fixed conflicts

17 files changed, 0 insertions, 2322 deletions

diff --git a/rst_parser/Makefile.am b/rst_parser/Makefile.am
deleted file mode 100644
index 8650cdab..00000000
--- a/rst_parser/Makefile.am
+++ /dev/null
@@ -1,20 +0,0 @@
-bin_PROGRAMS = \
-  mst_train rst_train rst_parse random_tree
-
-noinst_LIBRARIES = librst.a
-
-librst_a_SOURCES = arc_factored.cc arc_factored_marginals.cc rst.cc arc_ff.cc dep_training.cc global_ff.cc
-
-mst_train_SOURCES = mst_train.cc
-mst_train_LDADD = librst.a $(top_srcdir)/decoder/libcdec.a $(top_srcdir)/mteval/libmteval.a $(top_srcdir)/utils/libutils.a ../klm/lm/libklm.a ../klm/util/libklm_util.a ../training/optimize.o -lz
-
-rst_train_SOURCES = rst_train.cc
-rst_train_LDADD = librst.a $(top_srcdir)/decoder/libcdec.a $(top_srcdir)/mteval/libmteval.a $(top_srcdir)/utils/libutils.a ../klm/lm/libklm.a ../klm/util/libklm_util.a -lz
-
-rst_parse_SOURCES = rst_parse.cc
-rst_parse_LDADD = librst.a $(top_srcdir)/decoder/libcdec.a $(top_srcdir)/mteval/libmteval.a $(top_srcdir)/utils/libutils.a ../klm/lm/libklm.a ../klm/util/libklm_util.a -lz
-
-random_tree_SOURCES = random_tree.cc
-random_tree_LDADD = librst.a $(top_srcdir)/decoder/libcdec.a $(top_srcdir)/mteval/libmteval.a $(top_srcdir)/utils/libutils.a ../klm/lm/libklm.a ../klm/util/libklm_util.a -lz
-
-AM_CPPFLAGS = -W -Wall -Wno-sign-compare $(GTEST_CPPFLAGS) -I$(top_srcdir)/decoder -I$(top_srcdir)/training -I$(top_srcdir)/utils -I$(top_srcdir)/mteval -I../klm
diff --git a/rst_parser/arc_factored.cc b/rst_parser/arc_factored.cc
deleted file mode 100644
index 74bf7516..00000000
--- a/rst_parser/arc_factored.cc
+++ /dev/null
@@ -1,151 +0,0 @@
-#include "arc_factored.h"
-
-#include <set>
-#include <tr1/unordered_set>
-
-#include <boost/pending/disjoint_sets.hpp>
-#include <boost/functional/hash.hpp>
-
-#include "arc_ff.h"
-
-using namespace std;
-using namespace std::tr1;
-using namespace boost;
-
-void EdgeSubset::ExtractFeatures(const TaggedSentence& sentence,
-                                 const ArcFeatureFunctions& ffs,
-                                 SparseVector<double>* features) const {
-  SparseVector<weight_t> efmap;
-  for (int j = 0; j < h_m_pairs.size(); ++j) {
-    efmap.clear();
-    ffs.EdgeFeatures(sentence, h_m_pairs[j].first,
-                     h_m_pairs[j].second,
-                     &efmap);
-    (*features) += efmap;
-  }
-  for (int j = 0; j < roots.size(); ++j) {
-    efmap.clear();
-    ffs.EdgeFeatures(sentence, -1, roots[j], &efmap);
-    (*features) += efmap;
-  }
-}
-
-void ArcFactoredForest::ExtractFeatures(const TaggedSentence& sentence,
-                                        const ArcFeatureFunctions& ffs) {
-  for (int m = 0; m < num_words_; ++m) {
-    for (int h = 0; h < num_words_; ++h) {
-      ffs.EdgeFeatures(sentence, h, m, &edges_(h,m).features);
-    }
-    ffs.EdgeFeatures(sentence, -1, m, &root_edges_[m].features);
-  }
-}
-
-void ArcFactoredForest::PickBestParentForEachWord(EdgeSubset* st) const {
-  for (int m = 0; m < num_words_; ++m) {
-    int best_head = -2;
-    prob_t best_score;
-    for (int h = -1; h < num_words_; ++h) {
-      const Edge& edge = (*this)(h,m);
-      if (best_head < -1 || edge.edge_prob > best_score) {
-        best_score = edge.edge_prob;
-        best_head = h;
-      }
-    }
-    assert(best_head >= -1);
-    if (best_head >= 0)
-      st->h_m_pairs.push_back(make_pair<short,short>(best_head, m));
-    else
-      st->roots.push_back(m);
-  }
-}
-
-struct WeightedEdge {
-  WeightedEdge() : h(), m(), weight() {}
-  WeightedEdge(short hh, short mm, float w) : h(hh), m(mm), weight(w) {}
-  short h, m;
-  float weight;
-  inline bool operator==(const WeightedEdge& o) const {
-    return h == o.h && m == o.m && weight == o.weight;
-  }
-  inline bool operator!=(const WeightedEdge& o) const {
-    return h != o.h || m != o.m || weight != o.weight;
-  }
-};
-inline bool operator<(const WeightedEdge& l, const WeightedEdge& o) { return l.weight < o.weight; }
-inline size_t hash_value(const WeightedEdge& e) { return reinterpret_cast<const size_t&>(e); }
-
-
-struct PriorityQueue {
-  void push(const WeightedEdge& e) {}
-  const WeightedEdge& top() const {
-    static WeightedEdge w(1,2,3);
-    return w;
-  }
-  void pop() {}
-  void increment_all(float p) {}
-};
-
-// based on Trajan 1977
-void ArcFactoredForest::MaximumSpanningTree(EdgeSubset* st) const {
-  typedef disjoint_sets_with_storage<identity_property_map, identity_property_map,
-      find_with_full_path_compression> DisjointSet;
-  DisjointSet strongly(num_words_ + 1);
-  DisjointSet weakly(num_words_ + 1);
-  set<unsigned> roots, rset;
-  unordered_set<WeightedEdge, boost::hash<WeightedEdge> > h;
-  vector<PriorityQueue> qs(num_words_ + 1);
-  vector<WeightedEdge> enter(num_words_ + 1);
-  vector<unsigned> mins(num_words_ + 1);
-  const WeightedEdge kDUMMY(0,0,0.0f);
-  for (unsigned i = 0; i <= num_words_; ++i) {
-    if (i > 0) {
-      // I(i) incidence on i -- all incoming edges
-      for (unsigned j = 0; j <= num_words_; ++j) {
-        qs[i].push(WeightedEdge(j, i, Weight(j,i)));
-      }
-    }
-    strongly.make_set(i);
-    weakly.make_set(i);
-    roots.insert(i);
-    enter[i] = kDUMMY;
-    mins[i] = i;
-  }
-  while(!roots.empty()) {
-    set<unsigned>::iterator it = roots.begin();
-    const unsigned k = *it;
-    roots.erase(it);
-    cerr << "k=" << k << endl;
-    WeightedEdge ij = qs[k].top();  // MAX(k)
-    qs[k].pop();
-    if (ij.weight <= 0) {
-      rset.insert(k);
-    } else {
-      if (strongly.find_set(ij.h) == k) {
-        roots.insert(k);
-      } else {
-        h.insert(ij);
-        if (weakly.find_set(ij.h) != weakly.find_set(ij.m)) {
-          weakly.union_set(ij.h, ij.m);
-          enter[k] = ij;
-        } else {
-          unsigned vertex = 0;
-          float val = 99999999999;
-          WeightedEdge xy = ij;
-          while(xy != kDUMMY) {
-            if (xy.weight < val) {
-              val = xy.weight;
-              vertex = strongly.find_set(xy.m);
-            }
-            xy = enter[strongly.find_set(xy.h)];
-          }
-          qs[k].increment_all(val - ij.weight);
-          mins[k] = mins[vertex];
-          xy = enter[strongly.find_set(ij.h)];
-          while (xy != kDUMMY) {
-          }
-        }
-      }
-    }
-  }
-}
-
diff --git a/rst_parser/arc_factored.h b/rst_parser/arc_factored.h
deleted file mode 100644
index c5481d80..00000000
--- a/rst_parser/arc_factored.h
+++ /dev/null
@@ -1,124 +0,0 @@
-#ifndef _ARC_FACTORED_H_
-#define _ARC_FACTORED_H_
-
-#include <iostream>
-#include <cassert>
-#include <vector>
-#include <utility>
-#include <boost/shared_ptr.hpp>
-#include "array2d.h"
-#include "sparse_vector.h"
-#include "prob.h"
-#include "weights.h"
-#include "wordid.h"
-
-struct TaggedSentence {
-  std::vector<WordID> words;
-  std::vector<WordID> pos;
-};
-
-struct ArcFeatureFunctions;
-struct EdgeSubset {
-  EdgeSubset() {}
-  std::vector<short> roots; // unless multiroot trees are supported, this
-                            // will have a single member
-  std::vector<std::pair<short, short> > h_m_pairs; // h,m start at 0
-  // assumes ArcFeatureFunction::PrepareForInput has already been called
-  void ExtractFeatures(const TaggedSentence& sentence,
-                       const ArcFeatureFunctions& ffs,
-                       SparseVector<double>* features) const;
-};
-
-class ArcFactoredForest {
- public:
-  ArcFactoredForest() : num_words_() {}
-  explicit ArcFactoredForest(short num_words) : num_words_(num_words) {
-    resize(num_words);
-  }
-
-  unsigned size() const { return num_words_; }
-
-  void resize(unsigned num_words) {
-    num_words_ = num_words;
-    root_edges_.clear();
-    edges_.clear();
-    root_edges_.resize(num_words);
-    edges_.resize(num_words, num_words);
-    for (int h = 0; h < num_words; ++h) {
-      for (int m = 0; m < num_words; ++m) {
-        edges_(h, m).h = h;
-        edges_(h, m).m = m;
-      }
-      root_edges_[h].h = -1;
-      root_edges_[h].m = h;
-    }
-  }
-
-  // compute the maximum spanning tree based on the current weighting
-  // using the O(n^2) CLE algorithm
-  void MaximumSpanningTree(EdgeSubset* st) const;
-
-  // Reweight edges so that edge_prob is the edge's marginals
-  // optionally returns log partition
-  void EdgeMarginals(prob_t* p_log_z = NULL);
-
-  // This may not return a tree
-  void PickBestParentForEachWord(EdgeSubset* st) const;
-
-  struct Edge {
-    Edge() : h(), m(), features(), edge_prob(prob_t::Zero()) {}
-    short h;
-    short m;
-    SparseVector<weight_t> features;
-    prob_t edge_prob;
-  };
-
-  // set eges_[*].features
-  void ExtractFeatures(const TaggedSentence& sentence,
-                       const ArcFeatureFunctions& ffs);
-
-  const Edge& operator()(short h, short m) const {
-    return h >= 0 ? edges_(h, m) : root_edges_[m];
-  }
-
-  Edge& operator()(short h, short m) {
-    return h >= 0 ? edges_(h, m) : root_edges_[m];
-  }
-
-  float Weight(short h, short m) const {
-    return log((*this)(h,m).edge_prob);
-  }
-
-  template <class V>
-  void Reweight(const V& weights) {
-    for (int m = 0; m < num_words_; ++m) {
-      for (int h = 0; h < num_words_; ++h) {
-        if (h != m) {
-          Edge& e = edges_(h, m);
-          e.edge_prob.logeq(e.features.dot(weights));
-        }
-      }
-      Edge& e = root_edges_[m];
-      e.edge_prob.logeq(e.features.dot(weights));
-    }
-  }
-
- private:
-  int num_words_;
-  std::vector<Edge> root_edges_;
-  Array2D<Edge> edges_;
-};
-
-inline std::ostream& operator<<(std::ostream& os, const ArcFactoredForest::Edge& edge) {
-  return os << "(" << edge.h << " < " << edge.m << ")";
-}
-
-inline std::ostream& operator<<(std::ostream& os, const EdgeSubset& ss) {
-  for (unsigned i = 0; i < ss.roots.size(); ++i)
-    os << "ROOT < " << ss.roots[i] << std::endl;
-  for (unsigned i = 0; i < ss.h_m_pairs.size(); ++i)
-    os << ss.h_m_pairs[i].first << " < " << ss.h_m_pairs[i].second << std::endl;
-  return os;
-}
-
-#endif
diff --git a/rst_parser/arc_factored_marginals.cc b/rst_parser/arc_factored_marginals.cc
deleted file mode 100644
index 3e8c9f86..00000000
--- a/rst_parser/arc_factored_marginals.cc
+++ /dev/null
@@ -1,58 +0,0 @@
-#include "arc_factored.h"
-
-#include <iostream>
-
-#include "config.h"
-
-using namespace std;
-
-#if HAVE_EIGEN
-
-#include <Eigen/Dense>
-typedef Eigen::Matrix<prob_t, Eigen::Dynamic, Eigen::Dynamic> ArcMatrix;
-typedef Eigen::Matrix<prob_t, Eigen::Dynamic, 1> RootVector;
-
-void ArcFactoredForest::EdgeMarginals(prob_t *plog_z) {
-  ArcMatrix A(num_words_,num_words_);
-  RootVector r(num_words_);
-  for (int h = 0; h < num_words_; ++h) {
-    for (int m = 0; m < num_words_; ++m) {
-      if (h != m)
-        A(h,m) = edges_(h,m).edge_prob;
-      else
-        A(h,m) = prob_t::Zero();
-    }
-    r(h) = root_edges_[h].edge_prob;
-  }
-
-  ArcMatrix L = -A;
-  L.diagonal() = A.colwise().sum();
-  L.row(0) = r;
-  ArcMatrix Linv = L.inverse();
-  if (plog_z) *plog_z = Linv.determinant();
-  RootVector rootMarginals = r.cwiseProduct(Linv.col(0));
-  static const prob_t ZERO(0);
-  static const prob_t ONE(1);
-//  ArcMatrix T = Linv;
-  for (int h = 0; h < num_words_; ++h) {
-    for (int m = 0; m < num_words_; ++m) {
-      const prob_t marginal = (m == 0 ? ZERO : ONE) * A(h,m) * Linv(m,m) -
-                              (h == 0 ? ZERO : ONE) * A(h,m) * Linv(m,h);
-      edges_(h,m).edge_prob = marginal;
-//      T(h,m) = marginal;
-    }
-    root_edges_[h].edge_prob = rootMarginals(h);
-  }
-//   cerr << "ROOT MARGINALS: " << rootMarginals.transpose() << endl;
-//  cerr << "M:\n" << T << endl;
-}
-
-#else
-
-void ArcFactoredForest::EdgeMarginals(prob_t *) {
-  cerr << "EdgeMarginals() requires --with-eigen!\n";
-  abort();
-}
-
-#endif
-
diff --git a/rst_parser/arc_ff.cc b/rst_parser/arc_ff.cc
deleted file mode 100644
index c4e5aa17..00000000
--- a/rst_parser/arc_ff.cc
+++ /dev/null
@@ -1,183 +0,0 @@
-#include "arc_ff.h"
-
-#include <iostream>
-#include <sstream>
-
-#include "stringlib.h"
-#include "tdict.h"
-#include "fdict.h"
-#include "sentence_metadata.h"
-
-using namespace std;
-
-struct ArcFFImpl {
-  ArcFFImpl() : kROOT("ROOT"), kLEFT_POS("LEFT"), kRIGHT_POS("RIGHT") {}
-  const string kROOT;
-  const string kLEFT_POS;
-  const string kRIGHT_POS;
-  map<WordID, vector<int> > pcs;
-
-  void PrepareForInput(const TaggedSentence& sent) {
-    pcs.clear();
-    for (int i = 0; i < sent.pos.size(); ++i)
-      pcs[sent.pos[i]].resize(1, 0);
-    pcs[sent.pos[0]][0] = 1;
-    for (int i = 1; i < sent.pos.size(); ++i) {
-      const WordID posi = sent.pos[i];
-      for (map<WordID, vector<int> >::iterator j = pcs.begin(); j != pcs.end(); ++j) {
-        const WordID posj = j->first;
-        vector<int>& cs = j->second;
-        cs.push_back(cs.back() + (posj == posi ? 1 : 0));
-      }
-    }
-  }
-
-  template <typename A>
-  static void Fire(SparseVector<weight_t>* v, const A& a) {
-    ostringstream os;
-    os << a;
-    v->set_value(FD::Convert(os.str()), 1);
-  }
-
-  template <typename A, typename B>
-  static void Fire(SparseVector<weight_t>* v, const A& a, const B& b) {
-    ostringstream os;
-    os << a << ':' << b;
-    v->set_value(FD::Convert(os.str()), 1);
-  }
-
-  template <typename A, typename B, typename C>
-  static void Fire(SparseVector<weight_t>* v, const A& a, const B& b, const C& c) {
-    ostringstream os;
-    os << a << ':' << b << '_' << c;
-    v->set_value(FD::Convert(os.str()), 1);
-  }
-
-  template <typename A, typename B, typename C, typename D>
-  static void Fire(SparseVector<weight_t>* v, const A& a, const B& b, const C& c, const D& d) {
-    ostringstream os;
-    os << a << ':' << b << '_' << c << '_' << d;
-    v->set_value(FD::Convert(os.str()), 1);
-  }
-
-  template <typename A, typename B, typename C, typename D, typename E>
-  static void Fire(SparseVector<weight_t>* v, const A& a, const B& b, const C& c, const D& d, const E& e) {
-    ostringstream os;
-    os << a << ':' << b << '_' << c << '_' << d << '_' << e;
-    v->set_value(FD::Convert(os.str()), 1);
-  }
-
-  static void AddConjoin(const SparseVector<double>& v, const string& feat, SparseVector<double>* pf) {
-    for (SparseVector<double>::const_iterator it = v.begin(); it != v.end(); ++it)
-      pf->set_value(FD::Convert(FD::Convert(it->first) + "_" + feat), it->second);
-  }
-
-  static inline string Fixup(const string& str) {
-    string res = LowercaseString(str);
-    if (res.size() < 6) return res;
-    return res.substr(0, 5) + "*";
-  }
-
-  static inline string Suffix(const string& str) {
-    if (str.size() < 4) return ""; else return str.substr(str.size() - 3);
-  }
-
-  void EdgeFeatures(const TaggedSentence& sent,
-                    short h,
-                    short m,
-                    SparseVector<weight_t>* features) const {
-    const bool is_root = (h == -1);
-    const string head_word = (is_root ? kROOT : Fixup(TD::Convert(sent.words[h])));
-    int num_words = sent.words.size();
-    const string& head_pos = (is_root ? kROOT : TD::Convert(sent.pos[h]));
-    const string mod_word = Fixup(TD::Convert(sent.words[m]));
-    const string& mod_pos = TD::Convert(sent.pos[m]);
-    const string& mod_pos_L = (m > 0 ? TD::Convert(sent.pos[m-1]) : kLEFT_POS);
-    const string& mod_pos_R = (m < sent.pos.size() - 1 ? TD::Convert(sent.pos[m]) : kRIGHT_POS);
-    const bool bdir = m < h;
-    const string dir = (bdir ? "MLeft" : "MRight");
-    int v = m - h;
-    if (v < 0) {
-      v= -1 - int(log(-v) / log(1.6));
-    } else {
-      v= int(log(v) / log(1.6)) + 1;
-    }
-    ostringstream os;
-    if (v < 0) os << "LenL" << -v; else os << "LenR" << v;
-    const string lenstr = os.str();
-    Fire(features, dir);
-    Fire(features, lenstr);
-    // dir, lenstr
-    if (is_root) {
-      Fire(features, "wROOT", mod_word);
-      Fire(features, "pROOT", mod_pos);
-      Fire(features, "wpROOT", mod_word, mod_pos);
-      Fire(features, "DROOT", mod_pos, lenstr);
-      Fire(features, "LROOT", mod_pos_L);
-      Fire(features, "RROOT", mod_pos_R);
-      Fire(features, "LROOT", mod_pos_L, mod_pos);
-      Fire(features, "RROOT", mod_pos_R, mod_pos);
-      Fire(features, "LDist", m);
-      Fire(features, "RDist", num_words - m);
-    } else { // not root
-      const string& head_pos_L = (h > 0 ? TD::Convert(sent.pos[h-1]) : kLEFT_POS);
-      const string& head_pos_R = (h < sent.pos.size() - 1 ? TD::Convert(sent.pos[h]) : kRIGHT_POS);
-      SparseVector<double> fv;
-      SparseVector<double>* f = &fv;
-      Fire(f, "H", head_pos);
-      Fire(f, "M", mod_pos);
-      Fire(f, "HM", head_pos, mod_pos);
-
-      // surrounders
-      Fire(f, "posLL", head_pos, mod_pos, head_pos_L, mod_pos_L);
-      Fire(f, "posRR", head_pos, mod_pos, head_pos_R, mod_pos_R);
-      Fire(f, "posLR", head_pos, mod_pos, head_pos_L, mod_pos_R);
-      Fire(f, "posRL", head_pos, mod_pos, head_pos_R, mod_pos_L);
-
-      // between features
-      int left = min(h,m);
-      int right = max(h,m);
-      if (right - left >= 2) {
-        if (bdir) --right; else ++left;
-        for (map<WordID, vector<int> >::const_iterator it = pcs.begin(); it != pcs.end(); ++it) {
-          if (it->second[left] != it->second[right]) {
-            Fire(f, "BT", head_pos, TD::Convert(it->first), mod_pos);
-          }
-        }
-      }
-
-      Fire(f, "wH", head_word);
-      Fire(f, "wM", mod_word);
-      Fire(f, "wpH", head_word, head_pos);
-      Fire(f, "wpM", mod_word, mod_pos);
-      Fire(f, "pHwM", head_pos, mod_word);
-      Fire(f, "wHpM", head_word, mod_pos);
-
-      Fire(f, "wHM", head_word, mod_word);
-      Fire(f, "pHMwH", head_pos, mod_pos, head_word);
-      Fire(f, "pHMwM", head_pos, mod_pos, mod_word);
-      Fire(f, "wHMpH", head_word, mod_word, head_pos);
-      Fire(f, "wHMpM", head_word, mod_word, mod_pos);
-      Fire(f, "wHMpHM", head_word, mod_word, head_pos, mod_pos);
-
-      AddConjoin(fv, dir, features);
-      AddConjoin(fv, lenstr, features);
-      (*features) += fv;
-    }
-  }
-};
-
-ArcFeatureFunctions::ArcFeatureFunctions() : pimpl(new ArcFFImpl) {}
-ArcFeatureFunctions::~ArcFeatureFunctions() { delete pimpl; }
-
-void ArcFeatureFunctions::PrepareForInput(const TaggedSentence& sentence) {
-  pimpl->PrepareForInput(sentence);
-}
-
-void ArcFeatureFunctions::EdgeFeatures(const TaggedSentence& sentence,
-                                       short h,
-                                       short m,
-                                       SparseVector<weight_t>* features) const {
-  pimpl->EdgeFeatures(sentence, h, m, features);
-}
-
diff --git a/rst_parser/arc_ff.h b/rst_parser/arc_ff.h
deleted file mode 100644
index 52f311d2..00000000
--- a/rst_parser/arc_ff.h
+++ /dev/null
@@ -1,28 +0,0 @@
-#ifndef _ARC_FF_H_
-#define _ARC_FF_H_
-
-#include <string>
-#include "sparse_vector.h"
-#include "weights.h"
-#include "arc_factored.h"
-
-struct TaggedSentence;
-struct ArcFFImpl;
-class ArcFeatureFunctions {
- public:
-  ArcFeatureFunctions();
-  ~ArcFeatureFunctions();
-
-  // called once, per input, before any calls to EdgeFeatures
-  // used to initialize sentence-specific data structures
-  void PrepareForInput(const TaggedSentence& sentence);
-
-  void EdgeFeatures(const TaggedSentence& sentence,
-                    short h,
-                    short m,
-                    SparseVector<weight_t>* features) const;
- private:
-  ArcFFImpl* pimpl;
-};
-
-#endif
diff --git a/rst_parser/dep_training.cc b/rst_parser/dep_training.cc
deleted file mode 100644
index ef97798b..00000000
--- a/rst_parser/dep_training.cc
+++ /dev/null
@@ -1,76 +0,0 @@
-#include "dep_training.h"
-
-#include <vector>
-#include <iostream>
-
-#include "stringlib.h"
-#include "filelib.h"
-#include "tdict.h"
-#include "picojson.h"
-
-using namespace std;
-
-static void ParseInstance(const string& line, int start, TrainingInstance* out, int lc = 0) {
-  picojson::value obj;
-  string err;
-  picojson::parse(obj, line.begin() + start, line.end(), &err);
-  if (err.size() > 0) { cerr << "JSON parse error in " << lc << ": " << err << endl; abort(); }
-  TrainingInstance& cur = *out;
-  TaggedSentence& ts = cur.ts;
-  EdgeSubset& tree = cur.tree;
-  ts.pos.clear();
-  ts.words.clear();
-  tree.roots.clear();
-  tree.h_m_pairs.clear();
-  assert(obj.is<picojson::object>());
-  const picojson::object& d = obj.get<picojson::object>();
-  const picojson::array& ta = d.find("tokens")->second.get<picojson::array>();
-  for (unsigned i = 0; i < ta.size(); ++i) {
-    ts.words.push_back(TD::Convert(ta[i].get<picojson::array>()[0].get<string>()));
-    ts.pos.push_back(TD::Convert(ta[i].get<picojson::array>()[1].get<string>()));
-  }
-  if (d.find("deps") != d.end()) {
-    const picojson::array& da = d.find("deps")->second.get<picojson::array>();
-    for (unsigned i = 0; i < da.size(); ++i) {
-      const picojson::array& thm = da[i].get<picojson::array>();
-      // get dep type here
-      short h = thm[2].get<double>();
-      short m = thm[1].get<double>();
-      if (h < 0)
-        tree.roots.push_back(m);
-      else
-        tree.h_m_pairs.push_back(make_pair(h,m));
-    }
-  }
-  //cerr << TD::GetString(ts.words) << endl << TD::GetString(ts.pos) << endl << tree << endl;
-}
-
-bool TrainingInstance::ReadInstance(std::istream* in, TrainingInstance* instance) {
-  string line;
-  if (!getline(*in, line)) return false;
-  size_t pos = line.rfind('\t');
-  assert(pos != string::npos);
-  static int lc = 0; ++lc;
-  ParseInstance(line, pos + 1, instance, lc);
-  return true;
-}
-
-void TrainingInstance::ReadTrainingCorpus(const string& fname, vector<TrainingInstance>* corpus, int rank, int size) {
-  ReadFile rf(fname);
-  istream& in = *rf.stream();
-  string line;
-  int lc = 0;
-  bool flag = false;
-  while(getline(in, line)) {
-    ++lc;
-    if ((lc-1) % size != rank) continue;
-    if (rank == 0 && lc % 10 == 0) { cerr << '.' << flush; flag = true; }
-    if (rank == 0 && lc % 400 == 0) { cerr << " [" << lc << "]\n"; flag = false; }
-    size_t pos = line.rfind('\t');
-    assert(pos != string::npos);
-    corpus->push_back(TrainingInstance());
-    ParseInstance(line, pos + 1, &corpus->back(), lc);
-  }
-  if (flag) cerr << "\nRead " << lc << " training instances\n";
-}
-
diff --git a/rst_parser/dep_training.h b/rst_parser/dep_training.h
deleted file mode 100644
index 3eeee22e..00000000
--- a/rst_parser/dep_training.h
+++ /dev/null
@@ -1,19 +0,0 @@
-#ifndef _DEP_TRAINING_H_
-#define _DEP_TRAINING_H_
-
-#include <iostream>
-#include <string>
-#include <vector>
-#include "arc_factored.h"
-#include "weights.h"
-
-struct TrainingInstance {
-  TaggedSentence ts;
-  EdgeSubset tree;
-  SparseVector<weight_t> features;
-  // reads a "Jsent" formatted dependency file
-  static bool ReadInstance(std::istream* in, TrainingInstance* instance); // returns false at EOF
-  static void ReadTrainingCorpus(const std::string& fname, std::vector<TrainingInstance>* corpus, int rank = 0, int size = 1);
-};
-
-#endif
diff --git a/rst_parser/global_ff.cc b/rst_parser/global_ff.cc
deleted file mode 100644
index ae410875..00000000
--- a/rst_parser/global_ff.cc
+++ /dev/null
@@ -1,44 +0,0 @@
-#include "global_ff.h"
-
-#include <iostream>
-#include <sstream>
-
-#include "tdict.h"
-
-using namespace std;
-
-struct GFFImpl {
-  void PrepareForInput(const TaggedSentence& sentence) {
-  }
-  void Features(const TaggedSentence& sentence,
-                const EdgeSubset& tree,
-                SparseVector<double>* feats) const {
-    const vector<WordID>& words = sentence.words;
-    const vector<WordID>& tags = sentence.pos;
-    const vector<pair<short,short> >& hms = tree.h_m_pairs;
-    assert(words.size() == tags.size());
-    vector<int> mods(words.size());
-    for (int i = 0; i < hms.size(); ++i) {
-      mods[hms[i].first]++;        // first = head, second = modifier
-    }
-    for (int i = 0; i < mods.size(); ++i) {
-      ostringstream os;
-      os << "NM:" << TD::Convert(tags[i]) << "_" << mods[i];
-      feats->add_value(FD::Convert(os.str()), 1.0);
-    }
-  }
-};
-
-GlobalFeatureFunctions::GlobalFeatureFunctions() : pimpl(new GFFImpl) {}
-GlobalFeatureFunctions::~GlobalFeatureFunctions() { delete pimpl; }
-
-void GlobalFeatureFunctions::PrepareForInput(const TaggedSentence& sentence) {
-  pimpl->PrepareForInput(sentence);
-}
-
-void GlobalFeatureFunctions::Features(const TaggedSentence& sentence,
-                                      const EdgeSubset& tree,
-                                      SparseVector<double>* feats) const {
-  pimpl->Features(sentence, tree, feats);
-}
-
diff --git a/rst_parser/global_ff.h b/rst_parser/global_ff.h
deleted file mode 100644
index d71d0fa1..00000000
--- a/rst_parser/global_ff.h
+++ /dev/null
@@ -1,18 +0,0 @@
-#ifndef _GLOBAL_FF_H_
-#define _GLOBAL_FF_H_
-
-#include "arc_factored.h"
-
-struct GFFImpl;
-struct GlobalFeatureFunctions {
-  GlobalFeatureFunctions();
-  ~GlobalFeatureFunctions();
-  void PrepareForInput(const TaggedSentence& sentence);
-  void Features(const TaggedSentence& sentence,
-                const EdgeSubset& tree,
-                SparseVector<double>* feats) const;
- private:
-  GFFImpl* pimpl;
-};
-
-#endif
diff --git a/rst_parser/mst_train.cc b/rst_parser/mst_train.cc
deleted file mode 100644
index a78df600..00000000
--- a/rst_parser/mst_train.cc
+++ /dev/null
@@ -1,228 +0,0 @@
-#include "arc_factored.h"
-
-#include <vector>
-#include <iostream>
-#include <boost/program_options.hpp>
-#include <boost/program_options/variables_map.hpp>
-// #define HAVE_THREAD 1
-#if HAVE_THREAD
-#include <boost/thread.hpp>
-#endif
-
-#include "arc_ff.h"
-#include "stringlib.h"
-#include "filelib.h"
-#include "tdict.h"
-#include "dep_training.h"
-#include "optimize.h"
-#include "weights.h"
-
-using namespace std;
-namespace po = boost::program_options;
-
-void InitCommandLine(int argc, char** argv, po::variables_map* conf) {
-  po::options_description opts("Configuration options");
-  string cfg_file;
-  opts.add_options()
-        ("training_data,t",po::value<string>()->default_value("-"), "File containing training data (jsent format)")
-        ("weights,w",po::value<string>(), "Optional starting weights")
-        ("output_every_i_iterations,I",po::value<unsigned>()->default_value(1), "Write weights every I iterations")
-        ("regularization_strength,C",po::value<double>()->default_value(1.0), "Regularization strength")
-#ifdef HAVE_CMPH
-        ("cmph_perfect_feature_hash,h", po::value<string>(), "Load perfect hash function for features")
-#endif
-#if HAVE_THREAD
-        ("threads,T",po::value<unsigned>()->default_value(1), "Number of threads")
-#endif
-        ("correction_buffers,m", po::value<int>()->default_value(10), "LBFGS correction buffers");
-  po::options_description clo("Command line options");
-  clo.add_options()
-        ("config,c", po::value<string>(&cfg_file), "Configuration file")
-        ("help,?", "Print this help message and exit");
-
-  po::options_description dconfig_options, dcmdline_options;
-  dconfig_options.add(opts);
-  dcmdline_options.add(dconfig_options).add(clo);
-  po::store(parse_command_line(argc, argv, dcmdline_options), *conf);
-  if (cfg_file.size() > 0) {
-    ReadFile rf(cfg_file);
-    po::store(po::parse_config_file(*rf.stream(), dconfig_options), *conf);
-  }
-  if (conf->count("help")) {
-    cerr << dcmdline_options << endl;
-    exit(1);
-  }
-}
-
-void AddFeatures(double prob, const SparseVector<double>& fmap, vector<double>* g) {
-  for (SparseVector<double>::const_iterator it = fmap.begin(); it != fmap.end(); ++it)
-    (*g)[it->first] += it->second * prob;
-}
-
-double ApplyRegularizationTerms(const double C,
-                                const vector<double>& weights,
-                                vector<double>* g) {
-  assert(weights.size() == g->size());
-  double reg = 0;
-  for (size_t i = 0; i < weights.size(); ++i) {
-//    const double prev_w_i = (i < prev_weights.size() ? prev_weights[i] : 0.0);
-    const double& w_i = weights[i];
-    double& g_i = (*g)[i];
-    reg += C * w_i * w_i;
-    g_i += 2 * C * w_i;
-
-//    reg += T * (w_i - prev_w_i) * (w_i - prev_w_i);
-//    g_i += 2 * T * (w_i - prev_w_i);
-  }
-  return reg;
-}
-
-struct GradientWorker {
-  GradientWorker(int f,
-                 int t,
-                 vector<double>* w,
-                 vector<TrainingInstance>* c,
-                 vector<ArcFactoredForest>* fs) : obj(), weights(*w), from(f), to(t), corpus(*c), forests(*fs), g(w->size()) {}
-  void operator()() {
-    int every = (to - from) / 20;
-    if (!every) every++;
-    for (int i = from; i < to; ++i) {
-      if ((from == 0) && (i + 1) % every == 0) cerr << '.' << flush;
-      const int num_words = corpus[i].ts.words.size();
-      forests[i].Reweight(weights);
-      prob_t z;
-      forests[i].EdgeMarginals(&z);
-      obj -= log(z);
-      //cerr << " O = " << (-corpus[i].features.dot(weights)) << " D=" << -lz << "  OO= " << (-corpus[i].features.dot(weights) - lz) << endl;
-      //cerr << " ZZ = " << zz << endl;
-      for (int h = -1; h < num_words; ++h) {
-        for (int m = 0; m < num_words; ++m) {
-          if (h == m) continue;
-          const ArcFactoredForest::Edge& edge = forests[i](h,m);
-          const SparseVector<weight_t>& fmap = edge.features;
-          double prob = edge.edge_prob.as_float();
-          if (prob < -0.000001) { cerr << "Prob < 0: " << prob << endl; prob = 0; }
-          if (prob > 1.000001) { cerr << "Prob > 1: " << prob << endl; prob = 1; }
-          AddFeatures(prob, fmap, &g);
-          //mfm += fmap * prob;  // DE
-        }
-      }
-    }
-  }
-  double obj;
-  vector<double>& weights;
-  const int from, to;
-  vector<TrainingInstance>& corpus;
-  vector<ArcFactoredForest>& forests;
-  vector<double> g; // local gradient
-};
-
-int main(int argc, char** argv) {
-  int rank = 0;
-  int size = 1;
-  po::variables_map conf;
-  InitCommandLine(argc, argv, &conf);
-  if (conf.count("cmph_perfect_feature_hash")) {
-    cerr << "Loading perfect hash function from " << conf["cmph_perfect_feature_hash"].as<string>() << " ...\n";
-    FD::EnableHash(conf["cmph_perfect_feature_hash"].as<string>());
-    cerr << "  " << FD::NumFeats() << " features in map\n";
-  }
-  ArcFeatureFunctions ffs;
-  vector<TrainingInstance> corpus;
-  TrainingInstance::ReadTrainingCorpus(conf["training_data"].as<string>(), &corpus, rank, size);
-  vector<weight_t> weights;
-    Weights::InitFromFile(conf["weights"].as<string>(), &weights);
-  vector<ArcFactoredForest> forests(corpus.size());
-  SparseVector<double> empirical;
-  cerr << "Extracting features...\n";
-  bool flag = false;
-  for (int i = 0; i < corpus.size(); ++i) {
-    TrainingInstance& cur = corpus[i];
-    if (rank == 0 && (i+1) % 10 == 0) { cerr << '.' << flush; flag = true; }
-    if (rank == 0 && (i+1) % 400 == 0) { cerr << " [" << (i+1) << "]\n"; flag = false; }
-    ffs.PrepareForInput(cur.ts);
-    SparseVector<weight_t> efmap;
-    for (int j = 0; j < cur.tree.h_m_pairs.size(); ++j) {
-      efmap.clear();
-      ffs.EdgeFeatures(cur.ts, cur.tree.h_m_pairs[j].first,
-                       cur.tree.h_m_pairs[j].second,
-                       &efmap);
-      cur.features += efmap;
-    }
-    for (int j = 0; j < cur.tree.roots.size(); ++j) {
-      efmap.clear();
-      ffs.EdgeFeatures(cur.ts, -1, cur.tree.roots[j], &efmap);
-      cur.features += efmap;
-    }
-    empirical += cur.features;
-    forests[i].resize(cur.ts.words.size());
-    forests[i].ExtractFeatures(cur.ts, ffs);
-  }
-  if (flag) cerr << endl;
-  //cerr << "EMP: " << empirical << endl; //DE
-  weights.resize(FD::NumFeats(), 0.0);
-  vector<weight_t> g(FD::NumFeats(), 0.0);
-  cerr << "features initialized\noptimizing...\n";
-  boost::shared_ptr<BatchOptimizer> o;
-#if HAVE_THREAD
-  unsigned threads = conf["threads"].as<unsigned>();
-  if (threads > corpus.size()) threads = corpus.size();
-#else
-  const unsigned threads = 1;
-#endif
-  int chunk = corpus.size() / threads;
-  o.reset(new LBFGSOptimizer(g.size(), conf["correction_buffers"].as<int>()));
-  int iterations = 1000;
-  for (int iter = 0; iter < iterations; ++iter) {
-    cerr << "ITERATION " << iter << " " << flush;
-    fill(g.begin(), g.end(), 0.0);
-    for (SparseVector<double>::iterator it = empirical.begin(); it != empirical.end(); ++it)
-      g[it->first] = -it->second;
-    double obj = -empirical.dot(weights);
-    vector<boost::shared_ptr<GradientWorker> > jobs;
-    for (int from = 0; from < corpus.size(); from += chunk) {
-      int to = from + chunk;
-      if (to > corpus.size()) to = corpus.size();
-      jobs.push_back(boost::shared_ptr<GradientWorker>(new GradientWorker(from, to, &weights, &corpus, &forests)));
-    }
-#if HAVE_THREAD
-    boost::thread_group tg;
-    for (int i = 0; i < threads; ++i)
-      tg.create_thread(boost::ref(*jobs[i]));
-    tg.join_all();
-#else
-    (*jobs[0])();
-#endif
-    for (int i = 0; i < threads; ++i) {
-      obj += jobs[i]->obj;
-      vector<double>& tg = jobs[i]->g;
-      for (unsigned j = 0; j < g.size(); ++j)
-        g[j] += tg[j];
-    }
-    // SparseVector<double> mfm;  //DE
-    //cerr << endl << "E: " << empirical << endl;  // DE
-    //cerr << "M: " << mfm << endl;  // DE
-    double r = ApplyRegularizationTerms(conf["regularization_strength"].as<double>(), weights, &g);
-    double gnorm = 0;
-    for (int i = 0; i < g.size(); ++i)
-      gnorm += g[i]*g[i];
-    ostringstream ll;
-    ll << "ITER=" << (iter+1) << "\tOBJ=" << (obj+r) << "\t[F=" << obj << " R=" << r << "]\tGnorm=" << sqrt(gnorm);
-    cerr << ' ' << ll.str().substr(ll.str().find('\t')+1) << endl;
-    obj += r;
-    assert(obj >= 0);
-    o->Optimize(obj, g, &weights);
-    Weights::ShowLargestFeatures(weights);
-    const bool converged = o->HasConverged();
-    const char* ofname = converged ? "weights.final.gz" : "weights.cur.gz";
-    if (converged || ((iter+1) % conf["output_every_i_iterations"].as<unsigned>()) == 0) {
-      cerr << "writing..." << flush;
-      const string sl = ll.str();
-      Weights::WriteToFile(ofname, weights, true, &sl);
-      cerr << "done" << endl;
-    }
-    if (converged) { cerr << "CONVERGED\n"; break; }
-  }
-  return 0;
-}
-
diff --git a/rst_parser/picojson.h b/rst_parser/picojson.h
deleted file mode 100644
index bdb26057..00000000
--- a/rst_parser/picojson.h
+++ /dev/null
@@ -1,979 +0,0 @@
-/*
- * Copyright 2009-2010 Cybozu Labs, Inc.
- * Copyright 2011 Kazuho Oku
- * 
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- * 
- * 1. Redistributions of source code must retain the above copyright notice,
- *    this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- *    this list of conditions and the following disclaimer in the documentation
- *    and/or other materials provided with the distribution.
- * 
- * THIS SOFTWARE IS PROVIDED BY CYBOZU LABS, INC. ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
- * EVENT SHALL CYBOZU LABS, INC. OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
- * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- * 
- * The views and conclusions contained in the software and documentation are
- * those of the authors and should not be interpreted as representing official
- * policies, either expressed or implied, of Cybozu Labs, Inc.
- *
- */
-#ifndef picojson_h
-#define picojson_h
-
-#include <cassert>
-#include <cmath>
-#include <cstdio>
-#include <cstdlib>
-#include <cstring>
-#include <iostream>
-#include <iterator>
-#include <map>
-#include <string>
-#include <vector>
-
-#ifdef _MSC_VER
-    #define SNPRINTF _snprintf_s
-    #pragma warning(push)
-    #pragma warning(disable : 4244) // conversion from int to char
-#else
-    #define SNPRINTF snprintf
-#endif
-
-namespace picojson {
-  
-  enum {
-    null_type,
-    boolean_type,
-    number_type,
-    string_type,
-    array_type,
-    object_type
-  };
-  
-  struct null {};
-  
-  class value {
-  public:
-    typedef std::vector<value> array;
-    typedef std::map<std::string, value> object;
-  protected:
-    int type_;
-    union {
-      bool boolean_;
-      double number_;
-      std::string* string_;
-      array* array_;
-      object* object_;
-    };
-  public:
-    value();
-    value(int type, bool);
-    explicit value(bool b);
-    explicit value(double n);
-    explicit value(const std::string& s);
-    explicit value(const array& a);
-    explicit value(const object& o);
-    explicit value(const char* s);
-    value(const char* s, size_t len);
-    ~value();
-    value(const value& x);
-    value& operator=(const value& x);
-    template <typename T> bool is() const;
-    template <typename T> const T& get() const;
-    template <typename T> T& get();
-    bool evaluate_as_boolean() const;
-    const value& get(size_t idx) const;
-    const value& get(const std::string& key) const;
-    bool contains(size_t idx) const;
-    bool contains(const std::string& key) const;
-    std::string to_str() const;
-    template <typename Iter> void serialize(Iter os) const;
-    std::string serialize() const;
-  private:
-    template <typename T> value(const T*); // intentionally defined to block implicit conversion of pointer to bool
-  };
-  
-  typedef value::array array;
-  typedef value::object object;
-  
-  inline value::value() : type_(null_type) {}
-  
-  inline value::value(int type, bool) : type_(type) {
-    switch (type) {
-#define INIT(p, v) case p##type: p = v; break
-      INIT(boolean_, false);
-      INIT(number_, 0.0);
-      INIT(string_, new std::string());
-      INIT(array_, new array());
-      INIT(object_, new object());
-#undef INIT
-    default: break;
-    }
-  }
-  
-  inline value::value(bool b) : type_(boolean_type) {
-    boolean_ = b;
-  }
-  
-  inline value::value(double n) : type_(number_type) {
-    number_ = n;
-  }
-  
-  inline value::value(const std::string& s) : type_(string_type) {
-    string_ = new std::string(s);
-  }
-  
-  inline value::value(const array& a) : type_(array_type) {
-    array_ = new array(a);
-  }
-  
-  inline value::value(const object& o) : type_(object_type) {
-    object_ = new object(o);
-  }
-  
-  inline value::value(const char* s) : type_(string_type) {
-    string_ = new std::string(s);
-  }
-  
-  inline value::value(const char* s, size_t len) : type_(string_type) {
-    string_ = new std::string(s, len);
-  }
-  
-  inline value::~value() {
-    switch (type_) {
-#define DEINIT(p) case p##type: delete p; break
-      DEINIT(string_);
-      DEINIT(array_);
-      DEINIT(object_);
-#undef DEINIT
-    default: break;
-    }
-  }
-  
-  inline value::value(const value& x) : type_(x.type_) {
-    switch (type_) {
-#define INIT(p, v) case p##type: p = v; break
-      INIT(boolean_, x.boolean_);
-      INIT(number_, x.number_);
-      INIT(string_, new std::string(*x.string_));
-      INIT(array_, new array(*x.array_));
-      INIT(object_, new object(*x.object_));
-#undef INIT
-    default: break;
-    }
-  }
-  
-  inline value& value::operator=(const value& x) {
-    if (this != &x) {
-      this->~value();
-      new (this) value(x);
-    }
-    return *this;
-  }
-  
-#define IS(ctype, jtype)			     \
-  template <> inline bool value::is<ctype>() const { \
-    return type_ == jtype##_type;		     \
-  }
-  IS(null, null)
-  IS(bool, boolean)
-  IS(int, number)
-  IS(double, number)
-  IS(std::string, string)
-  IS(array, array)
-  IS(object, object)
-#undef IS
-  
-#define GET(ctype, var)						\
-  template <> inline const ctype& value::get<ctype>() const {	\
-    assert("type mismatch! call vis<type>() before get<type>()" \
-	   && is<ctype>());				        \
-    return var;							\
-  }								\
-  template <> inline ctype& value::get<ctype>() {		\
-    assert("type mismatch! call is<type>() before get<type>()"	\
-	   && is<ctype>());					\
-    return var;							\
-  }
-  GET(bool, boolean_)
-  GET(double, number_)
-  GET(std::string, *string_)
-  GET(array, *array_)
-  GET(object, *object_)
-#undef GET
-  
-  inline bool value::evaluate_as_boolean() const {
-    switch (type_) {
-    case null_type:
-      return false;
-    case boolean_type:
-      return boolean_;
-    case number_type:
-      return number_ != 0;
-    case string_type:
-      return ! string_->empty();
-    default:
-      return true;
-    }
-  }
-  
-  inline const value& value::get(size_t idx) const {
-    static value s_null;
-    assert(is<array>());
-    return idx < array_->size() ? (*array_)[idx] : s_null;
-  }
-
-  inline const value& value::get(const std::string& key) const {
-    static value s_null;
-    assert(is<object>());
-    object::const_iterator i = object_->find(key);
-    return i != object_->end() ? i->second : s_null;
-  }
-
-  inline bool value::contains(size_t idx) const {
-    assert(is<array>());
-    return idx < array_->size();
-  }
-
-  inline bool value::contains(const std::string& key) const {
-    assert(is<object>());
-    object::const_iterator i = object_->find(key);
-    return i != object_->end();
-  }
-  
-  inline std::string value::to_str() const {
-    switch (type_) {
-    case null_type:      return "null";
-    case boolean_type:   return boolean_ ? "true" : "false";
-    case number_type:    {
-      char buf[256];
-      double tmp;
-      SNPRINTF(buf, sizeof(buf), modf(number_, &tmp) == 0 ? "%.f" : "%f", number_);
-      return buf;
-    }
-    case string_type:    return *string_;
-    case array_type:     return "array";
-    case object_type:    return "object";
-    default:             assert(0);
-#ifdef _MSC_VER
-      __assume(0);
-#endif
-    }
-  }
-  
-  template <typename Iter> void copy(const std::string& s, Iter oi) {
-    std::copy(s.begin(), s.end(), oi);
-  }
-  
-  template <typename Iter> void serialize_str(const std::string& s, Iter oi) {
-    *oi++ = '"';
-    for (std::string::const_iterator i = s.begin(); i != s.end(); ++i) {
-      switch (*i) {
-#define MAP(val, sym) case val: copy(sym, oi); break
-	MAP('"', "\\\"");
-	MAP('\\', "\\\\");
-	MAP('/', "\\/");
-	MAP('\b', "\\b");
-	MAP('\f', "\\f");
-	MAP('\n', "\\n");
-	MAP('\r', "\\r");
-	MAP('\t', "\\t");
-#undef MAP
-      default:
-	if ((unsigned char)*i < 0x20 || *i == 0x7f) {
-	  char buf[7];
-	  SNPRINTF(buf, sizeof(buf), "\\u%04x", *i & 0xff);
-	  copy(buf, buf + 6, oi);
-	  } else {
-	  *oi++ = *i;
-	}
-	break;
-      }
-    }
-    *oi++ = '"';
-  }
-  
-  template <typename Iter> void value::serialize(Iter oi) const {
-    switch (type_) {
-    case string_type:
-      serialize_str(*string_, oi);
-      break;
-    case array_type: {
-      *oi++ = '[';
-      for (array::const_iterator i = array_->begin(); i != array_->end(); ++i) {
-	if (i != array_->begin()) {
-	  *oi++ = ',';
-	}
-	i->serialize(oi);
-      }
-      *oi++ = ']';
-      break;
-    }
-    case object_type: {
-      *oi++ = '{';
-      for (object::const_iterator i = object_->begin();
-	   i != object_->end();
-	   ++i) {
-	if (i != object_->begin()) {
-	  *oi++ = ',';
-	}
-	serialize_str(i->first, oi);
-	*oi++ = ':';
-	i->second.serialize(oi);
-      }
-      *oi++ = '}';
-      break;
-    }
-    default:
-      copy(to_str(), oi);
-      break;
-    }
-  }
-  
-  inline std::string value::serialize() const {
-    std::string s;
-    serialize(std::back_inserter(s));
-    return s;
-  }
-  
-  template <typename Iter> class input {
-  protected:
-    Iter cur_, end_;
-    int last_ch_;
-    bool ungot_;
-    int line_;
-  public:
-    input(const Iter& first, const Iter& last) : cur_(first), end_(last), last_ch_(-1), ungot_(false), line_(1) {}
-    int getc() {
-      if (ungot_) {
-	ungot_ = false;
-	return last_ch_;
-      }
-      if (cur_ == end_) {
-	last_ch_ = -1;
-	return -1;
-      }
-      if (last_ch_ == '\n') {
-	line_++;
-      }
-      last_ch_ = *cur_++ & 0xff;
-      return last_ch_;
-    }
-    void ungetc() {
-      if (last_ch_ != -1) {
-	assert(! ungot_);
-	ungot_ = true;
-      }
-    }
-    Iter cur() const { return cur_; }
-    int line() const { return line_; }
-    void skip_ws() {
-      while (1) {
-	int ch = getc();
-	if (! (ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r')) {
-	  ungetc();
-	  break;
-	}
-      }
-    }
-    int expect(int expect) {
-      skip_ws();
-      if (getc() != expect) {
-	ungetc();
-	return false;
-      }
-      return true;
-    }
-    bool match(const std::string& pattern) {
-      for (std::string::const_iterator pi(pattern.begin());
-	   pi != pattern.end();
-	   ++pi) {
-	if (getc() != *pi) {
-	  ungetc();
-	  return false;
-	}
-      }
-      return true;
-    }
-  };
-  
-  template<typename Iter> inline int _parse_quadhex(input<Iter> &in) {
-    int uni_ch = 0, hex;
-    for (int i = 0; i < 4; i++) {
-      if ((hex = in.getc()) == -1) {
-	return -1;
-      }
-      if ('0' <= hex && hex <= '9') {
-	hex -= '0';
-      } else if ('A' <= hex && hex <= 'F') {
-	hex -= 'A' - 0xa;
-      } else if ('a' <= hex && hex <= 'f') {
-	hex -= 'a' - 0xa;
-      } else {
-	in.ungetc();
-	return -1;
-      }
-      uni_ch = uni_ch * 16 + hex;
-    }
-    return uni_ch;
-  }
-  
-  template<typename String, typename Iter> inline bool _parse_codepoint(String& out, input<Iter>& in) {
-    int uni_ch;
-    if ((uni_ch = _parse_quadhex(in)) == -1) {
-      return false;
-    }
-    if (0xd800 <= uni_ch && uni_ch <= 0xdfff) {
-      if (0xdc00 <= uni_ch) {
-	// a second 16-bit of a surrogate pair appeared
-	return false;
-      }
-      // first 16-bit of surrogate pair, get the next one
-      if (in.getc() != '\\' || in.getc() != 'u') {
-	in.ungetc();
-	return false;
-      }
-      int second = _parse_quadhex(in);
-      if (! (0xdc00 <= second && second <= 0xdfff)) {
-	return false;
-      }
-      uni_ch = ((uni_ch - 0xd800) << 10) | ((second - 0xdc00) & 0x3ff);
-      uni_ch += 0x10000;
-    }
-    if (uni_ch < 0x80) {
-      out.push_back(uni_ch);
-    } else {
-      if (uni_ch < 0x800) {
-	out.push_back(0xc0 | (uni_ch >> 6));
-      } else {
-	if (uni_ch < 0x10000) {
-	  out.push_back(0xe0 | (uni_ch >> 12));
-	} else {
-	  out.push_back(0xf0 | (uni_ch >> 18));
-	  out.push_back(0x80 | ((uni_ch >> 12) & 0x3f));
-	}
-	out.push_back(0x80 | ((uni_ch >> 6) & 0x3f));
-      }
-      out.push_back(0x80 | (uni_ch & 0x3f));
-    }
-    return true;
-  }
-  
-  template<typename String, typename Iter> inline bool _parse_string(String& out, input<Iter>& in) {
-    while (1) {
-      int ch = in.getc();
-      if (ch < ' ') {
-	in.ungetc();
-	return false;
-      } else if (ch == '"') {
-	return true;
-      } else if (ch == '\\') {
-	if ((ch = in.getc()) == -1) {
-	  return false;
-	}
-	switch (ch) {
-#define MAP(sym, val) case sym: out.push_back(val); break
-	  MAP('"', '\"');
-	  MAP('\\', '\\');
-	  MAP('/', '/');
-	  MAP('b', '\b');
-	  MAP('f', '\f');
-	  MAP('n', '\n');
-	  MAP('r', '\r');
-	  MAP('t', '\t');
-#undef MAP
-	case 'u':
-	  if (! _parse_codepoint(out, in)) {
-	    return false;
-	  }
-	  break;
-	default:
-	  return false;
-	}
-      } else {
-	out.push_back(ch);
-      }
-    }
-    return false;
-  }
-  
-  template <typename Context, typename Iter> inline bool _parse_array(Context& ctx, input<Iter>& in) {
-    if (! ctx.parse_array_start()) {
-      return false;
-    }
-    if (in.expect(']')) {
-      return true;
-    }
-    size_t idx = 0;
-    do {
-      if (! ctx.parse_array_item(in, idx)) {
-	return false;
-      }
-      idx++;
-    } while (in.expect(','));
-    return in.expect(']');
-  }
-  
-  template <typename Context, typename Iter> inline bool _parse_object(Context& ctx, input<Iter>& in) {
-    if (! ctx.parse_object_start()) {
-      return false;
-    }
-    if (in.expect('}')) {
-      return true;
-    }
-    do {
-      std::string key;
-      if (! in.expect('"')
-	  || ! _parse_string(key, in)
-	  || ! in.expect(':')) {
-	return false;
-      }
-      if (! ctx.parse_object_item(in, key)) {
-	return false;
-      }
-    } while (in.expect(','));
-    return in.expect('}');
-  }
-  
-  template <typename Iter> inline bool _parse_number(double& out, input<Iter>& in) {
-    std::string num_str;
-    while (1) {
-      int ch = in.getc();
-      if (('0' <= ch && ch <= '9') || ch == '+' || ch == '-' || ch == '.'
-	  || ch == 'e' || ch == 'E') {
-	num_str.push_back(ch);
-      } else {
-	in.ungetc();
-	break;
-      }
-    }
-    char* endp;
-    out = strtod(num_str.c_str(), &endp);
-    return endp == num_str.c_str() + num_str.size();
-  }
-  
-  template <typename Context, typename Iter> inline bool _parse(Context& ctx, input<Iter>& in) {
-    in.skip_ws();
-    int ch = in.getc();
-    switch (ch) {
-#define IS(ch, text, op) case ch: \
-      if (in.match(text) && op) { \
-	return true; \
-      } else { \
-	return false; \
-      }
-      IS('n', "ull", ctx.set_null());
-      IS('f', "alse", ctx.set_bool(false));
-      IS('t', "rue", ctx.set_bool(true));
-#undef IS
-    case '"':
-      return ctx.parse_string(in);
-    case '[':
-      return _parse_array(ctx, in);
-    case '{':
-      return _parse_object(ctx, in);
-    default:
-      if (('0' <= ch && ch <= '9') || ch == '-') {
-	in.ungetc();
-	double f;
-	if (_parse_number(f, in)) {
-	  ctx.set_number(f);
-	  return true;
-	} else {
-	  return false;
-	}
-      }
-      break;
-    }
-    in.ungetc();
-    return false;
-  }
-  
-  class deny_parse_context {
-  public:
-    bool set_null() { return false; }
-    bool set_bool(bool) { return false; }
-    bool set_number(double) { return false; }
-    template <typename Iter> bool parse_string(input<Iter>&) { return false; }
-    bool parse_array_start() { return false; }
-    template <typename Iter> bool parse_array_item(input<Iter>&, size_t) {
-      return false;
-    }
-    bool parse_object_start() { return false; }
-    template <typename Iter> bool parse_object_item(input<Iter>&, const std::string&) {
-      return false;
-    }
-  };
-  
-  class default_parse_context {
-  protected:
-    value* out_;
-  public:
-    default_parse_context(value* out) : out_(out) {}
-    bool set_null() {
-      *out_ = value();
-      return true;
-    }
-    bool set_bool(bool b) {
-      *out_ = value(b);
-      return true;
-    }
-    bool set_number(double f) {
-      *out_ = value(f);
-      return true;
-    }
-    template<typename Iter> bool parse_string(input<Iter>& in) {
-      *out_ = value(string_type, false);
-      return _parse_string(out_->get<std::string>(), in);
-    }
-    bool parse_array_start() {
-      *out_ = value(array_type, false);
-      return true;
-    }
-    template <typename Iter> bool parse_array_item(input<Iter>& in, size_t) {
-      array& a = out_->get<array>();
-      a.push_back(value());
-      default_parse_context ctx(&a.back());
-      return _parse(ctx, in);
-    }
-    bool parse_object_start() {
-      *out_ = value(object_type, false);
-      return true;
-    }
-    template <typename Iter> bool parse_object_item(input<Iter>& in, const std::string& key) {
-      object& o = out_->get<object>();
-      default_parse_context ctx(&o[key]);
-      return _parse(ctx, in);
-    }
-  private:
-    default_parse_context(const default_parse_context&);
-    default_parse_context& operator=(const default_parse_context&);
-  };
-
-  class null_parse_context {
-  public:
-    struct dummy_str {
-      void push_back(int) {}
-    };
-  public:
-    null_parse_context() {}
-    bool set_null() { return true; }
-    bool set_bool(bool) { return true; }
-    bool set_number(double) { return true; }
-    template <typename Iter> bool parse_string(input<Iter>& in) {
-      dummy_str s;
-      return _parse_string(s, in);
-    }
-    bool parse_array_start() { return true; }
-    template <typename Iter> bool parse_array_item(input<Iter>& in, size_t) {
-      return _parse(*this, in);
-    }
-    bool parse_object_start() { return true; }
-    template <typename Iter> bool parse_object_item(input<Iter>& in, const std::string&) {
-      return _parse(*this, in);
-    }
-  private:
-    null_parse_context(const null_parse_context&);
-    null_parse_context& operator=(const null_parse_context&);
-  };
-  
-  // obsolete, use the version below
-  template <typename Iter> inline std::string parse(value& out, Iter& pos, const Iter& last) {
-    std::string err;
-    pos = parse(out, pos, last, &err);
-    return err;
-  }
-  
-  template <typename Context, typename Iter> inline Iter _parse(Context& ctx, const Iter& first, const Iter& last, std::string* err) {
-    input<Iter> in(first, last);
-    if (! _parse(ctx, in) && err != NULL) {
-      char buf[64];
-      SNPRINTF(buf, sizeof(buf), "syntax error at line %d near: ", in.line());
-      *err = buf;
-      while (1) {
-	int ch = in.getc();
-	if (ch == -1 || ch == '\n') {
-	  break;
-	} else if (ch >= ' ') {
-	  err->push_back(ch);
-	}
-      }
-    }
-    return in.cur();
-  }
-  
-  template <typename Iter> inline Iter parse(value& out, const Iter& first, const Iter& last, std::string* err) {
-    default_parse_context ctx(&out);
-    return _parse(ctx, first, last, err);
-  }
-  
-  inline std::string parse(value& out, std::istream& is) {
-    std::string err;
-    parse(out, std::istreambuf_iterator<char>(is.rdbuf()),
-	  std::istreambuf_iterator<char>(), &err);
-    return err;
-  }
-  
-  template <typename T> struct last_error_t {
-    static std::string s;
-  };
-  template <typename T> std::string last_error_t<T>::s;
-  
-  inline void set_last_error(const std::string& s) {
-    last_error_t<bool>::s = s;
-  }
-  
-  inline const std::string& get_last_error() {
-    return last_error_t<bool>::s;
-  }
-
-  inline bool operator==(const value& x, const value& y) {
-    if (x.is<null>())
-      return y.is<null>();
-#define PICOJSON_CMP(type)					\
-    if (x.is<type>())						\
-      return y.is<type>() && x.get<type>() == y.get<type>()
-    PICOJSON_CMP(bool);
-    PICOJSON_CMP(double);
-    PICOJSON_CMP(std::string);
-    PICOJSON_CMP(array);
-    PICOJSON_CMP(object);
-#undef PICOJSON_CMP
-    assert(0);
-#ifdef _MSC_VER
-    __assume(0);
-#endif
-    return false;
-  }
-  
-  inline bool operator!=(const value& x, const value& y) {
-    return ! (x == y);
-  }
-}
-
-inline std::istream& operator>>(std::istream& is, picojson::value& x)
-{
-  picojson::set_last_error(std::string());
-  std::string err = picojson::parse(x, is);
-  if (! err.empty()) {
-    picojson::set_last_error(err);
-    is.setstate(std::ios::failbit);
-  }
-  return is;
-}
-
-inline std::ostream& operator<<(std::ostream& os, const picojson::value& x)
-{
-  x.serialize(std::ostream_iterator<char>(os));
-  return os;
-}
-#ifdef _MSC_VER
-    #pragma warning(pop)
-#endif
-
-#endif
-#ifdef TEST_PICOJSON
-#ifdef _MSC_VER
-    #pragma warning(disable : 4127) // conditional expression is constant
-#endif
-
-using namespace std;
-  
-static void plan(int num)
-{
-  printf("1..%d\n", num);
-}
-
-static bool success = true;
-
-static void ok(bool b, const char* name = "")
-{
-  static int n = 1;
-  if (! b)
-    success = false;
-  printf("%s %d - %s\n", b ? "ok" : "ng", n++, name);
-}
-
-template <typename T> void is(const T& x, const T& y, const char* name = "")
-{
-  if (x == y) {
-    ok(true, name);
-  } else {
-    ok(false, name);
-  }
-}
-
-#include <algorithm>
-
-int main(void)
-{
-  plan(75);
-
-  // constructors
-#define TEST(expr, expected) \
-    is(picojson::value expr .serialize(), string(expected), "picojson::value" #expr)
-  
-  TEST( (true),  "true");
-  TEST( (false), "false");
-  TEST( (42.0),   "42");
-  TEST( (string("hello")), "\"hello\"");
-  TEST( ("hello"), "\"hello\"");
-  TEST( ("hello", 4), "\"hell\"");
-  
-#undef TEST
-  
-#define TEST(in, type, cmp, serialize_test) {				\
-    picojson::value v;							\
-    const char* s = in;							\
-    string err = picojson::parse(v, s, s + strlen(s));			\
-    ok(err.empty(), in " no error");					\
-    ok(v.is<type>(), in " check type");					\
-    is<type>(v.get<type>(), cmp, in " correct output");			\
-    is(*s, '\0', in " read to eof");					\
-    if (serialize_test) {						\
-      is(v.serialize(), string(in), in " serialize");			\
-    }									\
-  }
-  TEST("false", bool, false, true);
-  TEST("true", bool, true, true);
-  TEST("90.5", double, 90.5, false);
-  TEST("\"hello\"", string, string("hello"), true);
-  TEST("\"\\\"\\\\\\/\\b\\f\\n\\r\\t\"", string, string("\"\\/\b\f\n\r\t"),
-       true);
-  TEST("\"\\u0061\\u30af\\u30ea\\u30b9\"", string,
-       string("a\xe3\x82\xaf\xe3\x83\xaa\xe3\x82\xb9"), false);
-  TEST("\"\\ud840\\udc0b\"", string, string("\xf0\xa0\x80\x8b"), false);
-#undef TEST
-
-#define TEST(type, expr) {					       \
-    picojson::value v;						       \
-    const char *s = expr;					       \
-    string err = picojson::parse(v, s, s + strlen(s));		       \
-    ok(err.empty(), "empty " #type " no error");		       \
-    ok(v.is<picojson::type>(), "empty " #type " check type");	       \
-    ok(v.get<picojson::type>().empty(), "check " #type " array size"); \
-  }
-  TEST(array, "[]");
-  TEST(object, "{}");
-#undef TEST
-  
-  {
-    picojson::value v;
-    const char *s = "[1,true,\"hello\"]";
-    string err = picojson::parse(v, s, s + strlen(s));
-    ok(err.empty(), "array no error");
-    ok(v.is<picojson::array>(), "array check type");
-    is(v.get<picojson::array>().size(), size_t(3), "check array size");
-    ok(v.contains(0), "check contains array[0]");
-    ok(v.get(0).is<double>(), "check array[0] type");
-    is(v.get(0).get<double>(), 1.0, "check array[0] value");
-    ok(v.contains(1), "check contains array[1]");
-    ok(v.get(1).is<bool>(), "check array[1] type");
-    ok(v.get(1).get<bool>(), "check array[1] value");
-    ok(v.contains(2), "check contains array[2]");
-    ok(v.get(2).is<string>(), "check array[2] type");
-    is(v.get(2).get<string>(), string("hello"), "check array[2] value");
-    ok(!v.contains(3), "check not contains array[3]");
-  }
-  
-  {
-    picojson::value v;
-    const char *s = "{ \"a\": true }";
-    string err = picojson::parse(v, s, s + strlen(s));
-    ok(err.empty(), "object no error");
-    ok(v.is<picojson::object>(), "object check type");
-    is(v.get<picojson::object>().size(), size_t(1), "check object size");
-    ok(v.contains("a"), "check contains property");
-    ok(v.get("a").is<bool>(), "check bool property exists");
-    is(v.get("a").get<bool>(), true, "check bool property value");
-    is(v.serialize(), string("{\"a\":true}"), "serialize object");
-    ok(!v.contains("z"), "check not contains property");
-  }
-
-#define TEST(json, msg) do {				\
-    picojson::value v;					\
-    const char *s = json;				\
-    string err = picojson::parse(v, s, s + strlen(s));	\
-    is(err, string("syntax error at line " msg), msg);	\
-  } while (0)
-  TEST("falsoa", "1 near: oa");
-  TEST("{]", "1 near: ]");
-  TEST("\n\bbell", "2 near: bell");
-  TEST("\"abc\nd\"", "1 near: ");
-#undef TEST
-  
-  {
-    picojson::value v1, v2;
-    const char *s;
-    string err;
-    s = "{ \"b\": true, \"a\": [1,2,\"three\"], \"d\": 2 }";
-    err = picojson::parse(v1, s, s + strlen(s));
-    s = "{ \"d\": 2.0, \"b\": true, \"a\": [1,2,\"three\"] }";
-    err = picojson::parse(v2, s, s + strlen(s));
-    ok((v1 == v2), "check == operator in deep comparison");
-  }
-
-  {
-    picojson::value v1, v2;
-    const char *s;
-    string err;
-    s = "{ \"b\": true, \"a\": [1,2,\"three\"], \"d\": 2 }";
-    err = picojson::parse(v1, s, s + strlen(s));
-    s = "{ \"d\": 2.0, \"a\": [1,\"three\"], \"b\": true }";
-    err = picojson::parse(v2, s, s + strlen(s));
-    ok((v1 != v2), "check != operator for array in deep comparison");
-  }
-
-  {
-    picojson::value v1, v2;
-    const char *s;
-    string err;
-    s = "{ \"b\": true, \"a\": [1,2,\"three\"], \"d\": 2 }";
-    err = picojson::parse(v1, s, s + strlen(s));
-    s = "{ \"d\": 2.0, \"a\": [1,2,\"three\"], \"b\": false }";
-    err = picojson::parse(v2, s, s + strlen(s));
-    ok((v1 != v2), "check != operator for object in deep comparison");
-  }
-
-  {
-    picojson::value v1, v2;
-    const char *s;
-    string err;
-    s = "{ \"b\": true, \"a\": [1,2,\"three\"], \"d\": 2 }";
-    err = picojson::parse(v1, s, s + strlen(s));
-    picojson::object& o = v1.get<picojson::object>();
-    o.erase("b");
-    picojson::array& a = o["a"].get<picojson::array>();
-    picojson::array::iterator i;
-    i = std::remove(a.begin(), a.end(), picojson::value(std::string("three")));
-    a.erase(i, a.end());
-    s = "{ \"a\": [1,2], \"d\": 2 }";
-    err = picojson::parse(v2, s, s + strlen(s));
-    ok((v1 == v2), "check erase()");
-  }
-
-  ok(picojson::value(3.0).serialize() == "3",
-     "integral number should be serialized as a integer");
-  
-  {
-    const char* s = "{ \"a\": [1,2], \"d\": 2 }";
-    picojson::null_parse_context ctx;
-    string err;
-    picojson::_parse(ctx, s, s + strlen(s), &err);
-    ok(err.empty(), "null_parse_context");
-  }
-  
-  return success ? 0 : 1;
-}
-
-#endif
diff --git a/rst_parser/random_tree.cc b/rst_parser/random_tree.cc
deleted file mode 100644
index 23e6e7f7..00000000
--- a/rst_parser/random_tree.cc
+++ /dev/null
@@ -1,36 +0,0 @@
-#include "arc_factored.h"
-
-#include <vector>
-#include <iostream>
-#include <boost/program_options.hpp>
-#include <boost/program_options/variables_map.hpp>
-
-#include "timing_stats.h"
-#include "arc_ff.h"
-#include "dep_training.h"
-#include "stringlib.h"
-#include "filelib.h"
-#include "tdict.h"
-#include "weights.h"
-#include "rst.h"
-#include "global_ff.h"
-
-using namespace std;
-namespace po = boost::program_options;
-
-int main(int argc, char** argv) {
-  if (argc != 2) {
-    cerr << argv[0] << " N\n" << endl;
-    return 1;
-  }
-  MT19937 rng;
-  unsigned n = atoi(argv[1]);
-
-  ArcFactoredForest forest(n);
-  TreeSampler ts(forest);
-  EdgeSubset tree;
-  ts.SampleRandomSpanningTree(&tree, &rng);
-  cout << tree << endl;
-  return 0;
-}
-
diff --git a/rst_parser/rst.cc b/rst_parser/rst.cc
deleted file mode 100644
index bc91330b..00000000
--- a/rst_parser/rst.cc
+++ /dev/null
@@ -1,82 +0,0 @@
-#include "rst.h"
-
-using namespace std;
-
-// David B. Wilson. Generating Random Spanning Trees More Quickly than the Cover Time.
-// this is an awesome algorithm
-TreeSampler::TreeSampler(const ArcFactoredForest& af) : forest(af), usucc(af.size() + 1) {
-  // edges are directed from modifiers to heads, and finally to the root
-  vector<double> p;
-  for (int m = 1; m <= forest.size(); ++m) {
-#if USE_ALIAS_SAMPLER
-    p.clear();
-#else
-    SampleSet<double>& ss = usucc[m];
-#endif
-    double z = 0;
-    for (int h = 0; h <= forest.size(); ++h) {
-      double u = forest(h-1,m-1).edge_prob.as_float();
-      z += u;
-#if USE_ALIAS_SAMPLER
-      p.push_back(u);
-#else
-      ss.add(u);
-#endif
-    }
-#if USE_ALIAS_SAMPLER
-    for (int i = 0; i < p.size(); ++i) { p[i] /= z; }
-    usucc[m].Init(p);
-#endif
-  }
-}
-
-void TreeSampler::SampleRandomSpanningTree(EdgeSubset* tree, MT19937* prng) {
-  MT19937& rng = *prng;
-  const int r = 0;
-  bool success = false;
-  while (!success) {
-    int roots = 0;
-    tree->h_m_pairs.clear();
-    tree->roots.clear();
-    vector<int> next(forest.size() + 1, -1);
-    vector<char> in_tree(forest.size() + 1, 0);
-    in_tree[r] = 1;
-    //cerr << "Forest size: " << forest.size() << endl;
-    for (int i = 0; i <= forest.size(); ++i) {
-      //cerr << "Sampling starting at u=" << i << endl;
-      int u = i;
-      if (in_tree[u]) continue;
-      while(!in_tree[u]) {
-#if USE_ALIAS_SAMPLER
-        next[u] = usucc[u].Draw(rng);
-#else
-        next[u] = rng.SelectSample(usucc[u]);
-#endif
-        u = next[u];
-      }
-      u = i;
-      //cerr << (u-1);
-      int prev = u-1;
-      while(!in_tree[u]) {
-        in_tree[u] = true;
-        u = next[u];
-        //cerr << " > " << (u-1);
-        if (u == r) {
-          ++roots;
-          tree->roots.push_back(prev);
-        } else {
-          tree->h_m_pairs.push_back(make_pair<short,short>(u-1,prev));
-        }
-        prev = u-1;
-      }
-      //cerr << endl;
-    }
-    assert(roots > 0);
-    if (roots > 1) {
-      //cerr << "FAILURE\n";
-    } else {
-      success = true;
-    }
-  }
-};
-
diff --git a/rst_parser/rst.h b/rst_parser/rst.h
deleted file mode 100644
index 8bf389f7..00000000
--- a/rst_parser/rst.h
+++ /dev/null
@@ -1,21 +0,0 @@
-#ifndef _RST_H_
-#define _RST_H_
-
-#include <vector>
-#include "sampler.h"
-#include "arc_factored.h"
-#include "alias_sampler.h"
-
-struct TreeSampler {
-  explicit TreeSampler(const ArcFactoredForest& af);
-  void SampleRandomSpanningTree(EdgeSubset* tree, MT19937* rng);
-  const ArcFactoredForest& forest;
-#define USE_ALIAS_SAMPLER 1
-#if USE_ALIAS_SAMPLER
-  std::vector<AliasSampler> usucc;
-#else
-  std::vector<SampleSet<double> > usucc;
-#endif
-};
-
-#endif
diff --git a/rst_parser/rst_parse.cc b/rst_parser/rst_parse.cc
deleted file mode 100644
index 9c42a8f4..00000000
--- a/rst_parser/rst_parse.cc
+++ /dev/null
@@ -1,111 +0,0 @@
-#include "arc_factored.h"
-
-#include <vector>
-#include <iostream>
-#include <boost/program_options.hpp>
-#include <boost/program_options/variables_map.hpp>
-
-#include "timing_stats.h"
-#include "arc_ff.h"
-#include "dep_training.h"
-#include "stringlib.h"
-#include "filelib.h"
-#include "tdict.h"
-#include "weights.h"
-#include "rst.h"
-#include "global_ff.h"
-
-using namespace std;
-namespace po = boost::program_options;
-
-void InitCommandLine(int argc, char** argv, po::variables_map* conf) {
-  po::options_description opts("Configuration options");
-  string cfg_file;
-  opts.add_options()
-        ("input,i",po::value<string>()->default_value("-"), "File containing test data (jsent format)")
-        ("q_weights,q",po::value<string>(), "Arc-factored weights for proposal distribution (mandatory)")
-        ("p_weights,p",po::value<string>(), "Weights for target distribution (optional)")
-        ("samples,n",po::value<unsigned>()->default_value(1000), "Number of samples");
-  po::options_description clo("Command line options");
-  clo.add_options()
-        ("config,c", po::value<string>(&cfg_file), "Configuration file")
-        ("help,?", "Print this help message and exit");
-
-  po::options_description dconfig_options, dcmdline_options;
-  dconfig_options.add(opts);
-  dcmdline_options.add(dconfig_options).add(clo);
-  po::store(parse_command_line(argc, argv, dcmdline_options), *conf);
-  if (cfg_file.size() > 0) {
-    ReadFile rf(cfg_file);
-    po::store(po::parse_config_file(*rf.stream(), dconfig_options), *conf);
-  }
-  if (conf->count("help") || conf->count("q_weights") == 0) {
-    cerr << dcmdline_options << endl;
-    exit(1);
-  }
-}
-
-int main(int argc, char** argv) {
-  po::variables_map conf;
-  InitCommandLine(argc, argv, &conf);
-  vector<weight_t> qweights, pweights;
-  Weights::InitFromFile(conf["q_weights"].as<string>(), &qweights);
-  if (conf.count("p_weights"))
-    Weights::InitFromFile(conf["p_weights"].as<string>(), &pweights);
-  const bool global = pweights.size() > 0;
-  ArcFeatureFunctions ffs;
-  GlobalFeatureFunctions gff;
-  ReadFile rf(conf["input"].as<string>());
-  istream* in = rf.stream();
-  TrainingInstance sent;
-  MT19937 rng;
-  int samples = conf["samples"].as<unsigned>();
-  int totroot = 0, root_right = 0, tot = 0, cor = 0;
-  while(TrainingInstance::ReadInstance(in, &sent)) {
-    ffs.PrepareForInput(sent.ts);
-    if (global) gff.PrepareForInput(sent.ts);
-    ArcFactoredForest forest(sent.ts.pos.size());
-    forest.ExtractFeatures(sent.ts, ffs);
-    forest.Reweight(qweights);
-    TreeSampler ts(forest);
-    double best_score = -numeric_limits<double>::infinity();
-    EdgeSubset best_tree;
-    for (int n = 0; n < samples; ++n) {
-      EdgeSubset tree;
-      ts.SampleRandomSpanningTree(&tree, &rng);
-      SparseVector<double> qfeats, gfeats;
-      tree.ExtractFeatures(sent.ts, ffs, &qfeats);
-      double score = 0;
-      if (global) {
-        gff.Features(sent.ts, tree, &gfeats);
-        score = (qfeats + gfeats).dot(pweights);
-      } else {
-        score = qfeats.dot(qweights);
-      }
-      if (score > best_score) {
-        best_tree = tree;
-        best_score = score;
-      }
-    }
-    cerr << "BEST SCORE: " << best_score << endl;
-    cout << best_tree << endl;
-    const bool sent_has_ref = sent.tree.h_m_pairs.size() > 0;
-    if (sent_has_ref) {
-      map<pair<short,short>, bool> ref;
-      for (int i = 0; i < sent.tree.h_m_pairs.size(); ++i)
-        ref[sent.tree.h_m_pairs[i]] = true;
-      int ref_root = sent.tree.roots.front();
-      if (ref_root == best_tree.roots.front()) { ++root_right; }
-      ++totroot;
-      for (int i = 0; i < best_tree.h_m_pairs.size(); ++i) {
-        if (ref[best_tree.h_m_pairs[i]]) {
-          ++cor;
-        }
-        ++tot;
-      }
-    }
-  }
-  cerr << "F = " << (double(cor + root_right) / (tot + totroot)) << endl;
-  return 0;
-}
-
diff --git a/rst_parser/rst_train.cc b/rst_parser/rst_train.cc
deleted file mode 100644
index a8b8dd84..00000000
--- a/rst_parser/rst_train.cc
+++ /dev/null
@@ -1,144 +0,0 @@
-#include "arc_factored.h"
-
-#include <vector>
-#include <iostream>
-#include <boost/program_options.hpp>
-#include <boost/program_options/variables_map.hpp>
-
-#include "timing_stats.h"
-#include "arc_ff.h"
-#include "dep_training.h"
-#include "stringlib.h"
-#include "filelib.h"
-#include "tdict.h"
-#include "weights.h"
-#include "rst.h"
-#include "global_ff.h"
-
-using namespace std;
-namespace po = boost::program_options;
-
-void InitCommandLine(int argc, char** argv, po::variables_map* conf) {
-  po::options_description opts("Configuration options");
-  string cfg_file;
-  opts.add_options()
-        ("training_data,t",po::value<string>()->default_value("-"), "File containing training data (jsent format)")
-        ("q_weights,q",po::value<string>(), "Arc-factored weights for proposal distribution")
-        ("samples,n",po::value<unsigned>()->default_value(1000), "Number of samples");
-  po::options_description clo("Command line options");
-  clo.add_options()
-        ("config,c", po::value<string>(&cfg_file), "Configuration file")
-        ("help,?", "Print this help message and exit");
-
-  po::options_description dconfig_options, dcmdline_options;
-  dconfig_options.add(opts);
-  dcmdline_options.add(dconfig_options).add(clo);
-  po::store(parse_command_line(argc, argv, dcmdline_options), *conf);
-  if (cfg_file.size() > 0) {
-    ReadFile rf(cfg_file);
-    po::store(po::parse_config_file(*rf.stream(), dconfig_options), *conf);
-  }
-  if (conf->count("help")) {
-    cerr << dcmdline_options << endl;
-    exit(1);
-  }
-}
-
-int main(int argc, char** argv) {
-  po::variables_map conf;
-  InitCommandLine(argc, argv, &conf);
-  vector<weight_t> qweights(FD::NumFeats(), 0.0);
-  Weights::InitFromFile(conf["q_weights"].as<string>(), &qweights);
-  vector<TrainingInstance> corpus;
-  ArcFeatureFunctions ffs;
-  GlobalFeatureFunctions gff;
-  TrainingInstance::ReadTrainingCorpus(conf["training_data"].as<string>(), &corpus);
-  vector<ArcFactoredForest> forests(corpus.size());
-  vector<prob_t> zs(corpus.size());
-  SparseVector<double> empirical;
-  bool flag = false;
-  for (int i = 0; i < corpus.size(); ++i) {
-    TrainingInstance& cur = corpus[i];
-    if ((i+1) % 10 == 0) { cerr << '.' << flush; flag = true; }
-    if ((i+1) % 400 == 0) { cerr << " [" << (i+1) << "]\n"; flag = false; }
-    SparseVector<weight_t> efmap;
-    ffs.PrepareForInput(cur.ts);
-    gff.PrepareForInput(cur.ts);
-    for (int j = 0; j < cur.tree.h_m_pairs.size(); ++j) {
-      efmap.clear();
-      ffs.EdgeFeatures(cur.ts, cur.tree.h_m_pairs[j].first,
-                       cur.tree.h_m_pairs[j].second,
-                       &efmap);
-      cur.features += efmap;
-    }
-    for (int j = 0; j < cur.tree.roots.size(); ++j) {
-      efmap.clear();
-      ffs.EdgeFeatures(cur.ts, -1, cur.tree.roots[j], &efmap);
-      cur.features += efmap;
-    }
-    efmap.clear();
-    gff.Features(cur.ts, cur.tree, &efmap);
-    cur.features += efmap;
-    empirical += cur.features;
-    forests[i].resize(cur.ts.words.size());
-    forests[i].ExtractFeatures(cur.ts, ffs);
-    forests[i].Reweight(qweights);
-    forests[i].EdgeMarginals(&zs[i]);
-    zs[i] = prob_t::One() / zs[i];
-    // cerr << zs[i] << endl;
-    forests[i].Reweight(qweights);    // EdgeMarginals overwrites edge_prob
-  }
-  if (flag) cerr << endl;
-  MT19937 rng;
-  SparseVector<double> model_exp;
-  SparseVector<double> weights;
-  Weights::InitSparseVector(qweights, &weights);
-  int samples = conf["samples"].as<unsigned>();
-  for (int i = 0; i < corpus.size(); ++i) {
-#if 0
-    forests[i].EdgeMarginals();
-    model_exp.clear();
-    for (int h = -1; h < num_words; ++h) {
-      for (int m = 0; m < num_words; ++m) {
-        if (h == m) continue;
-        const ArcFactoredForest::Edge& edge = forests[i](h,m);
-        const SparseVector<weight_t>& fmap = edge.features;
-        double prob = edge.edge_prob.as_float();
-        model_exp += fmap * prob;
-      }
-    }
-    cerr << "TRUE EXP: " << model_exp << endl;
-    forests[i].Reweight(weights);
-#endif
-
-    TreeSampler ts(forests[i]);
-    prob_t zhat = prob_t::Zero();
-    SparseVector<prob_t> sampled_exp;
-    for (int n = 0; n < samples; ++n) {
-      EdgeSubset tree;
-      ts.SampleRandomSpanningTree(&tree, &rng);
-      SparseVector<double> qfeats, gfeats;
-      tree.ExtractFeatures(corpus[i].ts, ffs, &qfeats);
-      prob_t u; u.logeq(qfeats.dot(qweights));
-      const prob_t q = u / zs[i];  // proposal mass
-      gff.Features(corpus[i].ts, tree, &gfeats);
-      SparseVector<double> tot_feats = qfeats + gfeats;
-      u.logeq(tot_feats.dot(weights));
-      prob_t w = u / q;
-      zhat += w;
-      for (SparseVector<double>::iterator it = tot_feats.begin(); it != tot_feats.end(); ++it)
-        sampled_exp.add_value(it->first, w * prob_t(it->second));
-    }
-    sampled_exp /= zhat;
-    SparseVector<double> tot_m;
-    for (SparseVector<prob_t>::iterator it = sampled_exp.begin(); it != sampled_exp.end(); ++it)
-      tot_m.add_value(it->first, it->second.as_float());
-    //cerr << "DIFF: " << (tot_m - corpus[i].features) << endl;
-    const double eta = 0.03;
-    weights -= (tot_m - corpus[i].features) * eta;
-  }
-  cerr << "WEIGHTS.\n";
-  cerr << weights << endl;
-  return 0;
-}
-