merge upstream/master

1 files changed, 280 insertions, 0 deletions

diff --git a/gi/pf/pfnaive.cc b/gi/pf/pfnaive.cc
new file mode 100644
index 00000000..33dc08c3
--- /dev/null
+++ b/gi/pf/pfnaive.cc
@@ -0,0 +1,280 @@
+#include <iostream>
+#include <tr1/memory>
+#include <queue>
+
+#include <boost/functional.hpp>
+#include <boost/program_options.hpp>
+#include <boost/program_options/variables_map.hpp>
+
+#include "base_measures.h"
+#include "monotonic_pseg.h"
+#include "reachability.h"
+#include "viterbi.h"
+#include "hg.h"
+#include "trule.h"
+#include "tdict.h"
+#include "filelib.h"
+#include "dict.h"
+#include "sampler.h"
+#include "ccrp_nt.h"
+#include "ccrp_onetable.h"
+#include "corpus.h"
+
+using namespace std;
+using namespace tr1;
+namespace po = boost::program_options;
+
+shared_ptr<MT19937> prng;
+
+void InitCommandLine(int argc, char** argv, po::variables_map* conf) {
+  po::options_description opts("Configuration options");
+  opts.add_options()
+        ("samples,s",po::value<unsigned>()->default_value(1000),"Number of samples")
+        ("particles,p",po::value<unsigned>()->default_value(30),"Number of particles")
+        ("filter_frequency,f",po::value<unsigned>()->default_value(5),"Number of time steps between filterings")
+        ("input,i",po::value<string>(),"Read parallel data from")
+        ("max_src_phrase",po::value<unsigned>()->default_value(5),"Maximum length of source language phrases")
+        ("max_trg_phrase",po::value<unsigned>()->default_value(5),"Maximum length of target language phrases")
+        ("model1,m",po::value<string>(),"Model 1 parameters (used in base distribution)")
+        ("inverse_model1,M",po::value<string>(),"Inverse Model 1 parameters (used in backward estimate)")
+        ("model1_interpolation_weight",po::value<double>()->default_value(0.95),"Mixing proportion of model 1 with uniform target distribution")
+        ("random_seed,S",po::value<uint32_t>(), "Random seed");
+  po::options_description clo("Command line options");
+  clo.add_options()
+        ("config", po::value<string>(), "Configuration file")
+        ("help,h", "Print this help message and exit");
+  po::options_description dconfig_options, dcmdline_options;
+  dconfig_options.add(opts);
+  dcmdline_options.add(opts).add(clo);
+  
+  po::store(parse_command_line(argc, argv, dcmdline_options), *conf);
+  if (conf->count("config")) {
+    ifstream config((*conf)["config"].as<string>().c_str());
+    po::store(po::parse_config_file(config, dconfig_options), *conf);
+  }
+  po::notify(*conf);
+
+  if (conf->count("help") || (conf->count("input") == 0)) {
+    cerr << dcmdline_options << endl;
+    exit(1);
+  }
+}
+
+struct BackwardEstimateSym {
+  BackwardEstimateSym(const Model1& m1,
+                      const Model1& invm1, const vector<WordID>& src, const vector<WordID>& trg) :
+      model1_(m1), invmodel1_(invm1), src_(src), trg_(trg) {
+  }
+  const prob_t& operator()(unsigned src_cov, unsigned trg_cov) const {
+    assert(src_cov <= src_.size());
+    assert(trg_cov <= trg_.size());
+    prob_t& e = cache_[src_cov][trg_cov];
+    if (e.is_0()) {
+      if (trg_cov == trg_.size()) { e = prob_t::One(); return e; }
+      vector<WordID> r(src_.size() + 1); r.clear();
+      for (int i = src_cov; i < src_.size(); ++i)
+        r.push_back(src_[i]);
+      r.push_back(0);  // NULL word
+      const prob_t uniform_alignment(1.0 / r.size());
+      e.logeq(log_poisson(trg_.size() - trg_cov, r.size() - 1)); // p(trg len remaining | src len remaining)
+      for (unsigned j = trg_cov; j < trg_.size(); ++j) {
+        prob_t p;
+        for (unsigned i = 0; i < r.size(); ++i)
+          p += model1_(r[i], trg_[j]);
+        if (p.is_0()) {
+          cerr << "ERROR: p(" << TD::Convert(trg_[j]) << " | " << TD::GetString(r) << ") = 0!\n";
+          abort();
+        }
+        p *= uniform_alignment;
+        e *= p;
+      }
+      r.pop_back();
+      const prob_t inv_uniform(1.0 / (trg_.size() - trg_cov + 1.0));
+      prob_t inv;
+      inv.logeq(log_poisson(r.size(), trg_.size() - trg_cov));
+      for (unsigned i = 0; i < r.size(); ++i) {
+        prob_t p;
+        for (unsigned j = trg_cov - 1; j < trg_.size(); ++j)
+          p += invmodel1_(j < trg_cov ? 0 : trg_[j], r[i]);
+        if (p.is_0()) {
+          cerr << "ERROR: p_inv(" << TD::Convert(r[i]) << " | " << TD::GetString(trg_) << ") = 0!\n";
+          abort();
+        }
+        p *= inv_uniform;
+        inv *= p;
+      }
+      prob_t x = pow(e * inv, 0.5);
+      e = x;
+      //cerr << "Forward: " << log(e) << "\tBackward: " << log(inv) << "\t prop: " << log(x) << endl;
+    }
+    return e;
+  }
+  const Model1& model1_;
+  const Model1& invmodel1_;
+  const vector<WordID>& src_;
+  const vector<WordID>& trg_;
+  mutable unordered_map<unsigned, map<unsigned, prob_t> > cache_;
+};
+
+struct Particle {
+  Particle() : weight(prob_t::One()), src_cov(), trg_cov() {}
+  prob_t weight;
+  prob_t gamma_last;
+  vector<TRulePtr> rules;
+  int src_cov;
+  int trg_cov;
+};
+
+ostream& operator<<(ostream& o, const vector<bool>& v) {
+  for (int i = 0; i < v.size(); ++i)
+    o << (v[i] ? '1' : '0');
+  return o;
+}
+ostream& operator<<(ostream& o, const Particle& p) {
+  o << "[src_cov=" << p.src_cov << " trg_cov=" << p.trg_cov << " num_rules=" << p.rules.size() << "  w=" << log(p.weight) << ']';
+  return o;
+}
+
+void FilterCrapParticlesAndReweight(vector<Particle>* pps) {
+  vector<Particle>& ps = *pps;
+  SampleSet<prob_t> ss;
+  for (int i = 0; i < ps.size(); ++i)
+    ss.add(ps[i].weight);
+  vector<Particle> nps; nps.reserve(ps.size());
+  const prob_t uniform_weight(1.0 / ps.size());
+  for (int i = 0; i < ps.size(); ++i) {
+    nps.push_back(ps[prng->SelectSample(ss)]);
+    nps[i].weight = uniform_weight;
+  }
+  nps.swap(ps);
+}
+
+int main(int argc, char** argv) {
+  po::variables_map conf;
+  InitCommandLine(argc, argv, &conf);
+  const unsigned kMAX_TRG_PHRASE = conf["max_trg_phrase"].as<unsigned>();
+  const unsigned kMAX_SRC_PHRASE = conf["max_src_phrase"].as<unsigned>();
+  const unsigned particles = conf["particles"].as<unsigned>();
+  const unsigned samples = conf["samples"].as<unsigned>();
+  const unsigned rejuv_freq = conf["filter_frequency"].as<unsigned>();
+
+  if (!conf.count("model1")) {
+    cerr << argv[0] << "Please use --model1 to specify model 1 parameters\n";
+    return 1;
+  }
+  if (conf.count("random_seed"))
+    prng.reset(new MT19937(conf["random_seed"].as<uint32_t>()));
+  else
+    prng.reset(new MT19937);
+  MT19937& rng = *prng;
+
+  vector<vector<WordID> > corpuse, corpusf;
+  set<WordID> vocabe, vocabf;
+  cerr << "Reading corpus...\n";
+  corpus::ReadParallelCorpus(conf["input"].as<string>(), &corpusf, &corpuse, &vocabf, &vocabe);
+  cerr << "F-corpus size: " << corpusf.size() << " sentences\t (" << vocabf.size() << " word types)\n";
+  cerr << "E-corpus size: " << corpuse.size() << " sentences\t (" << vocabe.size() << " word types)\n";
+  assert(corpusf.size() == corpuse.size());
+
+  const int kLHS = -TD::Convert("X");
+  Model1 m1(conf["model1"].as<string>());
+  Model1 invm1(conf["inverse_model1"].as<string>());
+
+  PhraseJointBase lp0(m1, conf["model1_interpolation_weight"].as<double>(), vocabe.size(), vocabf.size());
+  MonotonicParallelSegementationModel m(lp0);
+
+  cerr << "Initializing reachability limits...\n";
+  vector<Particle> ps(corpusf.size());
+  vector<Reachability> reaches; reaches.reserve(corpusf.size());
+  for (int ci = 0; ci < corpusf.size(); ++ci)
+    reaches.push_back(Reachability(corpusf[ci].size(),
+                                   corpuse[ci].size(),
+                                   kMAX_SRC_PHRASE,
+                                   kMAX_TRG_PHRASE));
+  cerr << "Sampling...\n"; 
+  vector<Particle> tmp_p(10000);  // work space
+  SampleSet<prob_t> pfss;
+  for (int SS=0; SS < samples; ++SS) {
+    for (int ci = 0; ci < corpusf.size(); ++ci) {
+      vector<int>& src = corpusf[ci];
+      vector<int>& trg = corpuse[ci];
+      m.DecrementRulesAndStops(ps[ci].rules);
+      const prob_t q_stop = m.StopProbability();
+      const prob_t q_cont = m.ContinueProbability();
+      cerr << "P(stop)=" << q_stop << "\tP(continue)=" <<q_cont << endl;
+
+      BackwardEstimateSym be(m1, invm1, src, trg);
+      const Reachability& r = reaches[ci];
+      vector<Particle> lps(particles);
+
+      bool all_complete = false;
+      while(!all_complete) {
+        SampleSet<prob_t> ss;
+
+        // all particles have now been extended a bit, we will reweight them now
+        if (lps[0].trg_cov > 0)
+          FilterCrapParticlesAndReweight(&lps);
+
+        // loop over all particles and extend them
+        bool done_nothing = true;
+        for (int pi = 0; pi < particles; ++pi) {
+          Particle& p = lps[pi];
+          int tic = 0;
+          while(p.trg_cov < trg.size() && tic < rejuv_freq) {
+            ++tic;
+            done_nothing = false;
+            ss.clear();
+            TRule x; x.lhs_ = kLHS;
+            prob_t z;
+
+            for (int trg_len = 1; trg_len <= kMAX_TRG_PHRASE; ++trg_len) {
+              x.e_.push_back(trg[trg_len - 1 + p.trg_cov]);
+              for (int src_len = 1; src_len <= kMAX_SRC_PHRASE; ++src_len) {
+                if (!r.edges[p.src_cov][p.trg_cov][src_len][trg_len]) continue;
+
+                int i = p.src_cov;
+                assert(ss.size() < tmp_p.size());  // if fails increase tmp_p size
+                Particle& np = tmp_p[ss.size()];
+                np = p;
+                x.f_.clear();
+                for (int j = 0; j < src_len; ++j)
+                  x.f_.push_back(src[i + j]);
+                np.src_cov += x.f_.size();
+                np.trg_cov += x.e_.size();
+                const bool stop_now = (np.src_cov == src_len && np.trg_cov == trg_len);
+                prob_t rp = m.RuleProbability(x) * (stop_now ? q_stop : q_cont);
+                np.gamma_last = rp;
+                const prob_t u = pow(np.gamma_last * pow(be(np.src_cov, np.trg_cov), 1.2), 0.1);
+                //cerr << "**rule=" << x << endl;
+                //cerr << "  u=" << log(u) << "  rule=" << rp << endl;
+                ss.add(u);
+                np.rules.push_back(TRulePtr(new TRule(x)));
+                z += u;
+              }
+            }
+            //cerr << "number of edges to consider: " << ss.size() << endl;
+            const int sampled = rng.SelectSample(ss);
+            prob_t q_n = ss[sampled] / z;
+            p = tmp_p[sampled];
+            //m.IncrementRule(*p.rules.back());
+            p.weight *= p.gamma_last / q_n;
+            //cerr << "[w=" << log(p.weight) << "]\tsampled rule: " << p.rules.back()->AsString() << endl;
+            //cerr << p << endl;
+          }
+        } // loop over particles (pi = 0 .. particles)
+        if (done_nothing) all_complete = true;
+      }
+      pfss.clear();
+      for (int i = 0; i < lps.size(); ++i)
+        pfss.add(lps[i].weight);
+      const int sampled = rng.SelectSample(pfss);
+      ps[ci] = lps[sampled];
+      m.IncrementRulesAndStops(lps[sampled].rules);
+      for (int i = 0; i < lps[sampled].rules.size(); ++i) { cerr << "S:\t" << lps[sampled].rules[i]->AsString() << "\n"; }
+      cerr << "tmp-LLH: " << log(m.Likelihood()) << endl;
+    }
+    cerr << "LLH: " << log(m.Likelihood()) << endl;
+  }
+  return 0;
+}
+