergraph_10kbest(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self, PyObject *__pyx_v_size); /* proto */
 static PyObject *__pyx_pf_5_cdec_10Hypergraph_13kbest_tree(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self, PyObject *__pyx_v_size); /* proto */
-static PyObject *__pyx_pf_5_cdec_10Hypergraph_16sample(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self, unsigned int __pyx_v_n); /* proto */
-static PyObject *__pyx_pf_5_cdec_10Hypergraph_19intersect(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self, struct __pyx_obj_5_cdec_Lattice *__pyx_v_lat); /* proto */
-static PyObject *__pyx_pf_5_cdec_10Hypergraph_21prune(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self, PyObject *__pyx_v_beam_alpha, PyObject *__pyx_v_density, PyObject *__pyx_v_kwargs); /* proto */
-static PyObject *__pyx_pf_5_cdec_10Hypergraph_23lattice(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self); /* proto */
-static PyObject *__pyx_pf_5_cdec_10Hypergraph_25reweight(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self, PyObject *__pyx_v_weights); /* proto */
+static PyObject *__pyx_pf_5_cdec_10Hypergraph_16kbest_features(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self, PyObject *__pyx_v_size); /* proto */
+static PyObject *__pyx_pf_5_cdec_10Hypergraph_19sample(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self, unsigned int __pyx_v_n); /* proto */
+static PyObject *__pyx_pf_5_cdec_10Hypergraph_22intersect(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self, struct __pyx_obj_5_cdec_Lattice *__pyx_v_lat); /* proto */
+static PyObject *__pyx_pf_5_cdec_10Hypergraph_24prune(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self, PyObject *__pyx_v_beam_alpha, PyObject *__pyx_v_density, PyObject *__pyx_v_kwargs); /* proto */
+static PyObject *__pyx_pf_5_cdec_10Hypergraph_26lattice(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_10Hypergraph_28reweight(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self, PyObject *__pyx_v_weights); /* proto */
 static int __pyx_pf_5_cdec_7Lattice___init__(struct __pyx_obj_5_cdec_Lattice *__pyx_v_self, PyObject *__pyx_v_inp); /* proto */
 static PyObject *__pyx_pf_5_cdec_7Lattice_2__getitem__(struct __pyx_obj_5_cdec_Lattice *__pyx_v_self, int __pyx_v_index); /* proto */
 static int __pyx_pf_5_cdec_7Lattice_4__setitem__(struct __pyx_obj_5_cdec_Lattice *__pyx_v_self, int __pyx_v_index, PyObject *__pyx_v_arcs); /* proto */
@@ -907,48 +1160,102 @@ static Py_ssize_t __pyx_pf_5_cdec_7Lattice_6__len__(struct __pyx_obj_5_cdec_Latt
 static PyObject *__pyx_pf_5_cdec_7Lattice_8__str__(struct __pyx_obj_5_cdec_Lattice *__pyx_v_self); /* proto */
 static PyObject *__pyx_pf_5_cdec_7Lattice_10__iter__(struct __pyx_obj_5_cdec_Lattice *__pyx_v_self); /* proto */
 static void __pyx_pf_5_cdec_7Lattice_13__dealloc__(CYTHON_UNUSED struct __pyx_obj_5_cdec_Lattice *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_7Lattice_5todot_lines(PyObject *__pyx_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_7Lattice_15todot(struct __pyx_obj_5_cdec_Lattice *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_9Candidate_5words___get__(struct __pyx_obj_5_cdec_Candidate *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_9Candidate_4fmap___get__(struct __pyx_obj_5_cdec_Candidate *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_9Candidate_5score___get__(struct __pyx_obj_5_cdec_Candidate *__pyx_v_self); /* proto */
+static int __pyx_pf_5_cdec_9Candidate_5score_2__set__(struct __pyx_obj_5_cdec_Candidate *__pyx_v_self, PyObject *__pyx_v_value); /* proto */
+static void __pyx_pf_5_cdec_15SufficientStats___dealloc__(CYTHON_UNUSED struct __pyx_obj_5_cdec_SufficientStats *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_15SufficientStats_5score___get__(struct __pyx_obj_5_cdec_SufficientStats *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_15SufficientStats_6detail___get__(struct __pyx_obj_5_cdec_SufficientStats *__pyx_v_self); /* proto */
+static Py_ssize_t __pyx_pf_5_cdec_15SufficientStats_2__len__(struct __pyx_obj_5_cdec_SufficientStats *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_15SufficientStats_4__iter__(struct __pyx_obj_5_cdec_SufficientStats *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_15SufficientStats_7__iadd__(struct __pyx_obj_5_cdec_SufficientStats *__pyx_v_self, struct __pyx_obj_5_cdec_SufficientStats *__pyx_v_other); /* proto */
+static PyObject *__pyx_pf_5_cdec_15SufficientStats_9__add__(PyObject *__pyx_v_x, PyObject *__pyx_v_y); /* proto */
+static int __pyx_pf_5_cdec_12CandidateSet___cinit__(struct __pyx_obj_5_cdec_CandidateSet *__pyx_v_self, struct __pyx_obj_5_cdec_SegmentEvaluator *__pyx_v_evaluator); /* proto */
+static void __pyx_pf_5_cdec_12CandidateSet_2__dealloc__(CYTHON_UNUSED struct __pyx_obj_5_cdec_CandidateSet *__pyx_v_self); /* proto */
+static Py_ssize_t __pyx_pf_5_cdec_12CandidateSet_4__len__(struct __pyx_obj_5_cdec_CandidateSet *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_12CandidateSet_6__getitem__(struct __pyx_obj_5_cdec_CandidateSet *__pyx_v_self, int __pyx_v_k); /* proto */
+static PyObject *__pyx_pf_5_cdec_12CandidateSet_8__iter__(struct __pyx_obj_5_cdec_CandidateSet *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_12CandidateSet_11add_kbest(struct __pyx_obj_5_cdec_CandidateSet *__pyx_v_self, struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_hypergraph, unsigned int __pyx_v_k); /* proto */
+static void __pyx_pf_5_cdec_16SegmentEvaluator___dealloc__(CYTHON_UNUSED struct __pyx_obj_5_cdec_SegmentEvaluator *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_16SegmentEvaluator_2evaluate(struct __pyx_obj_5_cdec_SegmentEvaluator *__pyx_v_self, PyObject *__pyx_v_sentence); /* proto */
+static PyObject *__pyx_pf_5_cdec_16SegmentEvaluator_4candidate_set(struct __pyx_obj_5_cdec_SegmentEvaluator *__pyx_v_self); /* proto */
+static int __pyx_pf_5_cdec_6Scorer___cinit__(struct __pyx_obj_5_cdec_Scorer *__pyx_v_self, char *__pyx_v_name); /* proto */
+static void __pyx_pf_5_cdec_6Scorer_2__dealloc__(CYTHON_UNUSED struct __pyx_obj_5_cdec_Scorer *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_6Scorer_4__call__(struct __pyx_obj_5_cdec_Scorer *__pyx_v_self, PyObject *__pyx_v_refs); /* proto */
+static PyObject *__pyx_pf_5_cdec_6Scorer_6__str__(struct __pyx_obj_5_cdec_Scorer *__pyx_v_self); /* proto */
 static int __pyx_pf_5_cdec_7Decoder___cinit__(struct __pyx_obj_5_cdec_Decoder *__pyx_v_self, char *__pyx_v_config); /* proto */
 static void __pyx_pf_5_cdec_7Decoder_2__dealloc__(CYTHON_UNUSED struct __pyx_obj_5_cdec_Decoder *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_7Decoder_7weights___get__(struct __pyx_obj_5_cdec_Decoder *__pyx_v_self); /* proto */
+static int __pyx_pf_5_cdec_7Decoder_7weights_2__set__(struct __pyx_obj_5_cdec_Decoder *__pyx_v_self, PyObject *__pyx_v_weights); /* proto */
 static PyObject *__pyx_pf_5_cdec_7Decoder_4read_weights(struct __pyx_obj_5_cdec_Decoder *__pyx_v_self, PyObject *__pyx_v_cfg); /* proto */
 static PyObject *__pyx_pf_5_cdec_7Decoder_6translate(struct __pyx_obj_5_cdec_Decoder *__pyx_v_self, PyObject *__pyx_v_sentence, PyObject *__pyx_v_grammar); /* proto */
-static PyObject *__pyx_pf_5_cdec_7Decoder_7weights___get__(struct __pyx_obj_5_cdec_Decoder *__pyx_v_self); /* proto */
-static int __pyx_pf_5_cdec_7Decoder_7weights_2__set__(struct __pyx_obj_5_cdec_Decoder *__pyx_v_self, PyObject *__pyx_v_value); /* proto */
-static int __pyx_pf_5_cdec_7Decoder_7weights_4__del__(struct __pyx_obj_5_cdec_Decoder *__pyx_v_self); /* proto */
 static char __pyx_k_1[] = "cannot take the dot product of %s and SparseVector";
 static char __pyx_k_2[] = "comparison not implemented for SparseVector";
 static char __pyx_k_10[] = "csplit_preserve_full_word";
 static char __pyx_k_11[] = "cannot reweight hypergraph with %s";
 static char __pyx_k_13[] = "Cannot create lattice from %s";
 static char __pyx_k_14[] = "lattice index out of range";
-static char __pyx_k_21[] = "Cannot translate input type %s";
+static char __pyx_k_19[] = "digraph lattice {";
+  static char __pyx_k_20[] = "rankdir = LR;";
+  static char __pyx_k_21[] = "node [shape=circle];";
+  static char __pyx_k_22[] = "%d -> %d [label=\"%s\"];";
+  static char __pyx_k_23[] = "\"";
+  static char __pyx_k_24[] = "\\\"";
+  static char __pyx_k_26[] = "%d [shape=doublecircle]";
+static char __pyx_k_27[] = "}";
+static char __pyx_k_30[] = "/Users/vchahun/Sandbox/cdec/python/src/lattice.pxi";
+static char __pyx_k_31[] = "\n";
+static char __pyx_k_33[] = "Cannot convert type %s to str";
+static char __pyx_k_35[] = "candidate set index out of range";
+static char __pyx_k_37[] = "cannot initialize weights with %s";
+static char __pyx_k_40[] = "Cannot translate input type %s";
+static char __pyx_k__i[] = "i";
+static char __pyx_k__k[] = "k";
+static char __pyx_k__TER[] = "TER";
 static char __pyx_k__dot[] = "dot";
 static char __pyx_k__inp[] = "inp";
 static char __pyx_k__plf[] = "plf";
+static char __pyx_k__BLEU[] = "BLEU";
 static char __pyx_k__eval[] = "eval";
+static char __pyx_k__join[] = "join";
+static char __pyx_k__name[] = "name";
 static char __pyx_k__open[] = "open";
+static char __pyx_k__refs[] = "refs";
 static char __pyx_k__self[] = "self";
 static char __pyx_k__utf8[] = "utf8";
 static char __pyx_k___cdec[] = "_cdec";
+static char __pyx_k__delta[] = "delta";
+static char __pyx_k__items[] = "items";
+static char __pyx_k__label[] = "label";
+static char __pyx_k__lines[] = "lines";
 static char __pyx_k__range[] = "range";
 static char __pyx_k__split[] = "split";
 static char __pyx_k__strip[] = "strip";
 static char __pyx_k__config[] = "config";
 static char __pyx_k__decode[] = "decode";
 static char __pyx_k__encode[] = "encode";
+static char __pyx_k__weight[] = "weight";
 static char __pyx_k__density[] = "density";
 static char __pyx_k__grammar[] = "grammar";
+static char __pyx_k__replace[] = "replace";
+static char __pyx_k__IBM_BLEU[] = "IBM_BLEU";
 static char __pyx_k__KeyError[] = "KeyError";
 static char __pyx_k____exit__[] = "__exit__";
 static char __pyx_k____main__[] = "__main__";
 static char __pyx_k____test__[] = "__test__";
+static char __pyx_k__encoding[] = "encoding";
 static char __pyx_k__sentence[] = "sentence";
 static char __pyx_k__Exception[] = "Exception";
 static char __pyx_k__TypeError[] = "TypeError";
 static char __pyx_k____enter__[] = "__enter__";
 static char __pyx_k__enumerate[] = "enumerate";
+static char __pyx_k__evaluator[] = "evaluator";
 static char __pyx_k__IndexError[] = "IndexError";
-static char __pyx_k__ValueError[] = "ValueError";
 static char __pyx_k__beam_alpha[] = "beam_alpha";
+static char __pyx_k__hypergraph[] = "hypergraph";
 static char __pyx_k__ParseFailed[] = "ParseFailed";
 static char __pyx_k__NotImplemented[] = "NotImplemented";
 static PyObject *__pyx_kp_s_1;
@@ -956,15 +1263,30 @@ static PyObject *__pyx_n_s_10;
 static PyObject *__pyx_kp_s_11;
 static PyObject *__pyx_kp_s_13;
 static PyObject *__pyx_kp_s_14;
+static PyObject *__pyx_kp_s_19;
 static PyObject *__pyx_kp_s_2;
+static PyObject *__pyx_kp_s_20;
 static PyObject *__pyx_kp_s_21;
+static PyObject *__pyx_kp_s_22;
+static PyObject *__pyx_kp_s_23;
+static PyObject *__pyx_kp_s_24;
+static PyObject *__pyx_kp_s_26;
+static PyObject *__pyx_kp_s_27;
+static PyObject *__pyx_kp_s_30;
+static PyObject *__pyx_kp_s_31;
+static PyObject *__pyx_kp_s_33;
+static PyObject *__pyx_kp_s_35;
+static PyObject *__pyx_kp_s_37;
+static PyObject *__pyx_kp_s_40;
+static PyObject *__pyx_n_s__BLEU;
 static PyObject *__pyx_n_s__Exception;
+static PyObject *__pyx_n_s__IBM_BLEU;
 static PyObject *__pyx_n_s__IndexError;
 static PyObject *__pyx_n_s__KeyError;
 static PyObject *__pyx_n_s__NotImplemented;
 static PyObject *__pyx_n_s__ParseFailed;
+static PyObject *__pyx_n_s__TER;
 static PyObject *__pyx_n_s__TypeError;
-static PyObject *__pyx_n_s__ValueError;
 static PyObject *__pyx_n_s____enter__;
 static PyObject *__pyx_n_s____exit__;
 static PyObject *__pyx_n_s____main__;
@@ -973,21 +1295,35 @@ static PyObject *__pyx_n_s___cdec;
 static PyObject *__pyx_n_s__beam_alpha;
 static PyObject *__pyx_n_s__config;
 static PyObject *__pyx_n_s__decode;
+static PyObject *__pyx_n_s__delta;
 static PyObject *__pyx_n_s__density;
 static PyObject *__pyx_n_s__dot;
 static PyObject *__pyx_n_s__encode;
+static PyObject *__pyx_n_s__encoding;
 static PyObject *__pyx_n_s__enumerate;
 static PyObject *__pyx_n_s__eval;
+static PyObject *__pyx_n_s__evaluator;
 static PyObject *__pyx_n_s__grammar;
+static PyObject *__pyx_n_s__hypergraph;
+static PyObject *__pyx_n_s__i;
 static PyObject *__pyx_n_s__inp;
+static PyObject *__pyx_n_s__items;
+static PyObject *__pyx_n_s__join;
+static PyObject *__pyx_n_s__k;
+static PyObject *__pyx_n_s__label;
+static PyObject *__pyx_n_s__lines;
+static PyObject *__pyx_n_s__name;
 static PyObject *__pyx_n_s__open;
 static PyObject *__pyx_n_s__plf;
 static PyObject *__pyx_n_s__range;
+static PyObject *__pyx_n_s__refs;
+static PyObject *__pyx_n_s__replace;
 static PyObject *__pyx_n_s__self;
 static PyObject *__pyx_n_s__sentence;
 static PyObject *__pyx_n_s__split;
 static PyObject *__pyx_n_s__strip;
 static PyObject *__pyx_n_s__utf8;
+static PyObject *__pyx_n_s__weight;
 static PyObject *__pyx_int_0;
 static PyObject *__pyx_int_1;
 static PyObject *__pyx_k_tuple_3;
@@ -1002,18 +1338,66 @@ static PyObject *__pyx_k_tuple_15;
 static PyObject *__pyx_k_tuple_16;
 static PyObject *__pyx_k_tuple_17;
 static PyObject *__pyx_k_tuple_18;
-static PyObject *__pyx_k_tuple_19;
-static PyObject *__pyx_k_tuple_20;
+static PyObject *__pyx_k_tuple_25;
+static PyObject *__pyx_k_tuple_28;
+static PyObject *__pyx_k_tuple_32;
+static PyObject *__pyx_k_tuple_34;
+static PyObject *__pyx_k_tuple_36;
+static PyObject *__pyx_k_tuple_38;
+static PyObject *__pyx_k_tuple_39;
+static PyObject *__pyx_k_tuple_41;
+static PyObject *__pyx_k_tuple_42;
+static PyObject *__pyx_k_codeobj_29;
+
+/* Python wrapper */
+static Py_ssize_t __pyx_pw_5_cdec_11DenseVector_1__len__(PyObject *__pyx_v_self); /*proto*/
+static Py_ssize_t __pyx_pw_5_cdec_11DenseVector_1__len__(PyObject *__pyx_v_self) {
+  Py_ssize_t __pyx_r;
+  __Pyx_RefNannyDeclarations
+  __Pyx_RefNannySetupContext("__len__ (wrapper)", 0);
+  __pyx_r = __pyx_pf_5_cdec_11DenseVector___len__(((struct __pyx_obj_5_cdec_DenseVector *)__pyx_v_self));
+  __Pyx_RefNannyFinishContext();
+  return __pyx_r;
+}
+
+/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":6
+ *     cdef vector[weight_t]* vector # Not owned by DenseVector
+ * 
+ *     def __len__(self):             # <<<<<<<<<<<<<<
+ *         return self.vector.size()
+ * 
+ */
+
+static Py_ssize_t __pyx_pf_5_cdec_11DenseVector___len__(struct __pyx_obj_5_cdec_DenseVector *__pyx_v_self) {
+  Py_ssize_t __pyx_r;
+  __Pyx_RefNannyDeclarations
+  __Pyx_RefNannySetupContext("__len__", 0);
+
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":7
+ * 
+ *     def __len__(self):
+ *         return self.vector.size()             # <<<<<<<<<<<<<<
+ * 
+ *     def __getitem__(self, char* fname):
+ */
+  __pyx_r = __pyx_v_self->vector->size();
+  goto __pyx_L0;
+
+  __pyx_r = 0;
+  __pyx_L0:;
+  __Pyx_RefNannyFinishContext();
+  return __pyx_r;
+}
 
 /* Python wrapper */
-static PyObject *__pyx_pw_5_cdec_11DenseVector_1__getitem__(PyObject *__pyx_v_self, PyObject *__pyx_arg_fname); /*proto*/
-static PyObject *__pyx_pw_5_cdec_11DenseVector_1__getitem__(PyObject *__pyx_v_self, PyObject *__pyx_arg_fname) {
+static PyObject *__pyx_pw_5_cdec_11DenseVector_3__getitem__(PyObject *__pyx_v_self, PyObject *__pyx_arg_fname); /*proto*/
+static PyObject *__pyx_pw_5_cdec_11DenseVector_3__getitem__(PyObject *__pyx_v_self, PyObject *__pyx_arg_fname) {
   char *__pyx_v_fname;
   PyObject *__pyx_r = 0;
   __Pyx_RefNannyDeclarations
   __Pyx_RefNannySetupContext("__getitem__ (wrapper)", 0);
   assert(__pyx_arg_fname); {
-    __pyx_v_fname = PyBytes_AsString(__pyx_arg_fname); if (unlikely((!__pyx_v_fname) && PyErr_Occurred())) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 6; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
+    __pyx_v_fname = PyBytes_AsString(__pyx_arg_fname); if (unlikely((!__pyx_v_fname) && PyErr_Occurred())) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 9; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
   }
   goto __pyx_L4_argument_unpacking_done;
   __pyx_L3_error:;
@@ -1021,21 +1405,21 @@ static PyObject *__pyx_pw_5_cdec_11DenseVector_1__getitem__(PyObject *__pyx_v_se
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":15
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":65
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":66
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":67
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":68
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":69
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-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":71
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-static PyObject *__pyx_pw_5_cdec_12SparseVector_20__isub__(PyObject *__pyx_v_self, PyObject *__pyx_v_other) {
+static PyObject *__pyx_pw_5_cdec_12SparseVector_24__isub__(PyObject *__pyx_v_self, PyObject *__pyx_v_other); /*proto*/
+static PyObject *__pyx_pw_5_cdec_12SparseVector_24__isub__(PyObject *__pyx_v_self, PyObject *__pyx_v_other) {
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-  __pyx_r = __pyx_pf_5_cdec_12SparseVector_19__isub__(((struct __pyx_obj_5_cdec_SparseVector *)__pyx_v_self), ((struct __pyx_obj_5_cdec_SparseVector *)__pyx_v_other));
+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_other), __pyx_ptype_5_cdec_SparseVector, 1, "other", 0))) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 94; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_r = __pyx_pf_5_cdec_12SparseVector_23__isub__(((struct __pyx_obj_5_cdec_SparseVector *)__pyx_v_self), ((struct __pyx_obj_5_cdec_SparseVector *)__pyx_v_other));
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@@ -2285,7 +2899,7 @@ static PyObject *__pyx_pw_5_cdec_12SparseVector_20__isub__(PyObject *__pyx_v_sel
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 }
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":81
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+static PyObject *__pyx_pf_5_cdec_12SparseVector_23__isub__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, struct __pyx_obj_5_cdec_SparseVector *__pyx_v_other) {
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":82
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":95
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":83
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":96
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+static PyObject *__pyx_pw_5_cdec_12SparseVector_26__imul__(PyObject *__pyx_v_self, PyObject *__pyx_arg_scalar); /*proto*/
+static PyObject *__pyx_pw_5_cdec_12SparseVector_26__imul__(PyObject *__pyx_v_self, PyObject *__pyx_arg_scalar) {
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+  __pyx_r = __pyx_pf_5_cdec_12SparseVector_25__imul__(((struct __pyx_obj_5_cdec_SparseVector *)__pyx_v_self), ((float)__pyx_v_scalar));
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-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":85
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-static PyObject *__pyx_pf_5_cdec_12SparseVector_21__imul__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, float __pyx_v_scalar) {
+static PyObject *__pyx_pf_5_cdec_12SparseVector_25__imul__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, float __pyx_v_scalar) {
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":86
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":87
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":100
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-static PyObject *__pyx_pw_5_cdec_12SparseVector_24__idiv__(PyObject *__pyx_v_self, PyObject *__pyx_arg_scalar) {
+static PyObject *__pyx_pw_5_cdec_12SparseVector_28__idiv__(PyObject *__pyx_v_self, PyObject *__pyx_arg_scalar); /*proto*/
+static PyObject *__pyx_pw_5_cdec_12SparseVector_28__idiv__(PyObject *__pyx_v_self, PyObject *__pyx_arg_scalar) {
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+  __pyx_r = __pyx_pf_5_cdec_12SparseVector_27__idiv__(((struct __pyx_obj_5_cdec_SparseVector *)__pyx_v_self), ((float)__pyx_v_scalar));
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-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":89
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-static PyObject *__pyx_pf_5_cdec_12SparseVector_23__idiv__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, float __pyx_v_scalar) {
+static PyObject *__pyx_pf_5_cdec_12SparseVector_27__idiv__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, float __pyx_v_scalar) {
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":90
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":91
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":104
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- *     def __add__(SparseVector self, SparseVector other):
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-static PyObject *__pyx_pw_5_cdec_12SparseVector_26__add__(PyObject *__pyx_v_self, PyObject *__pyx_v_other) {
+static PyObject *__pyx_pw_5_cdec_12SparseVector_30__add__(PyObject *__pyx_v_x, PyObject *__pyx_v_y); /*proto*/
+static PyObject *__pyx_pw_5_cdec_12SparseVector_30__add__(PyObject *__pyx_v_x, PyObject *__pyx_v_y) {
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+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_x), __pyx_ptype_5_cdec_SparseVector, 1, "x", 0))) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 106; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_y), __pyx_ptype_5_cdec_SparseVector, 1, "y", 0))) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 106; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_r = __pyx_pf_5_cdec_12SparseVector_29__add__(((struct __pyx_obj_5_cdec_SparseVector *)__pyx_v_x), ((struct __pyx_obj_5_cdec_SparseVector *)__pyx_v_y));
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-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":93
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- *     def __add__(SparseVector self, SparseVector other):             # <<<<<<<<<<<<<<
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-static PyObject *__pyx_pf_5_cdec_12SparseVector_25__add__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self, struct __pyx_obj_5_cdec_SparseVector *__pyx_v_other) {
+static PyObject *__pyx_pf_5_cdec_12SparseVector_29__add__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_x, struct __pyx_obj_5_cdec_SparseVector *__pyx_v_y) {
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":94
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+ *         result.vector = new FastSparseVector[weight_t](x.vector[0] + y.vector[0])
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-  __pyx_t_1 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_SparseVector)), ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 94; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_1 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_SparseVector)), ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 107; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":95
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-  __pyx_v_result->vector = new FastSparseVector<weight_t>(((__pyx_v_self->vector[0]) + (__pyx_v_other->vector[0])));
+  __pyx_v_result->vector = new FastSparseVector<weight_t>(((__pyx_v_x->vector[0]) + (__pyx_v_y->vector[0])));
 
-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":96
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- *         result.vector = new FastSparseVector[weight_t](self.vector[0] + other.vector[0])
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- *     def __sub__(SparseVector self, SparseVector other):
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-static PyObject *__pyx_pw_5_cdec_12SparseVector_28__sub__(PyObject *__pyx_v_self, PyObject *__pyx_v_other) {
+static PyObject *__pyx_pw_5_cdec_12SparseVector_32__sub__(PyObject *__pyx_v_x, PyObject *__pyx_v_y); /*proto*/
+static PyObject *__pyx_pw_5_cdec_12SparseVector_32__sub__(PyObject *__pyx_v_x, PyObject *__pyx_v_y) {
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-  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_other), __pyx_ptype_5_cdec_SparseVector, 1, "other", 0))) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 98; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_x), __pyx_ptype_5_cdec_SparseVector, 1, "x", 0))) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 111; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_y), __pyx_ptype_5_cdec_SparseVector, 1, "y", 0))) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 111; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_r = __pyx_pf_5_cdec_12SparseVector_31__sub__(((struct __pyx_obj_5_cdec_SparseVector *)__pyx_v_x), ((struct __pyx_obj_5_cdec_SparseVector *)__pyx_v_y));
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-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":98
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+  struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *__pyx_cur_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *)__pyx_generator->closure);
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-    case 1: goto __pyx_L7_resume_from_yield;
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+  if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 75; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
 
-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":57
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":76
  * 
  *     def sample(self, unsigned n):
  *         cdef vector[hypergraph.Hypothesis]* hypos = new vector[hypergraph.Hypothesis]()             # <<<<<<<<<<<<<<
@@ -3451,7 +4605,7 @@ static PyObject *__pyx_gb_5_cdec_10Hypergraph_18generator4(__pyx_GeneratorObject
  */
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":58
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":77
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":59
+    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":78
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":60
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":63
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+  /*try:*/ {
 
-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":64
+    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":83
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- *         del hypos
+ *         try:
+ *             for k in range(hypos.size()):             # <<<<<<<<<<<<<<
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  */
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-    __pyx_t_4 = 0;
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+
+      /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":84
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+ *         finally:
+ */
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":65
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- *         del hypos
- * 
+      /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":85
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-    if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 65; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":66
- *             sentence = GetString(hypos[0][k].words).c_str()
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- *         del hypos             # <<<<<<<<<<<<<<
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":87
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  * 
  *     # TODO richer k-best/sample output (feature vectors, trees?)
  */
-  delete __pyx_cur_scope->__pyx_v_hypos;
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@@ -3558,13 +4748,13 @@ static PyObject *__pyx_gb_5_cdec_10Hypergraph_18generator4(__pyx_GeneratorObject
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+static PyObject *__pyx_pw_5_cdec_10Hypergraph_23intersect(PyObject *__pyx_v_self, PyObject *__pyx_v_lat); /*proto*/
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+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_lat), __pyx_ptype_5_cdec_Lattice, 1, "lat", 0))) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 91; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -3573,7 +4763,7 @@ static PyObject *__pyx_pw_5_cdec_10Hypergraph_20intersect(PyObject *__pyx_v_self
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 }
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":70
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+static PyObject *__pyx_pf_5_cdec_10Hypergraph_22intersect(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self, struct __pyx_obj_5_cdec_Lattice *__pyx_v_lat) {
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":71
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+  __pyx_r = __pyx_pf_5_cdec_10Hypergraph_24prune(((struct __pyx_obj_5_cdec_Hypergraph *)__pyx_v_self), __pyx_v_beam_alpha, __pyx_v_density, __pyx_v_kwargs);
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-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":73
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+static PyObject *__pyx_pf_5_cdec_10Hypergraph_24prune(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self, PyObject *__pyx_v_beam_alpha, PyObject *__pyx_v_density, PyObject *__pyx_v_kwargs) {
   std::vector<bool> *__pyx_v_preserve_mask;
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@@ -3703,7 +4893,7 @@ static PyObject *__pyx_pf_5_cdec_10Hypergraph_21prune(struct __pyx_obj_5_cdec_Hy
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":74
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":95
  * 
  *     def prune(self, beam_alpha=0, density=0, **kwargs):
  *         cdef hypergraph.EdgeMask* preserve_mask = NULL             # <<<<<<<<<<<<<<
@@ -3712,17 +4902,17 @@ static PyObject *__pyx_pf_5_cdec_10Hypergraph_21prune(struct __pyx_obj_5_cdec_Hy
  */
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":75
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":96
  *     def prune(self, beam_alpha=0, density=0, **kwargs):
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+  __pyx_t_1 = ((PyDict_Contains(((PyObject *)__pyx_v_kwargs), ((PyObject *)__pyx_n_s_10)))); if (unlikely(__pyx_t_1 < 0)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 96; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   if (__pyx_t_1) {
 
-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":76
+    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":97
  *         cdef hypergraph.EdgeMask* preserve_mask = NULL
  *         if 'csplit_preserve_full_word' in kwargs:
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@@ -3731,28 +4921,50 @@ static PyObject *__pyx_pf_5_cdec_10Hypergraph_21prune(struct __pyx_obj_5_cdec_Hy
  */
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":77
+    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":98
  *         if 'csplit_preserve_full_word' in kwargs:
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  *         self.hg.PruneInsideOutside(beam_alpha, density, preserve_mask, False, 1, False)
- * 
+ *         if preserve_mask:
  */
     ((__pyx_v_preserve_mask[0])[CompoundSplit::GetFullWordEdgeIndex((__pyx_v_self->hg[0]))]) = 1;
     goto __pyx_L3;
   }
   __pyx_L3:;
 
-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":78
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":99
  *              preserve_mask = new hypergraph.EdgeMask(self.hg.edges_.size())
  *              preserve_mask[0][hypergraph.GetFullWordEdgeIndex(self.hg[0])] = True
  *         self.hg.PruneInsideOutside(beam_alpha, density, preserve_mask, False, 1, False)             # <<<<<<<<<<<<<<
+ *         if preserve_mask:
+ *             del preserve_mask
+ */
+  __pyx_t_2 = __pyx_PyFloat_AsDouble(__pyx_v_beam_alpha); if (unlikely((__pyx_t_2 == (double)-1) && PyErr_Occurred())) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 99; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_3 = __pyx_PyFloat_AsDouble(__pyx_v_density); if (unlikely((__pyx_t_3 == (double)-1) && PyErr_Occurred())) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 99; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_v_self->hg->PruneInsideOutside(__pyx_t_2, __pyx_t_3, __pyx_v_preserve_mask, 0, 1.0, 0);
+
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":100
+ *              preserve_mask[0][hypergraph.GetFullWordEdgeIndex(self.hg[0])] = True
+ *         self.hg.PruneInsideOutside(beam_alpha, density, preserve_mask, False, 1, False)
+ *         if preserve_mask:             # <<<<<<<<<<<<<<
+ *             del preserve_mask
+ * 
+ */
+  __pyx_t_1 = (__pyx_v_preserve_mask != 0);
+  if (__pyx_t_1) {
+
+    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":101
+ *         self.hg.PruneInsideOutside(beam_alpha, density, preserve_mask, False, 1, False)
+ *         if preserve_mask:
+ *             del preserve_mask             # <<<<<<<<<<<<<<
  * 
  *     def lattice(self): # TODO direct hg -> lattice conversion in cdec
  */
-  __pyx_t_2 = __pyx_PyFloat_AsDouble(__pyx_v_beam_alpha); if (unlikely((__pyx_t_2 == (double)-1) && PyErr_Occurred())) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 78; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_t_3 = __pyx_PyFloat_AsDouble(__pyx_v_density); if (unlikely((__pyx_t_3 == (double)-1) && PyErr_Occurred())) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 78; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_v_self->hg->PruneInsideOutside(__pyx_t_2, __pyx_t_3, __pyx_v_preserve_mask, 0, 1.0, 0);
+    delete __pyx_v_preserve_mask;
+    goto __pyx_L4;
+  }
+  __pyx_L4:;
 
   __pyx_r = Py_None; __Pyx_INCREF(Py_None);
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@@ -3766,25 +4978,25 @@ static PyObject *__pyx_pf_5_cdec_10Hypergraph_21prune(struct __pyx_obj_5_cdec_Hy
 }
 
 /* Python wrapper */
-static PyObject *__pyx_pw_5_cdec_10Hypergraph_24lattice(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused); /*proto*/
-static PyObject *__pyx_pw_5_cdec_10Hypergraph_24lattice(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused) {
+static PyObject *__pyx_pw_5_cdec_10Hypergraph_27lattice(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused); /*proto*/
+static PyObject *__pyx_pw_5_cdec_10Hypergraph_27lattice(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused) {
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-  __pyx_r = __pyx_pf_5_cdec_10Hypergraph_23lattice(((struct __pyx_obj_5_cdec_Hypergraph *)__pyx_v_self));
+  __pyx_r = __pyx_pf_5_cdec_10Hypergraph_26lattice(((struct __pyx_obj_5_cdec_Hypergraph *)__pyx_v_self));
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-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":80
- *         self.hg.PruneInsideOutside(beam_alpha, density, preserve_mask, False, 1, False)
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":103
+ *             del preserve_mask
  * 
  *     def lattice(self): # TODO direct hg -> lattice conversion in cdec             # <<<<<<<<<<<<<<
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-static PyObject *__pyx_pf_5_cdec_10Hypergraph_23lattice(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self) {
+static PyObject *__pyx_pf_5_cdec_10Hypergraph_26lattice(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self) {
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@@ -3796,20 +5008,20 @@ static PyObject *__pyx_pf_5_cdec_10Hypergraph_23lattice(struct __pyx_obj_5_cdec_
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":81
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":104
  * 
  *     def lattice(self): # TODO direct hg -> lattice conversion in cdec
  *         cdef str plf = hypergraph.AsPLF(self.hg[0], True).c_str()             # <<<<<<<<<<<<<<
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-  __pyx_t_1 = PyBytes_FromString(HypergraphIO::AsPLF((__pyx_v_self->hg[0]), 1).c_str()); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 81; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_1 = PyBytes_FromString(HypergraphIO::AsPLF((__pyx_v_self->hg[0]), 1).c_str()); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 104; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  if (!(likely(PyString_CheckExact(((PyObject *)__pyx_t_1)))||(PyErr_Format(PyExc_TypeError, "Expected str, got %.200s", Py_TYPE(((PyObject *)__pyx_t_1))->tp_name), 0))) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 81; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (!(likely(PyString_CheckExact(((PyObject *)__pyx_t_1)))||(PyErr_Format(PyExc_TypeError, "Expected str, got %.200s", Py_TYPE(((PyObject *)__pyx_t_1))->tp_name), 0))) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 104; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":82
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":105
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  *         cdef str plf = hypergraph.AsPLF(self.hg[0], True).c_str()
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@@ -3817,17 +5029,17 @@ static PyObject *__pyx_pf_5_cdec_10Hypergraph_23lattice(struct __pyx_obj_5_cdec_
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+  __pyx_t_1 = __Pyx_Globals(); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 105; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+  __pyx_t_2 = PyDict_New(); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 105; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+    if (PyDict_SetItem(__pyx_t_2, ((PyObject *)__pyx_n_s__self), ((PyObject *)__pyx_v_self)) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 105; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  __pyx_t_3 = PyTuple_New(3); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 82; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_3 = PyTuple_New(3); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 105; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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   __pyx_t_2 = 0;
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+  __pyx_t_2 = PyObject_Call(__pyx_builtin_eval, ((PyObject *)__pyx_t_3), NULL); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 105; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+  __pyx_t_3 = PyTuple_New(1); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 105; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+  __pyx_t_2 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_Lattice)), ((PyObject *)__pyx_t_3), NULL); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 105; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -3869,17 +5081,17 @@ static PyObject *__pyx_pf_5_cdec_10Hypergraph_23lattice(struct __pyx_obj_5_cdec_
 }
 
 /* Python wrapper */
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-static PyObject *__pyx_pw_5_cdec_10Hypergraph_26reweight(PyObject *__pyx_v_self, PyObject *__pyx_v_weights) {
+static PyObject *__pyx_pw_5_cdec_10Hypergraph_29reweight(PyObject *__pyx_v_self, PyObject *__pyx_v_weights); /*proto*/
+static PyObject *__pyx_pw_5_cdec_10Hypergraph_29reweight(PyObject *__pyx_v_self, PyObject *__pyx_v_weights) {
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+  __pyx_r = __pyx_pf_5_cdec_10Hypergraph_28reweight(((struct __pyx_obj_5_cdec_Hypergraph *)__pyx_v_self), ((PyObject *)__pyx_v_weights));
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-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":84
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-static PyObject *__pyx_pf_5_cdec_10Hypergraph_25reweight(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self, PyObject *__pyx_v_weights) {
+static PyObject *__pyx_pf_5_cdec_10Hypergraph_28reweight(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self, PyObject *__pyx_v_weights) {
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@@ -3898,7 +5110,7 @@ static PyObject *__pyx_pf_5_cdec_10Hypergraph_25reweight(struct __pyx_obj_5_cdec
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":85
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":86
+    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":109
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     goto __pyx_L3;
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":87
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":110
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":88
+    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":111
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  *             self.hg.Reweight((<DenseVector> weights).vector[0])             # <<<<<<<<<<<<<<
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- *             raise ValueError('cannot reweight hypergraph with %s' % type(weights))
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     goto __pyx_L3;
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":90
+    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":113
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  *         else:
- *             raise ValueError('cannot reweight hypergraph with %s' % type(weights))             # <<<<<<<<<<<<<<
+ *             raise TypeError('cannot reweight hypergraph with %s' % type(weights))             # <<<<<<<<<<<<<<
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 static PyObject *__pyx_pw_5_cdec_7Decoder_5read_weights(PyObject *__pyx_v_self, PyObject *__pyx_v_cfg) {
   PyObject *__pyx_r = 0;
@@ -5120,8 +9318,8 @@ static PyObject *__pyx_pw_5_cdec_7Decoder_5read_weights(PyObject *__pyx_v_self,
   return __pyx_r;
 }
 
-/* "_cdec.pyx":30
- *         del self.dec
+/* "_cdec.pyx":46
+ *                 raise TypeError('cannot initialize weights with %s' % type(weights))
  * 
  *     def read_weights(self, cfg):             # <<<<<<<<<<<<<<
  *         with open(cfg) as fp:
@@ -5156,7 +9354,7 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_4read_weights(struct __pyx_obj_5_cdec_
   int __pyx_clineno = 0;
   __Pyx_RefNannySetupContext("read_weights", 0);
 
-  /* "_cdec.pyx":31
+  /* "_cdec.pyx":47
  * 
  *     def read_weights(self, cfg):
  *         with open(cfg) as fp:             # <<<<<<<<<<<<<<
@@ -5164,19 +9362,19 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_4read_weights(struct __pyx_obj_5_cdec_
  *                 fname, value = line.split()
  */
   /*with:*/ {
-    __pyx_t_1 = PyTuple_New(1); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    __pyx_t_1 = PyTuple_New(1); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 47; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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     PyTuple_SET_ITEM(__pyx_t_1, 0, __pyx_v_cfg);
     __Pyx_GIVEREF(__pyx_v_cfg);
-    __pyx_t_2 = PyObject_Call(__pyx_builtin_open, ((PyObject *)__pyx_t_1), NULL); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    __pyx_t_2 = PyObject_Call(__pyx_builtin_open, ((PyObject *)__pyx_t_1), NULL); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 47; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
     __Pyx_GOTREF(__pyx_t_2);
     __Pyx_DECREF(((PyObject *)__pyx_t_1)); __pyx_t_1 = 0;
-    __pyx_t_3 = PyObject_GetAttr(__pyx_t_2, __pyx_n_s____exit__); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    __pyx_t_3 = PyObject_GetAttr(__pyx_t_2, __pyx_n_s____exit__); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 47; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-    __pyx_t_1 = PyObject_GetAttr(__pyx_t_2, __pyx_n_s____enter__); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
+    __pyx_t_1 = PyObject_GetAttr(__pyx_t_2, __pyx_n_s____enter__); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 47; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
     __Pyx_GOTREF(__pyx_t_1);
-    __pyx_t_4 = PyObject_Call(__pyx_t_1, ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_4)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
+    __pyx_t_4 = PyObject_Call(__pyx_t_1, ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_4)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 47; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
     __Pyx_GOTREF(__pyx_t_4);
     __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
     __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
@@ -5191,7 +9389,7 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_4read_weights(struct __pyx_obj_5_cdec_
           __pyx_v_fp = __pyx_t_4;
           __Pyx_DECREF(__pyx_t_4); __pyx_t_4 = 0;
 
-          /* "_cdec.pyx":32
+          /* "_cdec.pyx":48
  *     def read_weights(self, cfg):
  *         with open(cfg) as fp:
  *             for line in fp:             # <<<<<<<<<<<<<<
@@ -5202,7 +9400,7 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_4read_weights(struct __pyx_obj_5_cdec_
             __pyx_t_4 = __pyx_v_fp; __Pyx_INCREF(__pyx_t_4); __pyx_t_8 = 0;
             __pyx_t_9 = NULL;
           } else {
-            __pyx_t_8 = -1; __pyx_t_4 = PyObject_GetIter(__pyx_v_fp); if (unlikely(!__pyx_t_4)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 32; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
+            __pyx_t_8 = -1; __pyx_t_4 = PyObject_GetIter(__pyx_v_fp); if (unlikely(!__pyx_t_4)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 48; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
             __Pyx_GOTREF(__pyx_t_4);
             __pyx_t_9 = Py_TYPE(__pyx_t_4)->tp_iternext;
           }
@@ -5218,7 +9416,7 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_4read_weights(struct __pyx_obj_5_cdec_
               if (unlikely(!__pyx_t_2)) {
                 if (PyErr_Occurred()) {
                   if (likely(PyErr_ExceptionMatches(PyExc_StopIteration))) PyErr_Clear();
-                  else {__pyx_filename = __pyx_f[0]; __pyx_lineno = 32; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
+                  else {__pyx_filename = __pyx_f[0]; __pyx_lineno = 48; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
                 }
                 break;
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@@ -5228,16 +9426,16 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_4read_weights(struct __pyx_obj_5_cdec_
             __pyx_v_line = __pyx_t_2;
             __pyx_t_2 = 0;
 
-            /* "_cdec.pyx":33
+            /* "_cdec.pyx":49
  *         with open(cfg) as fp:
  *             for line in fp:
  *                 fname, value = line.split()             # <<<<<<<<<<<<<<
  *                 self.weights[fname.strip()] = float(value)
  * 
  */
-            __pyx_t_2 = PyObject_GetAttr(__pyx_v_line, __pyx_n_s__split); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 33; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
+            __pyx_t_2 = PyObject_GetAttr(__pyx_v_line, __pyx_n_s__split); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 49; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
             __Pyx_GOTREF(__pyx_t_2);
-            __pyx_t_1 = PyObject_Call(__pyx_t_2, ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 33; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
+            __pyx_t_1 = PyObject_Call(__pyx_t_2, ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 49; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
             __Pyx_GOTREF(__pyx_t_1);
             __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
             if ((likely(PyTuple_CheckExact(__pyx_t_1))) || (PyList_CheckExact(__pyx_t_1))) {
@@ -5246,7 +9444,7 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_4read_weights(struct __pyx_obj_5_cdec_
                 if (unlikely(PyTuple_GET_SIZE(sequence) != 2)) {
                   if (PyTuple_GET_SIZE(sequence) > 2) __Pyx_RaiseTooManyValuesError(2);
                   else __Pyx_RaiseNeedMoreValuesError(PyTuple_GET_SIZE(sequence));
-                  {__pyx_filename = __pyx_f[0]; __pyx_lineno = 33; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
+                  {__pyx_filename = __pyx_f[0]; __pyx_lineno = 49; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
                 }
                 __pyx_t_2 = PyTuple_GET_ITEM(sequence, 0); 
                 __pyx_t_10 = PyTuple_GET_ITEM(sequence, 1); 
@@ -5254,7 +9452,7 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_4read_weights(struct __pyx_obj_5_cdec_
                 if (unlikely(PyList_GET_SIZE(sequence) != 2)) {
                   if (PyList_GET_SIZE(sequence) > 2) __Pyx_RaiseTooManyValuesError(2);
                   else __Pyx_RaiseNeedMoreValuesError(PyList_GET_SIZE(sequence));
-                  {__pyx_filename = __pyx_f[0]; __pyx_lineno = 33; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
+                  {__pyx_filename = __pyx_f[0]; __pyx_lineno = 49; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
                 }
                 __pyx_t_2 = PyList_GET_ITEM(sequence, 0); 
                 __pyx_t_10 = PyList_GET_ITEM(sequence, 1); 
@@ -5264,7 +9462,7 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_4read_weights(struct __pyx_obj_5_cdec_
               __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
             } else {
               Py_ssize_t index = -1;
-              __pyx_t_11 = PyObject_GetIter(__pyx_t_1); if (unlikely(!__pyx_t_11)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 33; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
+              __pyx_t_11 = PyObject_GetIter(__pyx_t_1); if (unlikely(!__pyx_t_11)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 49; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
               __Pyx_GOTREF(__pyx_t_11);
               __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
               __pyx_t_12 = Py_TYPE(__pyx_t_11)->tp_iternext;
@@ -5272,14 +9470,14 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_4read_weights(struct __pyx_obj_5_cdec_
               __Pyx_GOTREF(__pyx_t_2);
               index = 1; __pyx_t_10 = __pyx_t_12(__pyx_t_11); if (unlikely(!__pyx_t_10)) goto __pyx_L18_unpacking_failed;
               __Pyx_GOTREF(__pyx_t_10);
-              if (__Pyx_IternextUnpackEndCheck(__pyx_t_12(__pyx_t_11), 2) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 33; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
+              if (__Pyx_IternextUnpackEndCheck(__pyx_t_12(__pyx_t_11), 2) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 49; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
               __Pyx_DECREF(__pyx_t_11); __pyx_t_11 = 0;
               goto __pyx_L19_unpacking_done;
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               __Pyx_DECREF(__pyx_t_11); __pyx_t_11 = 0;
               if (PyErr_Occurred() && PyErr_ExceptionMatches(PyExc_StopIteration)) PyErr_Clear();
               if (!PyErr_Occurred()) __Pyx_RaiseNeedMoreValuesError(index);
-              {__pyx_filename = __pyx_f[0]; __pyx_lineno = 33; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
+              {__pyx_filename = __pyx_f[0]; __pyx_lineno = 49; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
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             __Pyx_XDECREF(__pyx_v_fname);
@@ -5289,22 +9487,22 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_4read_weights(struct __pyx_obj_5_cdec_
             __pyx_v_value = __pyx_t_10;
             __pyx_t_10 = 0;
 
-            /* "_cdec.pyx":34
+            /* "_cdec.pyx":50
  *             for line in fp:
  *                 fname, value = line.split()
  *                 self.weights[fname.strip()] = float(value)             # <<<<<<<<<<<<<<
  * 
  *     def translate(self, sentence, grammar=None):
  */
-            __pyx_t_13 = __Pyx_PyObject_AsDouble(__pyx_v_value); if (unlikely(__pyx_t_13 == ((double)-1) && PyErr_Occurred())) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 34; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
-            __pyx_t_1 = PyFloat_FromDouble(__pyx_t_13); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 34; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
+            __pyx_t_13 = __Pyx_PyObject_AsDouble(__pyx_v_value); if (unlikely(__pyx_t_13 == ((double)-1) && PyErr_Occurred())) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 50; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
+            __pyx_t_1 = PyFloat_FromDouble(__pyx_t_13); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 50; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
             __Pyx_GOTREF(__pyx_t_1);
-            __pyx_t_10 = PyObject_GetAttr(__pyx_v_fname, __pyx_n_s__strip); if (unlikely(!__pyx_t_10)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 34; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
+            __pyx_t_10 = PyObject_GetAttr(__pyx_v_fname, __pyx_n_s__strip); if (unlikely(!__pyx_t_10)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 50; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
             __Pyx_GOTREF(__pyx_t_10);
-            __pyx_t_2 = PyObject_Call(__pyx_t_10, ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 34; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
+            __pyx_t_2 = PyObject_Call(__pyx_t_10, ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 50; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
             __Pyx_GOTREF(__pyx_t_2);
             __Pyx_DECREF(__pyx_t_10); __pyx_t_10 = 0;
-            if (PyObject_SetItem(((PyObject *)__pyx_v_self->weights), __pyx_t_2, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 34; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
+            if (PyObject_SetItem(((PyObject *)__pyx_v_self->weights), __pyx_t_2, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 50; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
             __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
             __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
           }
@@ -5321,7 +9519,7 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_4read_weights(struct __pyx_obj_5_cdec_
         __Pyx_XDECREF(__pyx_t_1); __pyx_t_1 = 0;
         __Pyx_XDECREF(__pyx_t_4); __pyx_t_4 = 0;
 
-        /* "_cdec.pyx":31
+        /* "_cdec.pyx":47
  * 
  *     def read_weights(self, cfg):
  *         with open(cfg) as fp:             # <<<<<<<<<<<<<<
@@ -5330,11 +9528,11 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_4read_weights(struct __pyx_obj_5_cdec_
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         /*except:*/ {
           __Pyx_AddTraceback("_cdec.Decoder.read_weights", __pyx_clineno, __pyx_lineno, __pyx_filename);
-          if (__Pyx_GetException(&__pyx_t_4, &__pyx_t_1, &__pyx_t_2) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L9_except_error;}
+          if (__Pyx_GetException(&__pyx_t_4, &__pyx_t_1, &__pyx_t_2) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 47; __pyx_clineno = __LINE__; goto __pyx_L9_except_error;}
           __Pyx_GOTREF(__pyx_t_4);
           __Pyx_GOTREF(__pyx_t_1);
           __Pyx_GOTREF(__pyx_t_2);
-          __pyx_t_10 = PyTuple_New(3); if (unlikely(!__pyx_t_10)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L9_except_error;}
+          __pyx_t_10 = PyTuple_New(3); if (unlikely(!__pyx_t_10)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 47; __pyx_clineno = __LINE__; goto __pyx_L9_except_error;}
           __Pyx_GOTREF(__pyx_t_10);
           __Pyx_INCREF(__pyx_t_4);
           PyTuple_SET_ITEM(__pyx_t_10, 0, __pyx_t_4);
@@ -5347,11 +9545,11 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_4read_weights(struct __pyx_obj_5_cdec_
           __Pyx_GIVEREF(__pyx_t_2);
           __pyx_t_15 = PyObject_Call(__pyx_t_3, __pyx_t_10, NULL);
           __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
-          if (unlikely(!__pyx_t_15)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L9_except_error;}
+          if (unlikely(!__pyx_t_15)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 47; __pyx_clineno = __LINE__; goto __pyx_L9_except_error;}
           __Pyx_GOTREF(__pyx_t_15);
           __pyx_t_14 = __Pyx_PyObject_IsTrue(__pyx_t_15);
           __Pyx_DECREF(__pyx_t_15); __pyx_t_15 = 0;
-          if (unlikely(__pyx_t_14 < 0)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L9_except_error;}
+          if (unlikely(__pyx_t_14 < 0)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 47; __pyx_clineno = __LINE__; goto __pyx_L9_except_error;}
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             __Pyx_GIVEREF(__pyx_t_4);
@@ -5359,7 +9557,7 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_4read_weights(struct __pyx_obj_5_cdec_
             __Pyx_GIVEREF(__pyx_t_2);
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-            {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L9_except_error;}
+            {__pyx_filename = __pyx_f[0]; __pyx_lineno = 47; __pyx_clineno = __LINE__; goto __pyx_L9_except_error;}
             goto __pyx_L22;
           }
           __pyx_L22:;
@@ -5385,13 +9583,13 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_4read_weights(struct __pyx_obj_5_cdec_
     }
     /*finally:*/ {
       if (__pyx_t_3) {
-        __pyx_t_7 = PyObject_Call(__pyx_t_3, __pyx_k_tuple_19, NULL);
+        __pyx_t_7 = PyObject_Call(__pyx_t_3, __pyx_k_tuple_38, NULL);
         __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
-        if (unlikely(!__pyx_t_7)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        if (unlikely(!__pyx_t_7)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 47; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
         __Pyx_GOTREF(__pyx_t_7);
         __pyx_t_16 = __Pyx_PyObject_IsTrue(__pyx_t_7);
         __Pyx_DECREF(__pyx_t_7); __pyx_t_7 = 0;
-        if (unlikely(__pyx_t_16 < 0)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        if (unlikely(__pyx_t_16 < 0)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 47; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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     goto __pyx_L23;
@@ -5433,7 +9631,7 @@ static PyObject *__pyx_pw_5_cdec_7Decoder_7translate(PyObject *__pyx_v_self, PyO
   {
     PyObject* values[2] = {0,0};
 
-    /* "_cdec.pyx":36
+    /* "_cdec.pyx":52
  *                 self.weights[fname.strip()] = float(value)
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  *     def translate(self, sentence, grammar=None):             # <<<<<<<<<<<<<<
@@ -5463,7 +9661,7 @@ static PyObject *__pyx_pw_5_cdec_7Decoder_7translate(PyObject *__pyx_v_self, PyO
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       }
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+  __Pyx_RaiseArgtupleInvalid("translate", 0, 1, 2, PyTuple_GET_SIZE(__pyx_args)); {__pyx_filename = __pyx_f[0]; __pyx_lineno = 52; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
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-  /* "_cdec.pyx":41
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-    /* "_cdec.pyx":42
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-    {__pyx_filename = __pyx_f[0]; __pyx_lineno = 44; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    {__pyx_filename = __pyx_f[0]; __pyx_lineno = 60; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  /* "_cdec.pyx":45
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+  __pyx_t_2 = __Pyx_PyObject_IsTrue(__pyx_v_grammar); if (unlikely(__pyx_t_2 < 0)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 61; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-    /* "_cdec.pyx":46
+    /* "_cdec.pyx":62
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+    __pyx_t_4 = PyBytes_AsString(__pyx_v_grammar); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 62; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  /* "_cdec.pyx":47
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-  /* "_cdec.pyx":48
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+  __pyx_t_4 = PyBytes_AsString(__pyx_v_inp); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 64; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  /* "_cdec.pyx":49
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-    /* "_cdec.pyx":50
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-  /* "_cdec.pyx":51
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+  __pyx_t_1 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_Hypergraph)), ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 67; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  /* "_cdec.pyx":52
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-  /* "_cdec.pyx":53
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-static int __pyx_pf_5_cdec_7Decoder_7weights_2__set__(struct __pyx_obj_5_cdec_Decoder *__pyx_v_self, PyObject *__pyx_v_value) {
-  int __pyx_r;
-  __Pyx_RefNannyDeclarations
-  int __pyx_lineno = 0;
-  const char *__pyx_filename = NULL;
-  int __pyx_clineno = 0;
-  __Pyx_RefNannySetupContext("__set__", 0);
-  if (!(likely(((__pyx_v_value) == Py_None) || likely(__Pyx_TypeTest(__pyx_v_value, __pyx_ptype_5_cdec_DenseVector))))) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 17; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __Pyx_INCREF(__pyx_v_value);
-  __Pyx_GIVEREF(__pyx_v_value);
-  __Pyx_GOTREF(__pyx_v_self->weights);
-  __Pyx_DECREF(((PyObject *)__pyx_v_self->weights));
-  __pyx_v_self->weights = ((struct __pyx_obj_5_cdec_DenseVector *)__pyx_v_value);
-
-  __pyx_r = 0;
-  goto __pyx_L0;
-  __pyx_L1_error:;
-  __Pyx_AddTraceback("_cdec.Decoder.weights.__set__", __pyx_clineno, __pyx_lineno, __pyx_filename);
-  __pyx_r = -1;
-  __pyx_L0:;
-  __Pyx_RefNannyFinishContext();
-  return __pyx_r;
-}
-
-/* Python wrapper */
-static int __pyx_pw_5_cdec_7Decoder_7weights_5__del__(PyObject *__pyx_v_self); /*proto*/
-static int __pyx_pw_5_cdec_7Decoder_7weights_5__del__(PyObject *__pyx_v_self) {
-  int __pyx_r;
-  __Pyx_RefNannyDeclarations
-  __Pyx_RefNannySetupContext("__del__ (wrapper)", 0);
-  __pyx_r = __pyx_pf_5_cdec_7Decoder_7weights_4__del__(((struct __pyx_obj_5_cdec_Decoder *)__pyx_v_self));
-  __Pyx_RefNannyFinishContext();
-  return __pyx_r;
-}
-
-static int __pyx_pf_5_cdec_7Decoder_7weights_4__del__(struct __pyx_obj_5_cdec_Decoder *__pyx_v_self) {
-  int __pyx_r;
-  __Pyx_RefNannyDeclarations
-  __Pyx_RefNannySetupContext("__del__", 0);
-  __Pyx_INCREF(Py_None);
-  __Pyx_GIVEREF(Py_None);
-  __Pyx_GOTREF(__pyx_v_self->weights);
-  __Pyx_DECREF(((PyObject *)__pyx_v_self->weights));
-  __pyx_v_self->weights = ((struct __pyx_obj_5_cdec_DenseVector *)Py_None);
-
-  __pyx_r = 0;
-  __Pyx_RefNannyFinishContext();
-  return __pyx_r;
-}
-
 static PyObject *__pyx_tp_new_5_cdec_DenseVector(PyTypeObject *t, PyObject *a, PyObject *k) {
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
@@ -5858,7 +9960,7 @@ static PyObject *__pyx_sq_item_5_cdec_DenseVector(PyObject *o, Py_ssize_t i) {
 
 static int __pyx_mp_ass_subscript_5_cdec_DenseVector(PyObject *o, PyObject *i, PyObject *v) {
   if (v) {
-    return __pyx_pw_5_cdec_11DenseVector_3__setitem__(o, i, v);
+    return __pyx_pw_5_cdec_11DenseVector_5__setitem__(o, i, v);
   }
   else {
     PyErr_Format(PyExc_NotImplementedError,
@@ -5868,8 +9970,8 @@ static int __pyx_mp_ass_subscript_5_cdec_DenseVector(PyObject *o, PyObject *i, P
 }
 
 static PyMethodDef __pyx_methods_5_cdec_DenseVector[] = {
-  {__Pyx_NAMESTR("dot"), (PyCFunction)__pyx_pw_5_cdec_11DenseVector_8dot, METH_O, __Pyx_DOCSTR(0)},
-  {__Pyx_NAMESTR("tosparse"), (PyCFunction)__pyx_pw_5_cdec_11DenseVector_10tosparse, METH_NOARGS, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("dot"), (PyCFunction)__pyx_pw_5_cdec_11DenseVector_10dot, METH_O, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("tosparse"), (PyCFunction)__pyx_pw_5_cdec_11DenseVector_12tosparse, METH_NOARGS, __Pyx_DOCSTR(0)},
   {0, 0, 0, 0}
 };
 
@@ -5932,7 +10034,7 @@ static PyNumberMethods __pyx_tp_as_number_DenseVector = {
 };
 
 static PySequenceMethods __pyx_tp_as_sequence_DenseVector = {
-  0, /*sq_length*/
+  __pyx_pw_5_cdec_11DenseVector_1__len__, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
   __pyx_sq_item_5_cdec_DenseVector, /*sq_item*/
@@ -5945,8 +10047,8 @@ static PySequenceMethods __pyx_tp_as_sequence_DenseVector = {
 };
 
 static PyMappingMethods __pyx_tp_as_mapping_DenseVector = {
-  0, /*mp_length*/
-  __pyx_pw_5_cdec_11DenseVector_1__getitem__, /*mp_subscript*/
+  __pyx_pw_5_cdec_11DenseVector_1__len__, /*mp_length*/
+  __pyx_pw_5_cdec_11DenseVector_3__getitem__, /*mp_subscript*/
   __pyx_mp_ass_subscript_5_cdec_DenseVector, /*mp_ass_subscript*/
 };
 
@@ -6001,7 +10103,7 @@ static PyTypeObject __pyx_type_5_cdec_DenseVector = {
   0, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
-  __pyx_pw_5_cdec_11DenseVector_5__iter__, /*tp_iter*/
+  __pyx_pw_5_cdec_11DenseVector_7__iter__, /*tp_iter*/
   0, /*tp_iternext*/
   __pyx_methods_5_cdec_DenseVector, /*tp_methods*/
   0, /*tp_members*/
@@ -6034,6 +10136,15 @@ static PyObject *__pyx_tp_new_5_cdec_SparseVector(PyTypeObject *t, PyObject *a,
 }
 
 static void __pyx_tp_dealloc_5_cdec_SparseVector(PyObject *o) {
+  {
+    PyObject *etype, *eval, *etb;
+    PyErr_Fetch(&etype, &eval, &etb);
+    ++Py_REFCNT(o);
+    __pyx_pw_5_cdec_12SparseVector_1__dealloc__(o);
+    if (PyErr_Occurred()) PyErr_WriteUnraisable(o);
+    --Py_REFCNT(o);
+    PyErr_Restore(etype, eval, etb);
+  }
   (*Py_TYPE(o)->tp_free)(o);
 }
 static PyObject *__pyx_sq_item_5_cdec_SparseVector(PyObject *o, Py_ssize_t i) {
@@ -6046,7 +10157,7 @@ static PyObject *__pyx_sq_item_5_cdec_SparseVector(PyObject *o, Py_ssize_t i) {
 
 static int __pyx_mp_ass_subscript_5_cdec_SparseVector(PyObject *o, PyObject *i, PyObject *v) {
   if (v) {
-    return __pyx_pw_5_cdec_12SparseVector_3__setitem__(o, i, v);
+    return __pyx_pw_5_cdec_12SparseVector_7__setitem__(o, i, v);
   }
   else {
     PyErr_Format(PyExc_NotImplementedError,
@@ -6056,22 +10167,22 @@ static int __pyx_mp_ass_subscript_5_cdec_SparseVector(PyObject *o, PyObject *i,
 }
 
 static PyMethodDef __pyx_methods_5_cdec_SparseVector[] = {
-  {__Pyx_NAMESTR("dot"), (PyCFunction)__pyx_pw_5_cdec_12SparseVector_8dot, METH_O, __Pyx_DOCSTR(0)},
-  {__Pyx_NAMESTR("todense"), (PyCFunction)__pyx_pw_5_cdec_12SparseVector_10todense, METH_NOARGS, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("copy"), (PyCFunction)__pyx_pw_5_cdec_12SparseVector_3copy, METH_NOARGS, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("dot"), (PyCFunction)__pyx_pw_5_cdec_12SparseVector_12dot, METH_O, __Pyx_DOCSTR(0)},
   {0, 0, 0, 0}
 };
 
 static PyNumberMethods __pyx_tp_as_number_SparseVector = {
-  __pyx_pw_5_cdec_12SparseVector_26__add__, /*nb_add*/
-  __pyx_pw_5_cdec_12SparseVector_28__sub__, /*nb_subtract*/
-  0, /*nb_multiply*/
+  __pyx_pw_5_cdec_12SparseVector_30__add__, /*nb_add*/
+  __pyx_pw_5_cdec_12SparseVector_32__sub__, /*nb_subtract*/
+  __pyx_pw_5_cdec_12SparseVector_34__mul__, /*nb_multiply*/
   #if PY_MAJOR_VERSION < 3
-  0, /*nb_divide*/
+  __pyx_pw_5_cdec_12SparseVector_36__div__, /*nb_divide*/
   #endif
   0, /*nb_remainder*/
   0, /*nb_divmod*/
   0, /*nb_power*/
-  0, /*nb_negative*/
+  __pyx_pw_5_cdec_12SparseVector_20__neg__, /*nb_negative*/
   0, /*nb_positive*/
   0, /*nb_absolute*/
   0, /*nb_nonzero*/
@@ -6097,11 +10208,11 @@ static PyNumberMethods __pyx_tp_as_number_SparseVector = {
   #if PY_MAJOR_VERSION < 3
   0, /*nb_hex*/
   #endif
-  __pyx_pw_5_cdec_12SparseVector_18__iadd__, /*nb_inplace_add*/
-  __pyx_pw_5_cdec_12SparseVector_20__isub__, /*nb_inplace_subtract*/
-  __pyx_pw_5_cdec_12SparseVector_22__imul__, /*nb_inplace_multiply*/
+  __pyx_pw_5_cdec_12SparseVector_22__iadd__, /*nb_inplace_add*/
+  __pyx_pw_5_cdec_12SparseVector_24__isub__, /*nb_inplace_subtract*/
+  __pyx_pw_5_cdec_12SparseVector_26__imul__, /*nb_inplace_multiply*/
   #if PY_MAJOR_VERSION < 3
-  __pyx_pw_5_cdec_12SparseVector_24__idiv__, /*nb_inplace_divide*/
+  __pyx_pw_5_cdec_12SparseVector_28__idiv__, /*nb_inplace_divide*/
   #endif
   0, /*nb_inplace_remainder*/
   0, /*nb_inplace_power*/
@@ -6120,21 +10231,21 @@ static PyNumberMethods __pyx_tp_as_number_SparseVector = {
 };
 
 static PySequenceMethods __pyx_tp_as_sequence_SparseVector = {
-  __pyx_pw_5_cdec_12SparseVector_14__len__, /*sq_length*/
+  __pyx_pw_5_cdec_12SparseVector_16__len__, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
   __pyx_sq_item_5_cdec_SparseVector, /*sq_item*/
   0, /*sq_slice*/
   0, /*sq_ass_item*/
   0, /*sq_ass_slice*/
-  __pyx_pw_5_cdec_12SparseVector_16__contains__, /*sq_contains*/
+  __pyx_pw_5_cdec_12SparseVector_18__contains__, /*sq_contains*/
   0, /*sq_inplace_concat*/
   0, /*sq_inplace_repeat*/
 };
 
 static PyMappingMethods __pyx_tp_as_mapping_SparseVector = {
-  __pyx_pw_5_cdec_12SparseVector_14__len__, /*mp_length*/
-  __pyx_pw_5_cdec_12SparseVector_1__getitem__, /*mp_subscript*/
+  __pyx_pw_5_cdec_12SparseVector_16__len__, /*mp_length*/
+  __pyx_pw_5_cdec_12SparseVector_5__getitem__, /*mp_subscript*/
   __pyx_mp_ass_subscript_5_cdec_SparseVector, /*mp_ass_subscript*/
 };
 
@@ -6187,9 +10298,9 @@ static PyTypeObject __pyx_type_5_cdec_SparseVector = {
   0, /*tp_doc*/
   0, /*tp_traverse*/
   0, /*tp_clear*/
-  __pyx_pw_5_cdec_12SparseVector_12__richcmp__, /*tp_richcompare*/
+  __pyx_pw_5_cdec_12SparseVector_14__richcmp__, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
-  __pyx_pw_5_cdec_12SparseVector_5__iter__, /*tp_iter*/
+  __pyx_pw_5_cdec_12SparseVector_9__iter__, /*tp_iter*/
   0, /*tp_iternext*/
   __pyx_methods_5_cdec_SparseVector, /*tp_methods*/
   0, /*tp_members*/
@@ -6241,11 +10352,12 @@ static PyMethodDef __pyx_methods_5_cdec_Hypergraph[] = {
   {__Pyx_NAMESTR("viterbi_features"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_9viterbi_features, METH_NOARGS, __Pyx_DOCSTR(0)},
   {__Pyx_NAMESTR("kbest"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_11kbest, METH_O, __Pyx_DOCSTR(0)},
   {__Pyx_NAMESTR("kbest_tree"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_14kbest_tree, METH_O, __Pyx_DOCSTR(0)},
-  {__Pyx_NAMESTR("sample"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_17sample, METH_O, __Pyx_DOCSTR(0)},
-  {__Pyx_NAMESTR("intersect"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_20intersect, METH_O, __Pyx_DOCSTR(0)},
-  {__Pyx_NAMESTR("prune"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_22prune, METH_VARARGS|METH_KEYWORDS, __Pyx_DOCSTR(0)},
-  {__Pyx_NAMESTR("lattice"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_24lattice, METH_NOARGS, __Pyx_DOCSTR(0)},
-  {__Pyx_NAMESTR("reweight"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_26reweight, METH_O, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("kbest_features"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_17kbest_features, METH_O, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("sample"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_20sample, METH_O, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("intersect"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_23intersect, METH_O, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("prune"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_25prune, METH_VARARGS|METH_KEYWORDS, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("lattice"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_27lattice, METH_NOARGS, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("reweight"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_29reweight, METH_O, __Pyx_DOCSTR(0)},
   {0, 0, 0, 0}
 };
 
@@ -6441,6 +10553,7 @@ static int __pyx_mp_ass_subscript_5_cdec_Lattice(PyObject *o, PyObject *i, PyObj
 }
 
 static PyMethodDef __pyx_methods_5_cdec_Lattice[] = {
+  {__Pyx_NAMESTR("todot"), (PyCFunction)__pyx_pw_5_cdec_7Lattice_16todot, METH_NOARGS, __Pyx_DOCSTR(0)},
   {0, 0, 0, 0}
 };
 
@@ -6598,6 +10711,941 @@ static PyTypeObject __pyx_type_5_cdec_Lattice = {
   #endif
 };
 
+static PyObject *__pyx_tp_new_5_cdec_Candidate(PyTypeObject *t, PyObject *a, PyObject *k) {
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  return o;
+}
+
+static void __pyx_tp_dealloc_5_cdec_Candidate(PyObject *o) {
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static PyObject *__pyx_getprop_5_cdec_9Candidate_words(PyObject *o, void *x) {
+  return __pyx_pw_5_cdec_9Candidate_5words_1__get__(o);
+}
+
+static PyObject *__pyx_getprop_5_cdec_9Candidate_fmap(PyObject *o, void *x) {
+  return __pyx_pw_5_cdec_9Candidate_4fmap_1__get__(o);
+}
+
+static PyObject *__pyx_getprop_5_cdec_9Candidate_score(PyObject *o, void *x) {
+  return __pyx_pw_5_cdec_9Candidate_5score_1__get__(o);
+}
+
+static int __pyx_setprop_5_cdec_9Candidate_score(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pw_5_cdec_9Candidate_5score_3__set__(o, v);
+  }
+  else {
+    PyErr_SetString(PyExc_NotImplementedError, "__del__");
+    return -1;
+  }
+}
+
+static PyMethodDef __pyx_methods_5_cdec_Candidate[] = {
+  {0, 0, 0, 0}
+};
+
+static struct PyGetSetDef __pyx_getsets_5_cdec_Candidate[] = {
+  {(char *)"words", __pyx_getprop_5_cdec_9Candidate_words, 0, 0, 0},
+  {(char *)"fmap", __pyx_getprop_5_cdec_9Candidate_fmap, 0, 0, 0},
+  {(char *)"score", __pyx_getprop_5_cdec_9Candidate_score, __pyx_setprop_5_cdec_9Candidate_score, 0, 0},
+  {0, 0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number_Candidate = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_long*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if PY_VERSION_HEX >= 0x02050000
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence_Candidate = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping_Candidate = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer_Candidate = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+static PyTypeObject __pyx_type_5_cdec_Candidate = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("_cdec.Candidate"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec_Candidate), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_5_cdec_Candidate, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*tp_compare*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number_Candidate, /*tp_as_number*/
+  &__pyx_tp_as_sequence_Candidate, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping_Candidate, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer_Candidate, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_BASETYPE, /*tp_flags*/
+  0, /*tp_doc*/
+  0, /*tp_traverse*/
+  0, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_5_cdec_Candidate, /*tp_methods*/
+  0, /*tp_members*/
+  __pyx_getsets_5_cdec_Candidate, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_5_cdec_Candidate, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+
+static PyObject *__pyx_tp_new_5_cdec_SufficientStats(PyTypeObject *t, PyObject *a, PyObject *k) {
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  return o;
+}
+
+static void __pyx_tp_dealloc_5_cdec_SufficientStats(PyObject *o) {
+  {
+    PyObject *etype, *eval, *etb;
+    PyErr_Fetch(&etype, &eval, &etb);
+    ++Py_REFCNT(o);
+    __pyx_pw_5_cdec_15SufficientStats_1__dealloc__(o);
+    if (PyErr_Occurred()) PyErr_WriteUnraisable(o);
+    --Py_REFCNT(o);
+    PyErr_Restore(etype, eval, etb);
+  }
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static PyObject *__pyx_getprop_5_cdec_15SufficientStats_score(PyObject *o, void *x) {
+  return __pyx_pw_5_cdec_15SufficientStats_5score_1__get__(o);
+}
+
+static PyObject *__pyx_getprop_5_cdec_15SufficientStats_detail(PyObject *o, void *x) {
+  return __pyx_pw_5_cdec_15SufficientStats_6detail_1__get__(o);
+}
+
+static PyMethodDef __pyx_methods_5_cdec_SufficientStats[] = {
+  {0, 0, 0, 0}
+};
+
+static struct PyGetSetDef __pyx_getsets_5_cdec_SufficientStats[] = {
+  {(char *)"score", __pyx_getprop_5_cdec_15SufficientStats_score, 0, 0, 0},
+  {(char *)"detail", __pyx_getprop_5_cdec_15SufficientStats_detail, 0, 0, 0},
+  {0, 0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number_SufficientStats = {
+  __pyx_pw_5_cdec_15SufficientStats_10__add__, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_long*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  __pyx_pw_5_cdec_15SufficientStats_8__iadd__, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if PY_VERSION_HEX >= 0x02050000
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence_SufficientStats = {
+  __pyx_pw_5_cdec_15SufficientStats_3__len__, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping_SufficientStats = {
+  __pyx_pw_5_cdec_15SufficientStats_3__len__, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer_SufficientStats = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+static PyTypeObject __pyx_type_5_cdec_SufficientStats = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("_cdec.SufficientStats"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec_SufficientStats), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_5_cdec_SufficientStats, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*tp_compare*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number_SufficientStats, /*tp_as_number*/
+  &__pyx_tp_as_sequence_SufficientStats, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping_SufficientStats, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer_SufficientStats, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_BASETYPE, /*tp_flags*/
+  0, /*tp_doc*/
+  0, /*tp_traverse*/
+  0, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  __pyx_pw_5_cdec_15SufficientStats_5__iter__, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_5_cdec_SufficientStats, /*tp_methods*/
+  0, /*tp_members*/
+  __pyx_getsets_5_cdec_SufficientStats, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_5_cdec_SufficientStats, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+
+static PyObject *__pyx_tp_new_5_cdec_CandidateSet(PyTypeObject *t, PyObject *a, PyObject *k) {
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  if (__pyx_pw_5_cdec_12CandidateSet_1__cinit__(o, a, k) < 0) {
+    Py_DECREF(o); o = 0;
+  }
+  return o;
+}
+
+static void __pyx_tp_dealloc_5_cdec_CandidateSet(PyObject *o) {
+  {
+    PyObject *etype, *eval, *etb;
+    PyErr_Fetch(&etype, &eval, &etb);
+    ++Py_REFCNT(o);
+    __pyx_pw_5_cdec_12CandidateSet_3__dealloc__(o);
+    if (PyErr_Occurred()) PyErr_WriteUnraisable(o);
+    --Py_REFCNT(o);
+    PyErr_Restore(etype, eval, etb);
+  }
+  (*Py_TYPE(o)->tp_free)(o);
+}
+static PyObject *__pyx_sq_item_5_cdec_CandidateSet(PyObject *o, Py_ssize_t i) {
+  PyObject *r;
+  PyObject *x = PyInt_FromSsize_t(i); if(!x) return 0;
+  r = Py_TYPE(o)->tp_as_mapping->mp_subscript(o, x);
+  Py_DECREF(x);
+  return r;
+}
+
+static PyMethodDef __pyx_methods_5_cdec_CandidateSet[] = {
+  {__Pyx_NAMESTR("add_kbest"), (PyCFunction)__pyx_pw_5_cdec_12CandidateSet_12add_kbest, METH_VARARGS|METH_KEYWORDS, __Pyx_DOCSTR(0)},
+  {0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number_CandidateSet = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_long*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if PY_VERSION_HEX >= 0x02050000
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence_CandidateSet = {
+  __pyx_pw_5_cdec_12CandidateSet_5__len__, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  __pyx_sq_item_5_cdec_CandidateSet, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping_CandidateSet = {
+  __pyx_pw_5_cdec_12CandidateSet_5__len__, /*mp_length*/
+  __pyx_pw_5_cdec_12CandidateSet_7__getitem__, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer_CandidateSet = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+static PyTypeObject __pyx_type_5_cdec_CandidateSet = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("_cdec.CandidateSet"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec_CandidateSet), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_5_cdec_CandidateSet, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*tp_compare*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number_CandidateSet, /*tp_as_number*/
+  &__pyx_tp_as_sequence_CandidateSet, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping_CandidateSet, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer_CandidateSet, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_BASETYPE, /*tp_flags*/
+  0, /*tp_doc*/
+  0, /*tp_traverse*/
+  0, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  __pyx_pw_5_cdec_12CandidateSet_9__iter__, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_5_cdec_CandidateSet, /*tp_methods*/
+  0, /*tp_members*/
+  0, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_5_cdec_CandidateSet, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+
+static PyObject *__pyx_tp_new_5_cdec_SegmentEvaluator(PyTypeObject *t, PyObject *a, PyObject *k) {
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  return o;
+}
+
+static void __pyx_tp_dealloc_5_cdec_SegmentEvaluator(PyObject *o) {
+  {
+    PyObject *etype, *eval, *etb;
+    PyErr_Fetch(&etype, &eval, &etb);
+    ++Py_REFCNT(o);
+    __pyx_pw_5_cdec_16SegmentEvaluator_1__dealloc__(o);
+    if (PyErr_Occurred()) PyErr_WriteUnraisable(o);
+    --Py_REFCNT(o);
+    PyErr_Restore(etype, eval, etb);
+  }
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static PyMethodDef __pyx_methods_5_cdec_SegmentEvaluator[] = {
+  {__Pyx_NAMESTR("evaluate"), (PyCFunction)__pyx_pw_5_cdec_16SegmentEvaluator_3evaluate, METH_O, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("candidate_set"), (PyCFunction)__pyx_pw_5_cdec_16SegmentEvaluator_5candidate_set, METH_NOARGS, __Pyx_DOCSTR(0)},
+  {0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number_SegmentEvaluator = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_long*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if PY_VERSION_HEX >= 0x02050000
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence_SegmentEvaluator = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping_SegmentEvaluator = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer_SegmentEvaluator = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+static PyTypeObject __pyx_type_5_cdec_SegmentEvaluator = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("_cdec.SegmentEvaluator"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec_SegmentEvaluator), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_5_cdec_SegmentEvaluator, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*tp_compare*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number_SegmentEvaluator, /*tp_as_number*/
+  &__pyx_tp_as_sequence_SegmentEvaluator, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping_SegmentEvaluator, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer_SegmentEvaluator, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_BASETYPE, /*tp_flags*/
+  0, /*tp_doc*/
+  0, /*tp_traverse*/
+  0, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_5_cdec_SegmentEvaluator, /*tp_methods*/
+  0, /*tp_members*/
+  0, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_5_cdec_SegmentEvaluator, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+
+static PyObject *__pyx_tp_new_5_cdec_Scorer(PyTypeObject *t, PyObject *a, PyObject *k) {
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  if (__pyx_pw_5_cdec_6Scorer_1__cinit__(o, a, k) < 0) {
+    Py_DECREF(o); o = 0;
+  }
+  return o;
+}
+
+static void __pyx_tp_dealloc_5_cdec_Scorer(PyObject *o) {
+  {
+    PyObject *etype, *eval, *etb;
+    PyErr_Fetch(&etype, &eval, &etb);
+    ++Py_REFCNT(o);
+    __pyx_pw_5_cdec_6Scorer_3__dealloc__(o);
+    if (PyErr_Occurred()) PyErr_WriteUnraisable(o);
+    --Py_REFCNT(o);
+    PyErr_Restore(etype, eval, etb);
+  }
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static PyMethodDef __pyx_methods_5_cdec_Scorer[] = {
+  {0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number_Scorer = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_long*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if PY_VERSION_HEX >= 0x02050000
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence_Scorer = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping_Scorer = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer_Scorer = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+static PyTypeObject __pyx_type_5_cdec_Scorer = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("_cdec.Scorer"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec_Scorer), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_5_cdec_Scorer, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*tp_compare*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number_Scorer, /*tp_as_number*/
+  &__pyx_tp_as_sequence_Scorer, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping_Scorer, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  __pyx_pw_5_cdec_6Scorer_5__call__, /*tp_call*/
+  __pyx_pw_5_cdec_6Scorer_7__str__, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer_Scorer, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_BASETYPE, /*tp_flags*/
+  0, /*tp_doc*/
+  0, /*tp_traverse*/
+  0, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_5_cdec_Scorer, /*tp_methods*/
+  0, /*tp_members*/
+  0, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_5_cdec_Scorer, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+
 static PyObject *__pyx_tp_new_5_cdec_Decoder(PyTypeObject *t, PyObject *a, PyObject *k) {
   struct __pyx_obj_5_cdec_Decoder *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
@@ -6652,7 +11700,8 @@ static int __pyx_setprop_5_cdec_7Decoder_weights(PyObject *o, PyObject *v, void
     return __pyx_pw_5_cdec_7Decoder_7weights_3__set__(o, v);
   }
   else {
-    return __pyx_pw_5_cdec_7Decoder_7weights_5__del__(o);
+    PyErr_SetString(PyExc_NotImplementedError, "__del__");
+    return -1;
   }
 }
 
@@ -7017,14 +12066,12 @@ static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_1___iter__(PyTypeObject
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
   p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_1___iter__ *)o);
-  p->__pyx_v_fname = 0;
   p->__pyx_v_self = 0;
   return o;
 }
 
 static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_1___iter__(PyObject *o) {
   struct __pyx_obj_5_cdec___pyx_scope_struct_1___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_1___iter__ *)o;
-  Py_XDECREF(((PyObject *)p->__pyx_v_fname));
   Py_XDECREF(((PyObject *)p->__pyx_v_self));
   (*Py_TYPE(o)->tp_free)(o);
 }
@@ -7032,9 +12079,6 @@ static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_1___iter__(PyObject *o) {
 static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_1___iter__(PyObject *o, visitproc v, void *a) {
   int e;
   struct __pyx_obj_5_cdec___pyx_scope_struct_1___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_1___iter__ *)o;
-  if (p->__pyx_v_fname) {
-    e = (*v)(p->__pyx_v_fname, a); if (e) return e;
-  }
   if (p->__pyx_v_self) {
     e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
   }
@@ -7044,9 +12088,6 @@ static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_1___iter__(PyObject *o, v
 static int __pyx_tp_clear_5_cdec___pyx_scope_struct_1___iter__(PyObject *o) {
   struct __pyx_obj_5_cdec___pyx_scope_struct_1___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_1___iter__ *)o;
   PyObject* tmp;
-  tmp = ((PyObject*)p->__pyx_v_fname);
-  p->__pyx_v_fname = ((PyObject*)Py_None); Py_INCREF(Py_None);
-  Py_XDECREF(tmp);
   tmp = ((PyObject*)p->__pyx_v_self);
   p->__pyx_v_self = ((struct __pyx_obj_5_cdec_SparseVector *)Py_None); Py_INCREF(Py_None);
   Py_XDECREF(tmp);
@@ -7625,26 +12666,233 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_3_kbest_tree = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_4_sample(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_4_sample *p;
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_4_kbest_features(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features *p;
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features *)o);
+  p->__pyx_v_fmap = 0;
+  p->__pyx_v_self = 0;
+  p->__pyx_v_size = 0;
+  return o;
+}
+
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_4_kbest_features(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features *)o;
+  Py_XDECREF(((PyObject *)p->__pyx_v_fmap));
+  Py_XDECREF(((PyObject *)p->__pyx_v_self));
+  Py_XDECREF(p->__pyx_v_size);
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_4_kbest_features(PyObject *o, visitproc v, void *a) {
+  int e;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features *)o;
+  if (p->__pyx_v_fmap) {
+    e = (*v)(((PyObject*)p->__pyx_v_fmap), a); if (e) return e;
+  }
+  if (p->__pyx_v_self) {
+    e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
+  }
+  if (p->__pyx_v_size) {
+    e = (*v)(p->__pyx_v_size, a); if (e) return e;
+  }
+  return 0;
+}
+
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_4_kbest_features(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features *)o;
+  PyObject* tmp;
+  tmp = ((PyObject*)p->__pyx_v_fmap);
+  p->__pyx_v_fmap = ((struct __pyx_obj_5_cdec_SparseVector *)Py_None); Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->__pyx_v_self);
+  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_Hypergraph *)Py_None); Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->__pyx_v_size);
+  p->__pyx_v_size = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  return 0;
+}
+
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_4_kbest_features[] = {
+  {0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_4_kbest_features = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_long*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if PY_VERSION_HEX >= 0x02050000
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_4_kbest_features = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_4_kbest_features = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_4_kbest_features = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_4_kbest_features = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_4_kbest_features"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_4_kbest_features, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*tp_compare*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number___pyx_scope_struct_4_kbest_features, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_4_kbest_features, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_4_kbest_features, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_4_kbest_features, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
+  0, /*tp_doc*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_4_kbest_features, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_4_kbest_features, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_5_cdec___pyx_scope_struct_4_kbest_features, /*tp_methods*/
+  0, /*tp_members*/
+  0, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_4_kbest_features, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_5_sample(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
-  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_4_sample *)o);
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *)o);
   p->__pyx_v_self = 0;
   p->__pyx_v_sentence = 0;
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_4_sample(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_4_sample *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_4_sample *)o;
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_5_sample(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *)o;
   Py_XDECREF(((PyObject *)p->__pyx_v_self));
   Py_XDECREF(((PyObject *)p->__pyx_v_sentence));
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_4_sample(PyObject *o, visitproc v, void *a) {
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_5_sample(PyObject *o, visitproc v, void *a) {
   int e;
-  struct __pyx_obj_5_cdec___pyx_scope_struct_4_sample *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_4_sample *)o;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *)o;
   if (p->__pyx_v_self) {
     e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
   }
@@ -7654,8 +12902,8 @@ static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_4_sample(PyObject *o, vis
   return 0;
 }
 
-static int __pyx_tp_clear_5_cdec___pyx_scope_struct_4_sample(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_4_sample *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_4_sample *)o;
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_5_sample(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *)o;
   PyObject* tmp;
   tmp = ((PyObject*)p->__pyx_v_self);
   p->__pyx_v_self = ((struct __pyx_obj_5_cdec_Hypergraph *)Py_None); Py_INCREF(Py_None);
@@ -7666,11 +12914,11 @@ static int __pyx_tp_clear_5_cdec___pyx_scope_struct_4_sample(PyObject *o) {
   return 0;
 }
 
-static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_4_sample[] = {
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_5_sample[] = {
   {0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_4_sample = {
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_5_sample = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -7728,7 +12976,7 @@ static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_4_sample = {
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_4_sample = {
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_5_sample = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -7741,13 +12989,13 @@ static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_4_sample = {
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_4_sample = {
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_5_sample = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_4_sample = {
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_5_sample = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -7768,12 +13016,12 @@ static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_4_sample = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_4_sample = {
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_5_sample = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_4_sample"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_4_sample), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_5_sample"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_4_sample, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_5_sample, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -7783,24 +13031,24 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_4_sample = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number___pyx_scope_struct_4_sample, /*tp_as_number*/
-  &__pyx_tp_as_sequence___pyx_scope_struct_4_sample, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping___pyx_scope_struct_4_sample, /*tp_as_mapping*/
+  &__pyx_tp_as_number___pyx_scope_struct_5_sample, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_5_sample, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_5_sample, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
   0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer___pyx_scope_struct_4_sample, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_5_sample, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
   0, /*tp_doc*/
-  __pyx_tp_traverse_5_cdec___pyx_scope_struct_4_sample, /*tp_traverse*/
-  __pyx_tp_clear_5_cdec___pyx_scope_struct_4_sample, /*tp_clear*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_5_sample, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_5_sample, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec___pyx_scope_struct_4_sample, /*tp_methods*/
+  __pyx_methods_5_cdec___pyx_scope_struct_5_sample, /*tp_methods*/
   0, /*tp_members*/
   0, /*tp_getset*/
   0, /*tp_base*/
@@ -7810,7 +13058,7 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_4_sample = {
   0, /*tp_dictoffset*/
   0, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec___pyx_scope_struct_4_sample, /*tp_new*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_5_sample, /*tp_new*/
   0, /*tp_free*/
   0, /*tp_is_gc*/
   0, /*tp_bases*/
@@ -7824,32 +13072,32 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_4_sample = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_5___iter__(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_5___iter__ *p;
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_6___iter__(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_6___iter__ *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
-  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_5___iter__ *)o);
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_6___iter__ *)o);
   p->__pyx_v_self = 0;
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_5___iter__(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_5___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_5___iter__ *)o;
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_6___iter__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_6___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_6___iter__ *)o;
   Py_XDECREF(((PyObject *)p->__pyx_v_self));
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_5___iter__(PyObject *o, visitproc v, void *a) {
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_6___iter__(PyObject *o, visitproc v, void *a) {
   int e;
-  struct __pyx_obj_5_cdec___pyx_scope_struct_5___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_5___iter__ *)o;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_6___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_6___iter__ *)o;
   if (p->__pyx_v_self) {
     e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
   }
   return 0;
 }
 
-static int __pyx_tp_clear_5_cdec___pyx_scope_struct_5___iter__(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_5___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_5___iter__ *)o;
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_6___iter__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_6___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_6___iter__ *)o;
   PyObject* tmp;
   tmp = ((PyObject*)p->__pyx_v_self);
   p->__pyx_v_self = ((struct __pyx_obj_5_cdec_Lattice *)Py_None); Py_INCREF(Py_None);
@@ -7857,11 +13105,648 @@ static int __pyx_tp_clear_5_cdec___pyx_scope_struct_5___iter__(PyObject *o) {
   return 0;
 }
 
-static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_5___iter__[] = {
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_6___iter__[] = {
+  {0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_6___iter__ = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_long*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if PY_VERSION_HEX >= 0x02050000
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_6___iter__ = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_6___iter__ = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_6___iter__ = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_6___iter__ = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_6___iter__"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_6___iter__), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_6___iter__, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*tp_compare*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number___pyx_scope_struct_6___iter__, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_6___iter__, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_6___iter__, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_6___iter__, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
+  0, /*tp_doc*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_6___iter__, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_6___iter__, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_5_cdec___pyx_scope_struct_6___iter__, /*tp_methods*/
+  0, /*tp_members*/
+  0, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_6___iter__, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_7_todot(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_7_todot *p;
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_7_todot *)o);
+  p->__pyx_v_self = 0;
+  return o;
+}
+
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_7_todot(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_7_todot *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_7_todot *)o;
+  Py_XDECREF(((PyObject *)p->__pyx_v_self));
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_7_todot(PyObject *o, visitproc v, void *a) {
+  int e;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_7_todot *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_7_todot *)o;
+  if (p->__pyx_v_self) {
+    e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
+  }
+  return 0;
+}
+
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_7_todot(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_7_todot *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_7_todot *)o;
+  PyObject* tmp;
+  tmp = ((PyObject*)p->__pyx_v_self);
+  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_Lattice *)Py_None); Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  return 0;
+}
+
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_7_todot[] = {
+  {0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_7_todot = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_long*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if PY_VERSION_HEX >= 0x02050000
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_7_todot = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_7_todot = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_7_todot = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_7_todot = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_7_todot"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_7_todot), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_7_todot, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*tp_compare*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number___pyx_scope_struct_7_todot, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_7_todot, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_7_todot, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_7_todot, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
+  0, /*tp_doc*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_7_todot, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_7_todot, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_5_cdec___pyx_scope_struct_7_todot, /*tp_methods*/
+  0, /*tp_members*/
+  0, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_7_todot, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_8_lines(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_8_lines *p;
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_8_lines *)o);
+  p->__pyx_outer_scope = 0;
+  p->__pyx_v_delta = 0;
+  p->__pyx_v_i = 0;
+  p->__pyx_v_label = 0;
+  p->__pyx_v_weight = 0;
+  p->__pyx_t_1 = 0;
+  p->__pyx_t_3 = 0;
+  return o;
+}
+
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_8_lines(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_8_lines *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_8_lines *)o;
+  Py_XDECREF(((PyObject *)p->__pyx_outer_scope));
+  Py_XDECREF(p->__pyx_v_delta);
+  Py_XDECREF(p->__pyx_v_i);
+  Py_XDECREF(p->__pyx_v_label);
+  Py_XDECREF(p->__pyx_v_weight);
+  Py_XDECREF(p->__pyx_t_1);
+  Py_XDECREF(p->__pyx_t_3);
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_8_lines(PyObject *o, visitproc v, void *a) {
+  int e;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_8_lines *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_8_lines *)o;
+  if (p->__pyx_outer_scope) {
+    e = (*v)(((PyObject*)p->__pyx_outer_scope), a); if (e) return e;
+  }
+  if (p->__pyx_v_delta) {
+    e = (*v)(p->__pyx_v_delta, a); if (e) return e;
+  }
+  if (p->__pyx_v_i) {
+    e = (*v)(p->__pyx_v_i, a); if (e) return e;
+  }
+  if (p->__pyx_v_label) {
+    e = (*v)(p->__pyx_v_label, a); if (e) return e;
+  }
+  if (p->__pyx_v_weight) {
+    e = (*v)(p->__pyx_v_weight, a); if (e) return e;
+  }
+  if (p->__pyx_t_1) {
+    e = (*v)(p->__pyx_t_1, a); if (e) return e;
+  }
+  if (p->__pyx_t_3) {
+    e = (*v)(p->__pyx_t_3, a); if (e) return e;
+  }
+  return 0;
+}
+
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_8_lines(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_8_lines *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_8_lines *)o;
+  PyObject* tmp;
+  tmp = ((PyObject*)p->__pyx_outer_scope);
+  p->__pyx_outer_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_7_todot *)Py_None); Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->__pyx_v_delta);
+  p->__pyx_v_delta = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->__pyx_v_i);
+  p->__pyx_v_i = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->__pyx_v_label);
+  p->__pyx_v_label = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->__pyx_v_weight);
+  p->__pyx_v_weight = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->__pyx_t_1);
+  p->__pyx_t_1 = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->__pyx_t_3);
+  p->__pyx_t_3 = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  return 0;
+}
+
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_8_lines[] = {
+  {0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_8_lines = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_long*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if PY_VERSION_HEX >= 0x02050000
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_8_lines = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_8_lines = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_8_lines = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_8_lines = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_8_lines"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_8_lines), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_8_lines, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*tp_compare*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number___pyx_scope_struct_8_lines, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_8_lines, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_8_lines, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_8_lines, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
+  0, /*tp_doc*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_8_lines, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_8_lines, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_5_cdec___pyx_scope_struct_8_lines, /*tp_methods*/
+  0, /*tp_members*/
+  0, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_8_lines, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_9___iter__(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_9___iter__ *p;
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_9___iter__ *)o);
+  p->__pyx_v_i = 0;
+  p->__pyx_v_self = 0;
+  p->__pyx_t_1 = 0;
+  return o;
+}
+
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_9___iter__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_9___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_9___iter__ *)o;
+  Py_XDECREF(p->__pyx_v_i);
+  Py_XDECREF(((PyObject *)p->__pyx_v_self));
+  Py_XDECREF(p->__pyx_t_1);
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_9___iter__(PyObject *o, visitproc v, void *a) {
+  int e;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_9___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_9___iter__ *)o;
+  if (p->__pyx_v_i) {
+    e = (*v)(p->__pyx_v_i, a); if (e) return e;
+  }
+  if (p->__pyx_v_self) {
+    e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
+  }
+  if (p->__pyx_t_1) {
+    e = (*v)(p->__pyx_t_1, a); if (e) return e;
+  }
+  return 0;
+}
+
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_9___iter__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_9___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_9___iter__ *)o;
+  PyObject* tmp;
+  tmp = ((PyObject*)p->__pyx_v_i);
+  p->__pyx_v_i = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->__pyx_v_self);
+  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_SufficientStats *)Py_None); Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->__pyx_t_1);
+  p->__pyx_t_1 = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  return 0;
+}
+
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_9___iter__[] = {
   {0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_5___iter__ = {
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_9___iter__ = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -7919,7 +13804,7 @@ static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_5___iter__ = {
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_5___iter__ = {
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_9___iter__ = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -7932,13 +13817,13 @@ static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_5___iter__ = {
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_5___iter__ = {
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_9___iter__ = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_5___iter__ = {
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_9___iter__ = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -7959,12 +13844,12 @@ static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_5___iter__ = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_5___iter__ = {
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_9___iter__ = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_5___iter__"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_5___iter__), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_9___iter__"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_9___iter__), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_5___iter__, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_9___iter__, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -7974,24 +13859,24 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_5___iter__ = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number___pyx_scope_struct_5___iter__, /*tp_as_number*/
-  &__pyx_tp_as_sequence___pyx_scope_struct_5___iter__, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping___pyx_scope_struct_5___iter__, /*tp_as_mapping*/
+  &__pyx_tp_as_number___pyx_scope_struct_9___iter__, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_9___iter__, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_9___iter__, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
   0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer___pyx_scope_struct_5___iter__, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_9___iter__, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
   0, /*tp_doc*/
-  __pyx_tp_traverse_5_cdec___pyx_scope_struct_5___iter__, /*tp_traverse*/
-  __pyx_tp_clear_5_cdec___pyx_scope_struct_5___iter__, /*tp_clear*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_9___iter__, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_9___iter__, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec___pyx_scope_struct_5___iter__, /*tp_methods*/
+  __pyx_methods_5_cdec___pyx_scope_struct_9___iter__, /*tp_methods*/
   0, /*tp_members*/
   0, /*tp_getset*/
   0, /*tp_base*/
@@ -8001,7 +13886,198 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_5___iter__ = {
   0, /*tp_dictoffset*/
   0, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec___pyx_scope_struct_5___iter__, /*tp_new*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_9___iter__, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_10___iter__(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_10___iter__ *p;
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_10___iter__ *)o);
+  p->__pyx_v_self = 0;
+  return o;
+}
+
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_10___iter__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_10___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_10___iter__ *)o;
+  Py_XDECREF(((PyObject *)p->__pyx_v_self));
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_10___iter__(PyObject *o, visitproc v, void *a) {
+  int e;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_10___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_10___iter__ *)o;
+  if (p->__pyx_v_self) {
+    e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
+  }
+  return 0;
+}
+
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_10___iter__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_10___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_10___iter__ *)o;
+  PyObject* tmp;
+  tmp = ((PyObject*)p->__pyx_v_self);
+  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_CandidateSet *)Py_None); Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  return 0;
+}
+
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_10___iter__[] = {
+  {0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_10___iter__ = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_long*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if PY_VERSION_HEX >= 0x02050000
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_10___iter__ = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_10___iter__ = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_10___iter__ = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_10___iter__ = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_10___iter__"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_10___iter__), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_10___iter__, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*tp_compare*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number___pyx_scope_struct_10___iter__, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_10___iter__, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_10___iter__, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_10___iter__, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
+  0, /*tp_doc*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_10___iter__, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_10___iter__, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_5_cdec___pyx_scope_struct_10___iter__, /*tp_methods*/
+  0, /*tp_members*/
+  0, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
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+  __Pyx_INCREF(((PyObject *)__pyx_n_s__utf8));
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+  __Pyx_GIVEREF(((PyObject *)__pyx_n_s__utf8));
+  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_34));
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+  /* "/Users/vchahun/Sandbox/cdec/python/src/mteval.pxi":89
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+ *         if not 0 <= k < self.cs.size():
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+  __Pyx_INCREF(((PyObject *)__pyx_kp_s_35));
+  PyTuple_SET_ITEM(__pyx_k_tuple_36, 0, ((PyObject *)__pyx_kp_s_35));
+  __Pyx_GIVEREF(((PyObject *)__pyx_kp_s_35));
+  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_36));
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+  /* "_cdec.pyx":47
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  *     def read_weights(self, cfg):
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-  PyTuple_SET_ITEM(__pyx_k_tuple_19, 1, Py_None);
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-  PyTuple_SET_ITEM(__pyx_k_tuple_19, 2, Py_None);
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-  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_19));
+  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_38));
 
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  *             inp = sentence.strip().encode('utf8')             # <<<<<<<<<<<<<<
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-  __Pyx_GOTREF(__pyx_k_tuple_20);
+  __pyx_k_tuple_39 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_39)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 54; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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   __Pyx_INCREF(((PyObject *)__pyx_n_s__utf8));
-  PyTuple_SET_ITEM(__pyx_k_tuple_20, 0, ((PyObject *)__pyx_n_s__utf8));
+  PyTuple_SET_ITEM(__pyx_k_tuple_39, 0, ((PyObject *)__pyx_n_s__utf8));
   __Pyx_GIVEREF(((PyObject *)__pyx_n_s__utf8));
-  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_20));
+  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_39));
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+ * BLEU = Scorer('IBM_BLEU')             # <<<<<<<<<<<<<<
+ * TER = Scorer('TER')
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+  __Pyx_INCREF(((PyObject *)__pyx_n_s__IBM_BLEU));
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+  __Pyx_GIVEREF(((PyObject *)__pyx_n_s__IBM_BLEU));
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+ * BLEU = Scorer('IBM_BLEU')
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+  __Pyx_INCREF(((PyObject *)__pyx_n_s__TER));
+  PyTuple_SET_ITEM(__pyx_k_tuple_42, 0, ((PyObject *)__pyx_n_s__TER));
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-  if (__Pyx_SetAttrString(__pyx_m, "SparseVector", (PyObject *)&__pyx_type_5_cdec_SparseVector) < 0) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 32; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+  if (__Pyx_SetAttrString(__pyx_m, "SparseVector", (PyObject *)&__pyx_type_5_cdec_SparseVector) < 0) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 36; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+  if (__Pyx_SetAttrString(__pyx_m, "SufficientStats", (PyObject *)&__pyx_type_5_cdec_SufficientStats) < 0) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 36; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+  if (__Pyx_SetAttrString(__pyx_m, "Scorer", (PyObject *)&__pyx_type_5_cdec_Scorer) < 0) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 122; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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   /*--- Variable import code ---*/
   /*--- Function import code ---*/
   /*--- Execution code ---*/
 
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+ * TER = Scorer('TER')
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+  /* "/Users/vchahun/Sandbox/cdec/python/src/mteval.pxi":154
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+  __Pyx_GOTREF(__pyx_t_1);
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+  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
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+  /* "_cdec.pyx":11
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  * 
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-  /* "_cdec.pyx":12
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+  __pyx_t_1 = PyDict_New(); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 13; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+  __pyx_t_3 = __Pyx_CreateClass(((PyObject *)__pyx_t_2), ((PyObject *)__pyx_t_1), __pyx_n_s__ParseFailed, __pyx_n_s___cdec); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 13; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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   __Pyx_DECREF(((PyObject *)__pyx_t_2)); __pyx_t_2 = 0;
-  if (PyObject_SetAttr(__pyx_m, __pyx_n_s__ParseFailed, __pyx_t_3) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 12; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s__ParseFailed, __pyx_t_3) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 13; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
   __Pyx_DECREF(((PyObject *)__pyx_t_1)); __pyx_t_1 = 0;
 
@@ -8673,6 +14929,18 @@ static int __Pyx_ArgTypeTest(PyObject *obj, PyTypeObject *type, int none_allowed
     return 0;
 }
 
+static CYTHON_INLINE int __Pyx_TypeTest(PyObject *obj, PyTypeObject *type) {
+    if (unlikely(!type)) {
+        PyErr_Format(PyExc_SystemError, "Missing type object");
+        return 0;
+    }
+    if (likely(PyObject_TypeCheck(obj, type)))
+        return 1;
+    PyErr_Format(PyExc_TypeError, "Cannot convert %.200s to %.200s",
+                 Py_TYPE(obj)->tp_name, type->tp_name);
+    return 0;
+}
+
 static void __Pyx_RaiseDoubleKeywordsError(
     const char* func_name,
     PyObject* kw_name)
@@ -8817,6 +15085,10 @@ static int __Pyx_IternextUnpackEndCheck(PyObject *retval, Py_ssize_t expected) {
 
 
 
+static CYTHON_INLINE void __Pyx_RaiseClosureNameError(const char *varname) {
+    PyErr_Format(PyExc_NameError, "free variable '%s' referenced before assignment in enclosing scope", varname);
+}
+
 static double __Pyx__PyObject_AsDouble(PyObject* obj) {
     PyObject* float_value;
     if (Py_TYPE(obj)->tp_as_number && Py_TYPE(obj)->tp_as_number->nb_float) {
@@ -8889,18 +15161,6 @@ bad:
     return -1;
 }
 
-static CYTHON_INLINE int __Pyx_TypeTest(PyObject *obj, PyTypeObject *type) {
-    if (unlikely(!type)) {
-        PyErr_Format(PyExc_SystemError, "Missing type object");
-        return 0;
-    }
-    if (likely(PyObject_TypeCheck(obj, type)))
-        return 1;
-    PyErr_Format(PyExc_TypeError, "Cannot convert %.200s to %.200s",
-                 Py_TYPE(obj)->tp_name, type->tp_name);
-    return 0;
-}
-
 static CYTHON_INLINE void __Pyx_ExceptionSave(PyObject **type, PyObject **value, PyObject **tb) {
     PyThreadState *tstate = PyThreadState_GET();
     *type = tstate->exc_type;
@@ -9006,6 +15266,365 @@ bad:
     return NULL;
 }
 
+static PyObject *
+__Pyx_CyFunction_get_doc(__pyx_CyFunctionObject *op, CYTHON_UNUSED void *closure)
+{
+    if (op->func_doc == NULL && op->func.m_ml->ml_doc) {
+#if PY_MAJOR_VERSION >= 3
+        op->func_doc = PyUnicode_FromString(op->func.m_ml->ml_doc);
+#else
+        op->func_doc = PyString_FromString(op->func.m_ml->ml_doc);
+#endif
+    }
+    if (op->func_doc == 0) {
+        Py_INCREF(Py_None);
+        return Py_None;
+    }
+    Py_INCREF(op->func_doc);
+    return op->func_doc;
+}
+static int
+__Pyx_CyFunction_set_doc(__pyx_CyFunctionObject *op, PyObject *value)
+{
+    PyObject *tmp = op->func_doc;
+    if (value == NULL)
+        op->func_doc = Py_None; /* Mark as deleted */
+    else
+        op->func_doc = value;
+    Py_INCREF(op->func_doc);
+    Py_XDECREF(tmp);
+    return 0;
+}
+static PyObject *
+__Pyx_CyFunction_get_name(__pyx_CyFunctionObject *op)
+{
+    if (op->func_name == NULL) {
+#if PY_MAJOR_VERSION >= 3
+        op->func_name = PyUnicode_InternFromString(op->func.m_ml->ml_name);
+#else
+        op->func_name = PyString_InternFromString(op->func.m_ml->ml_name);
+#endif
+    }
+    Py_INCREF(op->func_name);
+    return op->func_name;
+}
+static int
+__Pyx_CyFunction_set_name(__pyx_CyFunctionObject *op, PyObject *value)
+{
+    PyObject *tmp;
+#if PY_MAJOR_VERSION >= 3
+    if (value == NULL || !PyUnicode_Check(value)) {
+#else
+    if (value == NULL || !PyString_Check(value)) {
+#endif
+        PyErr_SetString(PyExc_TypeError,
+                        "__name__ must be set to a string object");
+        return -1;
+    }
+    tmp = op->func_name;
+    Py_INCREF(value);
+    op->func_name = value;
+    Py_XDECREF(tmp);
+    return 0;
+}
+static PyObject *
+__Pyx_CyFunction_get_self(__pyx_CyFunctionObject *m, CYTHON_UNUSED void *closure)
+{
+    PyObject *self;
+    self = m->func_closure;
+    if (self == NULL)
+        self = Py_None;
+    Py_INCREF(self);
+    return self;
+}
+static PyObject *
+__Pyx_CyFunction_get_dict(__pyx_CyFunctionObject *op)
+{
+    if (op->func_dict == NULL) {
+        op->func_dict = PyDict_New();
+        if (op->func_dict == NULL)
+            return NULL;
+    }
+    Py_INCREF(op->func_dict);
+    return op->func_dict;
+}
+static int
+__Pyx_CyFunction_set_dict(__pyx_CyFunctionObject *op, PyObject *value)
+{
+    PyObject *tmp;
+    if (value == NULL) {
+        PyErr_SetString(PyExc_TypeError,
+               "function's dictionary may not be deleted");
+        return -1;
+    }
+    if (!PyDict_Check(value)) {
+        PyErr_SetString(PyExc_TypeError,
+               "setting function's dictionary to a non-dict");
+        return -1;
+    }
+    tmp = op->func_dict;
+    Py_INCREF(value);
+    op->func_dict = value;
+    Py_XDECREF(tmp);
+    return 0;
+}
+static PyObject *
+__Pyx_CyFunction_get_globals(CYTHON_UNUSED __pyx_CyFunctionObject *op)
+{
+    PyObject* dict = PyModule_GetDict(__pyx_m);
+    Py_XINCREF(dict);
+    return dict;
+}
+static PyObject *
+__Pyx_CyFunction_get_closure(CYTHON_UNUSED __pyx_CyFunctionObject *op)
+{
+    Py_INCREF(Py_None);
+    return Py_None;
+}
+static PyObject *
+__Pyx_CyFunction_get_code(__pyx_CyFunctionObject *op)
+{
+    PyObject* result = (op->func_code) ? op->func_code : Py_None;
+    Py_INCREF(result);
+    return result;
+}
+static PyObject *
+__Pyx_CyFunction_get_defaults(__pyx_CyFunctionObject *op)
+{
+    if (op->defaults_tuple) {
+        Py_INCREF(op->defaults_tuple);
+        return op->defaults_tuple;
+    }
+    if (op->defaults_getter) {
+        PyObject *res = op->defaults_getter((PyObject *) op);
+        if (res) {
+            Py_INCREF(res);
+            op->defaults_tuple = res;
+        }
+        return res;
+    }
+    Py_INCREF(Py_None);
+    return Py_None;
+}
+static PyGetSetDef __pyx_CyFunction_getsets[] = {
+    {(char *) "func_doc", (getter)__Pyx_CyFunction_get_doc, (setter)__Pyx_CyFunction_set_doc, 0, 0},
+    {(char *) "__doc__",  (getter)__Pyx_CyFunction_get_doc, (setter)__Pyx_CyFunction_set_doc, 0, 0},
+    {(char *) "func_name", (getter)__Pyx_CyFunction_get_name, (setter)__Pyx_CyFunction_set_name, 0, 0},
+    {(char *) "__name__", (getter)__Pyx_CyFunction_get_name, (setter)__Pyx_CyFunction_set_name, 0, 0},
+    {(char *) "__self__", (getter)__Pyx_CyFunction_get_self, 0, 0, 0},
+    {(char *) "func_dict", (getter)__Pyx_CyFunction_get_dict, (setter)__Pyx_CyFunction_set_dict, 0, 0},
+    {(char *) "__dict__", (getter)__Pyx_CyFunction_get_dict, (setter)__Pyx_CyFunction_set_dict, 0, 0},
+    {(char *) "func_globals", (getter)__Pyx_CyFunction_get_globals, 0, 0, 0},
+    {(char *) "__globals__", (getter)__Pyx_CyFunction_get_globals, 0, 0, 0},
+    {(char *) "func_closure", (getter)__Pyx_CyFunction_get_closure, 0, 0, 0},
+    {(char *) "__closure__", (getter)__Pyx_CyFunction_get_closure, 0, 0, 0},
+    {(char *) "func_code", (getter)__Pyx_CyFunction_get_code, 0, 0, 0},
+    {(char *) "__code__", (getter)__Pyx_CyFunction_get_code, 0, 0, 0},
+    {(char *) "func_defaults", (getter)__Pyx_CyFunction_get_defaults, 0, 0, 0},
+    {(char *) "__defaults__", (getter)__Pyx_CyFunction_get_defaults, 0, 0, 0},
+    {0, 0, 0, 0, 0}
+};
+#ifndef PY_WRITE_RESTRICTED /* < Py2.5 */
+#define PY_WRITE_RESTRICTED WRITE_RESTRICTED
+#endif
+static PyMemberDef __pyx_CyFunction_members[] = {
+    {(char *) "__module__", T_OBJECT, offsetof(__pyx_CyFunctionObject, func.m_module), PY_WRITE_RESTRICTED, 0},
+    {0, 0, 0,  0, 0}
+};
+static PyObject *
+__Pyx_CyFunction_reduce(__pyx_CyFunctionObject *m, CYTHON_UNUSED PyObject *args)
+{
+#if PY_MAJOR_VERSION >= 3
+    return PyUnicode_FromString(m->func.m_ml->ml_name);
+#else
+    return PyString_FromString(m->func.m_ml->ml_name);
+#endif
+}
+static PyMethodDef __pyx_CyFunction_methods[] = {
+    {__Pyx_NAMESTR("__reduce__"), (PyCFunction)__Pyx_CyFunction_reduce, METH_VARARGS, 0},
+    {0, 0, 0, 0}
+};
+static PyObject *__Pyx_CyFunction_New(PyTypeObject *type, PyMethodDef *ml, int flags,
+                                      PyObject *closure, PyObject *module, PyObject* code) {
+    __pyx_CyFunctionObject *op = PyObject_GC_New(__pyx_CyFunctionObject, type);
+    if (op == NULL)
+        return NULL;
+    op->flags = flags;
+    op->func_weakreflist = NULL;
+    op->func.m_ml = ml;
+    op->func.m_self = (PyObject *) op;
+    Py_XINCREF(closure);
+    op->func_closure = closure;
+    Py_XINCREF(module);
+    op->func.m_module = module;
+    op->func_dict = NULL;
+    op->func_name = NULL;
+    op->func_doc = NULL;
+    op->func_classobj = NULL;
+    Py_XINCREF(code);
+    op->func_code = code;
+    op->defaults_pyobjects = 0;
+    op->defaults = NULL;
+    op->defaults_tuple = NULL;
+    op->defaults_getter = NULL;
+    PyObject_GC_Track(op);
+    return (PyObject *) op;
+}
+static int
+__Pyx_CyFunction_clear(__pyx_CyFunctionObject *m)
+{
+    Py_CLEAR(m->func_closure);
+    Py_CLEAR(m->func.m_module);
+    Py_CLEAR(m->func_dict);
+    Py_CLEAR(m->func_name);
+    Py_CLEAR(m->func_doc);
+    Py_CLEAR(m->func_code);
+    Py_CLEAR(m->func_classobj);
+    Py_CLEAR(m->defaults_tuple);
+    if (m->defaults) {
+        PyObject **pydefaults = __Pyx_CyFunction_Defaults(PyObject *, m);
+        int i;
+        for (i = 0; i < m->defaults_pyobjects; i++)
+            Py_XDECREF(pydefaults[i]);
+        PyMem_Free(m->defaults);
+        m->defaults = NULL;
+    }
+    return 0;
+}
+static void __Pyx_CyFunction_dealloc(__pyx_CyFunctionObject *m)
+{
+    PyObject_GC_UnTrack(m);
+    if (m->func_weakreflist != NULL)
+        PyObject_ClearWeakRefs((PyObject *) m);
+    __Pyx_CyFunction_clear(m);
+    PyObject_GC_Del(m);
+}
+static int __Pyx_CyFunction_traverse(__pyx_CyFunctionObject *m, visitproc visit, void *arg)
+{
+    Py_VISIT(m->func_closure);
+    Py_VISIT(m->func.m_module);
+    Py_VISIT(m->func_dict);
+    Py_VISIT(m->func_name);
+    Py_VISIT(m->func_doc);
+    Py_VISIT(m->func_code);
+    Py_VISIT(m->func_classobj);
+    Py_VISIT(m->defaults_tuple);
+    if (m->defaults) {
+        PyObject **pydefaults = __Pyx_CyFunction_Defaults(PyObject *, m);
+        int i;
+        for (i = 0; i < m->defaults_pyobjects; i++)
+            Py_VISIT(pydefaults[i]);
+    }
+    return 0;
+}
+static PyObject *__Pyx_CyFunction_descr_get(PyObject *func, PyObject *obj, PyObject *type)
+{
+    __pyx_CyFunctionObject *m = (__pyx_CyFunctionObject *) func;
+    if (m->flags & __Pyx_CYFUNCTION_STATICMETHOD) {
+        Py_INCREF(func);
+        return func;
+    }
+    if (m->flags & __Pyx_CYFUNCTION_CLASSMETHOD) {
+        if (type == NULL)
+            type = (PyObject *)(Py_TYPE(obj));
+        return PyMethod_New(func,
+                            type, (PyObject *)(Py_TYPE(type)));
+    }
+    if (obj == Py_None)
+        obj = NULL;
+    return PyMethod_New(func, obj, type);
+}
+static PyObject*
+__Pyx_CyFunction_repr(__pyx_CyFunctionObject *op)
+{
+    PyObject *func_name = __Pyx_CyFunction_get_name(op);
+#if PY_MAJOR_VERSION >= 3
+    return PyUnicode_FromFormat("<cyfunction %U at %p>",
+                                func_name, (void *)op);
+#else
+    return PyString_FromFormat("<cyfunction %s at %p>",
+                               PyString_AsString(func_name), (void *)op);
+#endif
+}
+static PyTypeObject __pyx_CyFunctionType_type = {
+    PyVarObject_HEAD_INIT(0, 0)
+    __Pyx_NAMESTR("cython_function_or_method"), /*tp_name*/
+    sizeof(__pyx_CyFunctionObject),   /*tp_basicsize*/
+    0,                                  /*tp_itemsize*/
+    (destructor) __Pyx_CyFunction_dealloc, /*tp_dealloc*/
+    0,                                  /*tp_print*/
+    0,                                  /*tp_getattr*/
+    0,                                  /*tp_setattr*/
+#if PY_MAJOR_VERSION < 3
+    0,                                  /*tp_compare*/
+#else
+    0,                                  /*reserved*/
+#endif
+    (reprfunc) __Pyx_CyFunction_repr,   /*tp_repr*/
+    0,                                  /*tp_as_number*/
+    0,                                  /*tp_as_sequence*/
+    0,                                  /*tp_as_mapping*/
+    0,                                  /*tp_hash*/
+    __Pyx_PyCFunction_Call,             /*tp_call*/
+    0,                                  /*tp_str*/
+    0,                                  /*tp_getattro*/
+    0,                                  /*tp_setattro*/
+    0,                                  /*tp_as_buffer*/
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags*/
+    0,                                  /*tp_doc*/
+    (traverseproc) __Pyx_CyFunction_traverse,   /*tp_traverse*/
+    (inquiry) __Pyx_CyFunction_clear,   /*tp_clear*/
+    0,                                  /*tp_richcompare*/
+    offsetof(__pyx_CyFunctionObject, func_weakreflist), /* tp_weaklistoffse */
+    0,                                  /*tp_iter*/
+    0,                                  /*tp_iternext*/
+    __pyx_CyFunction_methods,           /*tp_methods*/
+    __pyx_CyFunction_members,           /*tp_members*/
+    __pyx_CyFunction_getsets,           /*tp_getset*/
+    0,                                  /*tp_base*/
+    0,                                  /*tp_dict*/
+    __Pyx_CyFunction_descr_get,         /*tp_descr_get*/
+    0,                                  /*tp_descr_set*/
+    offsetof(__pyx_CyFunctionObject, func_dict),/*tp_dictoffset*/
+    0,                                  /*tp_init*/
+    0,                                  /*tp_alloc*/
+    0,                                  /*tp_new*/
+    0,                                  /*tp_free*/
+    0,                                  /*tp_is_gc*/
+    0,                                  /*tp_bases*/
+    0,                                  /*tp_mro*/
+    0,                                  /*tp_cache*/
+    0,                                  /*tp_subclasses*/
+    0,                                  /*tp_weaklist*/
+    0,                                  /*tp_del*/
+#if PY_VERSION_HEX >= 0x02060000
+    0,                                  /*tp_version_tag*/
+#endif
+};
+static int __Pyx_CyFunction_init(void)
+{
+    if (PyType_Ready(&__pyx_CyFunctionType_type) < 0)
+        return -1;
+    __pyx_CyFunctionType = &__pyx_CyFunctionType_type;
+    return 0;
+}
+void *__Pyx_CyFunction_InitDefaults(PyObject *func, size_t size, int pyobjects)
+{
+    __pyx_CyFunctionObject *m = (__pyx_CyFunctionObject *) func;
+    m->defaults = PyMem_Malloc(size);
+    if (!m->defaults)
+        return PyErr_NoMemory();
+    memset(m->defaults, 0, sizeof(size));
+    m->defaults_pyobjects = pyobjects;
+    return m->defaults;
+}
+static void __Pyx_CyFunction_SetDefaultsTuple(PyObject *func, PyObject *tuple)
+{
+    __pyx_CyFunctionObject *m = (__pyx_CyFunctionObject *) func;
+    m->defaults_tuple = tuple;
+    Py_INCREF(tuple);
+}
+
 static CYTHON_INLINE unsigned char __Pyx_PyInt_AsUnsignedChar(PyObject* x) {
     const unsigned char neg_one = (unsigned char)-1, const_zero = 0;
     const int is_unsigned = neg_one > const_zero;
@@ -9693,6 +16312,25 @@ static int __pyx_Generator_init(void)
     return PyType_Ready(&__pyx_GeneratorType);
 }
 
+static void __Pyx_WriteUnraisable(const char *name, int clineno,
+                                  int lineno, const char *filename) {
+    PyObject *old_exc, *old_val, *old_tb;
+    PyObject *ctx;
+    __Pyx_ErrFetch(&old_exc, &old_val, &old_tb);
+    #if PY_MAJOR_VERSION < 3
+    ctx = PyString_FromString(name);
+    #else
+    ctx = PyUnicode_FromString(name);
+    #endif
+    __Pyx_ErrRestore(old_exc, old_val, old_tb);
+    if (!ctx) {
+        PyErr_WriteUnraisable(Py_None);
+    } else {
+        PyErr_WriteUnraisable(ctx);
+        Py_DECREF(ctx);
+    }
+}
+
 static int __Pyx_check_binary_version(void) {
     char ctversion[4], rtversion[4];
     PyOS_snprintf(ctversion, 4, "%d.%d", PY_MAJOR_VERSION, PY_MINOR_VERSION);
diff --git a/python/src/_cdec.pyx b/python/src/_cdec.pyx
index 698a66f6..cccfec0b 100644
--- a/python/src/_cdec.pyx
+++ b/python/src/_cdec.pyx
@@ -6,15 +6,15 @@ cimport decoder
 include "vectors.pxi"
 include "hypergraph.pxi"
 include "lattice.pxi"
+include "mteval.pxi"
 
 SetSilent(True)
 
-class ParseFailed(Exception):
-    pass
+class ParseFailed(Exception): pass
 
 cdef class Decoder:
     cdef decoder.Decoder* dec
-    cdef public DenseVector weights
+    cdef DenseVector weights
 
     def __cinit__(self, char* config):
         decoder.register_feature_functions()
@@ -27,6 +27,22 @@ cdef class Decoder:
     def __dealloc__(self):
         del self.dec
 
+    property weights:
+        def __get__(self):
+            return self.weights
+
+        def __set__(self, weights):
+            if isinstance(weights, DenseVector):
+                self.weights.vector[0] = (<DenseVector> weights).vector[0]
+            elif isinstance(weights, SparseVector):
+                self.weights.vector.clear()
+                ((<SparseVector> weights).vector[0]).init_vector(self.weights.vector)
+            elif isinstance(weights, dict):
+                for fname, fval in weights.items():
+                    self.weights[fname] = fval
+            else:
+                raise TypeError('cannot initialize weights with %s' % type(weights))
+
     def read_weights(self, cfg):
         with open(cfg) as fp:
             for line in fp:
diff --git a/python/src/hypergraph.pxi b/python/src/hypergraph.pxi
index c226d105..9d09722e 100644
--- a/python/src/hypergraph.pxi
+++ b/python/src/hypergraph.pxi
@@ -32,26 +32,45 @@ cdef class Hypergraph:
     def kbest(self, size):
         cdef kb.KBestDerivations[vector[WordID], kb.ESentenceTraversal]* derivations = new kb.KBestDerivations[vector[WordID], kb.ESentenceTraversal](self.hg[0], size)
         cdef kb.KBestDerivations[vector[WordID], kb.ESentenceTraversal].Derivation* derivation
-        cdef str sentence
+        cdef bytes sentence
         cdef unsigned k
-        for k in range(size):
-            derivation = derivations.LazyKthBest(self.hg.nodes_.size() - 1, k)
-            if not derivation: break
-            sentence = GetString(derivation._yield).c_str()
-            yield sentence.decode('utf8')
-        del derivations
+        try:
+            for k in range(size):
+                derivation = derivations.LazyKthBest(self.hg.nodes_.size() - 1, k)
+                if not derivation: break
+                sentence = GetString(derivation._yield).c_str()
+                yield sentence.decode('utf8')
+        finally:
+            del derivations
 
     def kbest_tree(self, size):
         cdef kb.KBestDerivations[vector[WordID], kb.ETreeTraversal]* derivations = new kb.KBestDerivations[vector[WordID], kb.ETreeTraversal](self.hg[0], size)
         cdef kb.KBestDerivations[vector[WordID], kb.ETreeTraversal].Derivation* derivation
         cdef str tree
         cdef unsigned k
-        for k in range(size):
-            derivation = derivations.LazyKthBest(self.hg.nodes_.size() - 1, k)
-            if not derivation: break
-            tree = GetString(derivation._yield).c_str()
-            yield tree.decode('utf8')
-        del derivations
+        try:
+            for k in range(size):
+                derivation = derivations.LazyKthBest(self.hg.nodes_.size() - 1, k)
+                if not derivation: break
+                tree = GetString(derivation._yield).c_str()
+                yield tree.decode('utf8')
+        finally:
+            del derivations
+
+    def kbest_features(self, size):
+        cdef kb.KBestDerivations[FastSparseVector[weight_t], kb.FeatureVectorTraversal]* derivations = new kb.KBestDerivations[FastSparseVector[weight_t], kb.FeatureVectorTraversal](self.hg[0], size)
+        cdef kb.KBestDerivations[FastSparseVector[weight_t], kb.FeatureVectorTraversal].Derivation* derivation
+        cdef SparseVector fmap
+        cdef unsigned k
+        try:
+            for k in range(size):
+                derivation = derivations.LazyKthBest(self.hg.nodes_.size() - 1, k)
+                if not derivation: break
+                fmap = SparseVector()
+                fmap.vector = new FastSparseVector[weight_t](derivation._yield)
+                yield fmap
+        finally:
+            del derivations
 
     def sample(self, unsigned n):
         cdef vector[hypergraph.Hypothesis]* hypos = new vector[hypergraph.Hypothesis]()
@@ -60,10 +79,12 @@ cdef class Hypergraph:
         hypergraph.sample_hypotheses(self.hg[0], n, self.rng, hypos)
         cdef str sentence
         cdef unsigned k
-        for k in range(hypos.size()):
-            sentence = GetString(hypos[0][k].words).c_str()
-            yield sentence.decode('utf8')
-        del hypos
+        try:
+            for k in range(hypos.size()):
+                sentence = GetString(hypos[0][k].words).c_str()
+                yield sentence.decode('utf8')
+        finally:
+            del hypos
 
     # TODO richer k-best/sample output (feature vectors, trees?)
 
@@ -76,6 +97,8 @@ cdef class Hypergraph:
              preserve_mask = new hypergraph.EdgeMask(self.hg.edges_.size())
              preserve_mask[0][hypergraph.GetFullWordEdgeIndex(self.hg[0])] = True
         self.hg.PruneInsideOutside(beam_alpha, density, preserve_mask, False, 1, False)
+        if preserve_mask:
+            del preserve_mask
 
     def lattice(self): # TODO direct hg -> lattice conversion in cdec
         cdef str plf = hypergraph.AsPLF(self.hg[0], True).c_str()
@@ -87,6 +110,6 @@ cdef class Hypergraph:
         elif isinstance(weights, DenseVector):
             self.hg.Reweight((<DenseVector> weights).vector[0])
         else:
-            raise ValueError('cannot reweight hypergraph with %s' % type(weights))
+            raise TypeError('cannot reweight hypergraph with %s' % type(weights))
 
     # TODO get feature expectations, get partition function ("inside" score)
diff --git a/python/src/kbest.pxd b/python/src/kbest.pxd
index f34ac5ed..cef42bd3 100644
--- a/python/src/kbest.pxd
+++ b/python/src/kbest.pxd
@@ -9,6 +9,8 @@ cdef extern from "decoder/viterbi.h":
         pass
     cdef cppclass FTreeTraversal:
         pass
+    cdef cppclass FeatureVectorTraversal:
+        pass
 
 cdef extern from "decoder/kbest.h" namespace "KBest":
     cdef cppclass KBestDerivations[T, Traversal]:
diff --git a/python/src/lattice.pxi b/python/src/lattice.pxi
index 493c6dcd..f8341e29 100644
--- a/python/src/lattice.pxi
+++ b/python/src/lattice.pxi
@@ -54,3 +54,15 @@ cdef class Lattice:
 
     def __dealloc__(self):
         del self.lattice
+
+    def todot(self):
+        def lines():
+            yield 'digraph lattice {'
+            yield 'rankdir = LR;'
+            yield 'node [shape=circle];'
+            for i in range(len(self)):
+                for label, weight, delta in self[i]:
+                    yield '%d -> %d [label="%s"];' % (i, i+delta, label.replace('"', '\\"'))
+            yield '%d [shape=doublecircle]' % len(self)
+            yield '}'
+        return '\n'.join(lines()).encode('utf8')
diff --git a/python/src/mteval.pxd b/python/src/mteval.pxd
new file mode 100644
index 00000000..52af6297
--- /dev/null
+++ b/python/src/mteval.pxd
@@ -0,0 +1,47 @@
+from libcpp.vector cimport vector
+from libcpp.string cimport string
+from utils cimport *
+from hypergraph cimport Hypergraph
+
+cdef extern from "mteval/ns.h":
+    cdef cppclass SufficientStats:
+        SufficientStats()
+        SufficientStats(SufficientStats&)
+        unsigned size()
+        float operator[](unsigned i)
+        void swap(SufficientStats& other)
+
+    SufficientStats add "operator+" (SufficientStats&, SufficientStats&)
+
+    cdef cppclass SegmentEvaluator:
+        void Evaluate(vector[WordID]& hyp, SufficientStats* out)
+
+    cdef cppclass EvaluationMetric:
+        string& MetricId()
+        bint IsErrorMetric()
+        float ComputeScore(SufficientStats& stats)
+        string DetailedScore(SufficientStats& stats)
+        shared_ptr[SegmentEvaluator] CreateSegmentEvaluator(vector[vector[WordID]]& refs)
+        ComputeSufficientStatistics(vector[WordID]& hyp,
+                                    vector[WordID]& refs,
+                                    SufficientStats* out)
+
+cdef extern from "mteval/ns.h" namespace "EvaluationMetric":
+    EvaluationMetric* Instance(string& metric_id)
+    EvaluationMetric* Instance() # IBM_BLEU
+
+cdef extern from "training/candidate_set.h" namespace "training":
+    cdef cppclass Candidate "const training::Candidate":
+        vector[WordID] ewords
+        FastSparseVector[weight_t] fmap
+        SufficientStats eval_feats
+
+    cdef cppclass CandidateSet:
+        CandidateSet()
+        unsigned size()
+        Candidate& operator[](unsigned i)
+        void ReadFromFile(string& file)
+        void WriteToFile(string& file)
+        void AddKBestCandidates(Hypergraph& hg,
+                unsigned kbest_size,
+                SegmentEvaluator* scorer)
diff --git a/python/src/mteval.pxi b/python/src/mteval.pxi
new file mode 100644
index 00000000..d90eb9a6
--- /dev/null
+++ b/python/src/mteval.pxi
@@ -0,0 +1,154 @@
+cimport mteval
+
+cdef char* as_str(sentence, error_msg='Cannot convert type %s to str'):
+    cdef bytes ret
+    if isinstance(sentence, unicode):
+        ret = sentence.encode('utf8')
+    elif isinstance(sentence, str):
+        ret = sentence
+    else:
+        raise TypeError(error_msg % type(sentence))
+    return ret
+
+cdef SufficientStats as_stats(x, y):
+    if isinstance(x, SufficientStats):
+        return x
+    elif x == 0 and isinstance(y, SufficientStats):
+        stats = SufficientStats()
+        stats.stats = new mteval.SufficientStats()
+        stats.metric = (<SufficientStats> y).metric
+        return stats
+
+cdef class Candidate:
+    cdef mteval.Candidate* candidate
+    cdef public float score
+
+    property words:
+        def __get__(self):
+            return unicode(GetString(self.candidate.ewords).c_str(), encoding='utf8')
+
+    property fmap:
+        def __get__(self):
+            cdef SparseVector fmap = SparseVector()
+            fmap.vector = new FastSparseVector[weight_t](self.candidate.fmap)
+            return fmap
+
+cdef class SufficientStats:
+    cdef mteval.SufficientStats* stats
+    cdef mteval.EvaluationMetric* metric
+
+    def __dealloc__(self):
+        del self.stats
+
+    property score:
+        def __get__(self):
+            return self.metric.ComputeScore(self.stats[0])
+
+    property detail:
+        def __get__(self):
+            return self.metric.DetailedScore(self.stats[0]).c_str()
+
+    def __len__(self):
+        return self.stats.size()
+
+    def __iter__(self):
+        for i in range(len(self)):
+            yield self.stats[0][i]
+
+    def __iadd__(SufficientStats self, SufficientStats other):
+        self.stats[0] += other.stats[0]
+        return self
+
+    def __add__(x, y):
+        cdef SufficientStats sx = as_stats(x, y)
+        cdef SufficientStats sy = as_stats(y, x)
+        cdef SufficientStats result = SufficientStats()
+        result.stats = new mteval.SufficientStats(mteval.add(sx.stats[0], sy.stats[0]))
+        result.metric = sx.metric
+        return result
+
+cdef class CandidateSet:
+    cdef shared_ptr[mteval.SegmentEvaluator]* scorer
+    cdef mteval.EvaluationMetric* metric
+    cdef mteval.CandidateSet* cs
+
+    def __cinit__(self, SegmentEvaluator evaluator):
+        self.scorer = new shared_ptr[mteval.SegmentEvaluator](evaluator.scorer[0])
+        self.metric = evaluator.metric
+        self.cs = new mteval.CandidateSet()
+
+    def __dealloc__(self):
+        del self.scorer
+        del self.cs
+
+    def __len__(self):
+        return self.cs.size()
+
+    def __getitem__(self,int k):
+        if not 0 <= k < self.cs.size():
+            raise IndexError('candidate set index out of range')
+        cdef Candidate candidate = Candidate()
+        candidate.candidate = &self.cs[0][k]
+        candidate.score = self.metric.ComputeScore(self.cs[0][k].eval_feats)
+        return candidate
+
+    def __iter__(self):
+        cdef unsigned i
+        for i in range(len(self)):
+            yield self[i]
+
+    def add_kbest(self, Hypergraph hypergraph, unsigned k):
+        self.cs.AddKBestCandidates(hypergraph.hg[0], k, self.scorer.get())
+
+cdef class SegmentEvaluator:
+    cdef shared_ptr[mteval.SegmentEvaluator]* scorer
+    cdef mteval.EvaluationMetric* metric
+    
+    def __dealloc__(self):
+        del self.scorer
+
+    def evaluate(self, sentence):
+        cdef vector[WordID] hyp
+        cdef SufficientStats sf = SufficientStats()
+        sf.metric = self.metric
+        sf.stats = new mteval.SufficientStats()
+        ConvertSentence(string(as_str(sentence.strip())), &hyp)
+        self.scorer.get().Evaluate(hyp, sf.stats)
+        return sf
+
+    def candidate_set(self):
+        return CandidateSet(self)
+
+cdef class Scorer:
+    cdef string* name
+
+    def __cinit__(self, char* name):
+        self.name = new string(name)
+
+    def __dealloc__(self):
+        del self.name
+    
+    def __call__(self, refs):
+        cdef mteval.EvaluationMetric* metric = mteval.Instance(self.name[0])
+        if isinstance(refs, unicode) or isinstance(refs, str):
+            refs = [refs]
+        cdef vector[vector[WordID]]* refsv = new vector[vector[WordID]]()
+        cdef vector[WordID]* refv
+        cdef bytes ref_str
+        for ref in refs:
+            refv = new vector[WordID]()
+            ConvertSentence(string(as_str(ref.strip())), refv)
+            refsv.push_back(refv[0])
+            del refv
+        cdef unsigned i
+        cdef SegmentEvaluator evaluator = SegmentEvaluator()
+        evaluator.metric = metric
+        evaluator.scorer = new shared_ptr[mteval.SegmentEvaluator](metric.CreateSegmentEvaluator(refsv[0]))
+        del refsv # in theory should not delete but store in SegmentEvaluator
+        return evaluator
+
+    def __str__(self):
+        return self.name.c_str()
+
+BLEU = Scorer('IBM_BLEU')
+TER = Scorer('TER')
diff --git a/python/src/utils.pxd b/python/src/utils.pxd
index 3d518524..94fab5ef 100644
--- a/python/src/utils.pxd
+++ b/python/src/utils.pxd
@@ -50,16 +50,19 @@ cdef extern from "utils/sparse_vector.h":
 
     FastSparseVector[weight_t] operator+(FastSparseVector[weight_t]&, FastSparseVector[weight_t]&)
     FastSparseVector[weight_t] operator-(FastSparseVector[weight_t]&, FastSparseVector[weight_t]&)
+    FastSparseVector[weight_t] operator*(FastSparseVector[weight_t]&, double&)
+    FastSparseVector[weight_t] operator/(FastSparseVector[weight_t]&, double&)
     ostream operator<<(ostream& out, FastSparseVector[weight_t]& v)
 
 cdef extern from "utils/weights.h" namespace "Weights":
     void InitSparseVector(vector[weight_t]& dv, FastSparseVector[weight_t]* sv)
 
-cdef extern from "utils/tdict.cc" namespace "TD":
+cdef extern from "utils/tdict.h" namespace "TD":
     string GetString(vector[WordID]& st)
     unsigned NumWords()
     WordID TDConvert "TD::Convert" (char*)
     char* TDConvert "TD::Convert" (WordID)
+    void ConvertSentence(string& sent, vector[WordID]* ids)
 
 cdef extern from "utils/verbose.h":
     void SetSilent(bint)
@@ -76,3 +79,8 @@ cdef extern from "utils/filelib.h":
 cdef extern from "utils/sampler.h":
     cdef cppclass MT19937:
         pass
+
+cdef extern from "<boost/shared_ptr.hpp>" namespace "boost":
+    cdef cppclass shared_ptr[T]:
+        shared_ptr(shared_ptr& r)
+        T* get()
diff --git a/python/src/vectors.pxi b/python/src/vectors.pxi
index 74d3a0bd..ce95968c 100644
--- a/python/src/vectors.pxi
+++ b/python/src/vectors.pxi
@@ -1,16 +1,20 @@
 from cython.operator cimport preincrement as pinc
 
 cdef class DenseVector:
-    cdef vector[weight_t]* vector
+    cdef vector[weight_t]* vector # Not owned by DenseVector
+
+    def __len__(self):
+        return self.vector.size()
 
     def __getitem__(self, char* fname):
-        cdef unsigned fid = FDConvert(fname)
-        if fid <= self.vector.size():
+        cdef int fid = FDConvert(fname)
+        if 0 <= fid < self.vector.size():
             return self.vector[0][fid]
         raise KeyError(fname)
     
     def __setitem__(self, char* fname, float value):
-        cdef unsigned fid = FDConvert(<char *>fname)
+        cdef int fid = FDConvert(<char *>fname)
+        if fid < 0: raise KeyError(fname)
         if self.vector.size() <= fid:
             self.vector.resize(fid + 1)
         self.vector[0][fid] = value
@@ -32,40 +36,43 @@ cdef class DenseVector:
 cdef class SparseVector:
     cdef FastSparseVector[weight_t]* vector
 
+    def __dealloc__(self):
+        del self.vector
+
+    def copy(self):
+        return self * 1
+
     def __getitem__(self, char* fname):
-        cdef unsigned fid = FDConvert(fname)
+        cdef int fid = FDConvert(fname)
+        if fid < 0: raise KeyError(fname)
         return self.vector.value(fid)
     
     def __setitem__(self, char* fname, float value):
-        cdef unsigned fid = FDConvert(<char *>fname)
+        cdef int fid = FDConvert(<char *>fname)
+        if fid < 0: raise KeyError(fname)
         self.vector.set_value(fid, value)
 
     def __iter__(self):
         cdef FastSparseVector[weight_t].const_iterator* it = new FastSparseVector[weight_t].const_iterator(self.vector[0], False)
-        cdef str fname
-        for i in range(self.vector.size()):
-            fname = FDConvert(it[0].ptr().first).c_str()
-            yield (fname, it[0].ptr().second)
-            pinc(it[0])
+        try:
+            for i in range(self.vector.size()):
+                yield (FDConvert(it[0].ptr().first).c_str(), it[0].ptr().second)
+                pinc(it[0]) # ++it
+        finally:
+            del it
 
     def dot(self, other):
         if isinstance(other, DenseVector):
             return self.vector.dot((<DenseVector> other).vector[0])
         elif isinstance(other, SparseVector):
             return self.vector.dot((<SparseVector> other).vector[0])
-        raise ValueError('cannot take the dot product of %s and SparseVector' % type(other))
-
-    def todense(self):
-        cdef DenseVector dense = DenseVector()
-        dense.vector = new vector[weight_t]()
-        self.vector.init_vector(dense.vector)
-        return dense
+        raise TypeError('cannot take the dot product of %s and SparseVector' % type(other))
     
-    def __richcmp__(SparseVector self, SparseVector other, int op):
+    def __richcmp__(SparseVector x, SparseVector y, int op):
         if op == 2: # ==
-            return self.vector[0] == other.vector[0]
+            return x.vector[0] == y.vector[0]
         elif op == 3: # !=
-            return not (self == other)
+            return not (x == y)
         raise NotImplemented('comparison not implemented for SparseVector')
 
     def __len__(self):
@@ -73,6 +80,12 @@ cdef class SparseVector:
 
     def __contains__(self, char* fname):
         return self.vector.nonzero(FDConvert(fname))
+
+    def __neg__(self):
+        cdef SparseVector result = SparseVector()
+        result.vector = new FastSparseVector[weight_t](self.vector[0])
+        result.vector[0] *= -1.0
+        return result
     
     def __iadd__(SparseVector self, SparseVector other):
         self.vector[0] += other.vector[0]
@@ -90,12 +103,30 @@ cdef class SparseVector:
         self.vector[0] /= scalar
         return self
 
-    def __add__(SparseVector self, SparseVector other):
+    def __add__(SparseVector x, SparseVector y):
+        cdef SparseVector result = SparseVector()
+        result.vector = new FastSparseVector[weight_t](x.vector[0] + y.vector[0])
+        return result
+
+    def __sub__(SparseVector x, SparseVector y):
+        cdef SparseVector result = SparseVector()
+        result.vector = new FastSparseVector[weight_t](x.vector[0] - y.vector[0])
+        return result
+
+    def __mul__(x, y):
+        cdef SparseVector vector
+        cdef float scalar
+        if isinstance(x, SparseVector): vector, scalar = x, y
+        else: vector, scalar = y, x
         cdef SparseVector result = SparseVector()
-        result.vector = new FastSparseVector[weight_t](self.vector[0] + other.vector[0])
+        result.vector = new FastSparseVector[weight_t](vector.vector[0] * scalar)
         return result
 
-    def __sub__(SparseVector self, SparseVector other):
+    def __div__(x, y):
+        cdef SparseVector vector
+        cdef float scalar
+        if isinstance(x, SparseVector): vector, scalar = x, y
+        else: vector, scalar = y, x
         cdef SparseVector result = SparseVector()
-        result.vector = new FastSparseVector[weight_t](self.vector[0] - other.vector[0])
+        result.vector = new FastSparseVector[weight_t](vector.vector[0] / scalar)
         return result
diff --git a/python/test.py b/python/test.py
index 92403298..8069aa0a 100644
--- a/python/test.py
+++ b/python/test.py
@@ -31,9 +31,11 @@ print ' FTree[0]:', forest.viterbi_source_tree().encode('utf8')
 print 'LgProb[0]:', forest.viterbi_features().dot(decoder.weights)
 
 # Get k-best translations
-for i, (sentence, tree) in enumerate(zip(forest.kbest(5), forest.kbest_tree(5)), 1):
+kbest = zip(forest.kbest(5), forest.kbest_tree(5), forest.kbest_features(5))
+for i, (sentence, tree, features) in enumerate(kbest, 1):
     print 'Output[%d]:' % i, sentence.encode('utf8')
     print '  Tree[%d]:' % i, tree.encode('utf8')
+    print ' FVect[%d]:' % i, dict(features)
 
 # Sample translations from the forest
 for sentence in forest.sample(5):
@@ -58,3 +60,6 @@ print forest.viterbi_source_tree()
 # Compare 1best and reference feature vectors
 fref = forest.viterbi_features()
 print dict(fsrc - fref)
+
+# Prune hypergraph
+forest.prune(density=100)
diff --git a/training/Makefile.am b/training/Makefile.am
index 68ebfab4..4cef0d5b 100644
--- a/training/Makefile.am
+++ b/training/Makefile.am
@@ -26,6 +26,7 @@ TESTS = lbfgs_test optimize_test
 noinst_LIBRARIES = libtraining.a
 libtraining_a_SOURCES = \
   candidate_set.cc \
+  entropy.cc \
   optimize.cc \
   online_optimizer.cc \
   risk.cc
diff --git a/training/candidate_set.cc b/training/candidate_set.cc
index 8c086ece..087efec3 100644
--- a/training/candidate_set.cc
+++ b/training/candidate_set.cc
@@ -4,6 +4,7 @@
 
 #include <boost/functional/hash.hpp>
 
+#include "verbose.h"
 #include "ns.h"
 #include "filelib.h"
 #include "wordid.h"
@@ -118,7 +119,7 @@ void CandidateSet::WriteToFile(const string& file) const {
 }
 
 void CandidateSet::ReadFromFile(const string& file) {
-  cerr << "Reading candidates from " << file << endl;
+  if(!SILENT) cerr << "Reading candidates from " << file << endl;
   ReadFile rf(file);
   istream& in = *rf.stream();
   string cand;
@@ -133,11 +134,11 @@ void CandidateSet::ReadFromFile(const string& file) {
     ParseSparseVector(feats, 0, &cs.back().fmap);
     cs.back().eval_feats = SufficientStats(ss);
   }
-  cerr << "  read " << cs.size() << " candidates\n";
+  if(!SILENT) cerr << "  read " << cs.size() << " candidates\n";
 }
 
 void CandidateSet::Dedup() {
-  cerr << "Dedup in=" << cs.size();
+  if(!SILENT) cerr << "Dedup in=" << cs.size();
   tr1::unordered_set<Candidate, CandidateHasher, CandidateCompare> u;
   while(cs.size() > 0) {
     u.insert(cs.back());
@@ -148,7 +149,7 @@ void CandidateSet::Dedup() {
     cs.push_back(*it);
     it = u.erase(it);
   }
-  cerr << "  out=" << cs.size() << endl;
+  if(!SILENT) cerr << "  out=" << cs.size() << endl;
 }
 
 void CandidateSet::AddKBestCandidates(const Hypergraph& hg, size_t kbest_size, const SegmentEvaluator* scorer) {
diff --git a/training/entropy.cc b/training/entropy.cc
new file mode 100644
index 00000000..4fdbe2be
--- /dev/null
+++ b/training/entropy.cc
@@ -0,0 +1,41 @@
+#include "entropy.h"
+
+#include "prob.h"
+#include "candidate_set.h"
+
+using namespace std;
+
+namespace training {
+
+// see Mann and McCallum "Efficient Computation of Entropy Gradient ..." for
+// a mostly clear derivation of:
+//   g = E[ F(x,y) * log p(y|x) ] + H(y | x) * E[ F(x,y) ]
+double CandidateSetEntropy::operator()(const vector<double>& params,
+                                       SparseVector<double>* g) const {
+  prob_t z;
+  vector<double> dps(cands_.size());
+  for (unsigned i = 0; i < cands_.size(); ++i) {
+    dps[i] = cands_[i].fmap.dot(params);
+    const prob_t u(dps[i], init_lnx());
+    z += u;
+  }
+  const double log_z = log(z);
+
+  SparseVector<double> exp_feats;
+  double entropy = 0;
+  for (unsigned i = 0; i < cands_.size(); ++i) {
+    const double log_prob = cands_[i].fmap.dot(params) - log_z;
+    const double prob = exp(log_prob);
+    const double e_logprob = prob * log_prob;
+    entropy -= e_logprob;
+    if (g) {
+      (*g) += cands_[i].fmap * e_logprob;
+      exp_feats += cands_[i].fmap * prob;
+    }
+  }
+  if (g) (*g) += exp_feats * entropy;
+  return entropy;
+}
+
+}
+
diff --git a/training/entropy.h b/training/entropy.h
new file mode 100644
index 00000000..796589ca
--- /dev/null
+++ b/training/entropy.h
@@ -0,0 +1,22 @@
+#ifndef _CSENTROPY_H_
+#define _CSENTROPY_H_
+
+#include <vector>
+#include "sparse_vector.h"
+
+namespace training {
+  class CandidateSet;
+
+  class CandidateSetEntropy {
+   public:
+    explicit CandidateSetEntropy(const CandidateSet& cs) : cands_(cs) {}
+    // compute the entropy (expected log likelihood) of a CandidateSet
+    // (optional) the gradient of the entropy with respect to params
+    double operator()(const std::vector<double>& params,
+                      SparseVector<double>* g = NULL) const;
+   private:
+    const CandidateSet& cands_;
+  };
+};
+
+#endif
diff --git a/utils/fdict.h b/utils/fdict.h
index 71547d2e..eb853fb2 100644
--- a/utils/fdict.h
+++ b/utils/fdict.h
@@ -33,6 +33,8 @@ struct FD {
     assert(dict_.max() == 0);  // dictionary must not have
                                // been added to
     hash_ = new PerfectHashFunction(cmph_file);
+#else
+    (void) cmph_file;
 #endif
   }
   static inline int NumFeats() {