From f819992b0b22b4fec88c15fe13118aa6b484b91b Mon Sep 17 00:00:00 2001
From: graehl <graehl@ec762483-ff6d-05da-a07a-a48fb63a330f>
Date: Thu, 15 Jul 2010 03:50:05 +0000
Subject: oracle bleu refactor

git-svn-id: https://ws10smt.googlecode.com/svn/trunk@259 ec762483-ff6d-05da-a07a-a48fb63a330f
---
 decoder/oracle_bleu.h | 154 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 154 insertions(+)
 create mode 100755 decoder/oracle_bleu.h

(limited to 'decoder/oracle_bleu.h')

diff --git a/decoder/oracle_bleu.h b/decoder/oracle_bleu.h
new file mode 100755
index 00000000..273e14b8
--- /dev/null
+++ b/decoder/oracle_bleu.h
@@ -0,0 +1,154 @@
+#ifndef ORACLE_BLEU_H
+#define ORACLE_BLEU_H
+
+#include <iostream>
+#include <string>
+#include <vector>
+#include <boost/program_options.hpp>
+#include <boost/program_options/variables_map.hpp>
+#include "../vest/scorer.h"
+#include "hg.h"
+#include "ff_factory.h"
+#include "ff_bleu.h"
+#include "sparse_vector.h"
+#include "viterbi.h"
+#include "sentence_metadata.h"
+#include "apply_models.h"
+
+//TODO: put function impls into .cc
+//TODO: disentangle
+struct Translation {
+  typedef std::vector<WordID> Sentence;
+  Sentence sentence;
+  FeatureVector features;
+  Translation() {  }
+  Translation(Hypergraph const& hg,WeightVector *feature_weights=0)
+  {
+    Viterbi(hg,feature_weights);
+  }
+  void Viterbi(Hypergraph const& hg,WeightVector *feature_weights=0) // weights are only for checking that scoring is correct
+  {
+    ViterbiESentence(hg,&sentence);
+    features=ViterbiFeatures(hg,feature_weights,true);
+  }
+  void Print(std::ostream &out,std::string pre="   +Oracle BLEU ") {
+    out<<pre<<"Viterbi: "<<TD::GetString(sentence)<<"\n";
+    out<<pre<<"features: "<<features<<std::endl;
+  }
+
+};
+
+
+struct OracleBleu {
+  typedef std::vector<std::string> Refs;
+  Refs refs;
+  WeightVector feature_weights_;
+  DocScorer ds;
+
+  static void AddOptions(boost::program_options::options_description *opts) {
+    using namespace boost::program_options;
+    using namespace std;
+    opts->add_options()
+      ("references,R", value<Refs >(), "Translation reference files")
+      ("oracle_loss", value<string>(), "IBM_BLEU_3 (default), IBM_BLEU etc")
+      ;
+  }
+  int order;
+
+  //TODO: move cdec.cc kbest output files function here
+
+  //TODO: provide for loading most recent translation for every sentence (no more scale.. etc below? it's possible i messed the below up; i assume it's supposed to gracefully figure out the document 1bests as you go, then keep them up to date as you make multiple MIRA passes.  provide alternative loading for MERT
+  double scale_oracle;
+  int oracle_doc_size;
+  double tmp_src_length;
+  double doc_src_length;
+  void set_oracle_doc_size(int size) {
+    oracle_doc_size=size;
+    scale_oracle=  1-1./oracle_doc_size;\
+    doc_src_length=0;
+  }
+  OracleBleu(int doc_size=10) {
+    set_oracle_doc_size(doc_size);
+  }
+
+  boost::shared_ptr<Score> doc_score,sentscore; // made from factory, so we delete them
+
+  void UseConf(boost::program_options::variables_map const& conf) {
+    using namespace std;
+    set_loss(conf["oracle_loss"].as<string>());
+    set_refs(conf["references"].as<Refs>());
+  }
+
+  ScoreType loss;
+//  std::string loss_name;
+  boost::shared_ptr<FeatureFunction> pff;
+
+  void set_loss(std::string const& lossd="IBM_BLEU_3") {
+//    loss_name=lossd;
+    loss=ScoreTypeFromString(lossd);
+    order=(loss==IBM_BLEU_3)?3:4;
+    std::ostringstream param;
+    param<<"-o "<<order;
+    pff=global_ff_registry->Create("BLEUModel",param.str());
+  }
+
+  void set_refs(Refs const& r) {
+    refs=r;
+    assert(refs.size());
+    ds=DocScorer(loss,refs);
+    doc_score.reset();
+//    doc_score=sentscore
+    std::cerr << "Loaded " << ds.size() << " references for scoring with " << StringFromScoreType(loss) << std::endl;
+  }
+
+  SentenceMetadata MakeMetadata(Hypergraph const& forest,int sent_id) {
+    std::vector<WordID> srcsent;
+    ViterbiFSentence(forest,&srcsent);
+    SentenceMetadata sm(sent_id,Lattice()); //TODO: make reference from refs?
+    sm.SetSourceLength(srcsent.size());
+    return sm;
+  }
+
+  void Rescore(SentenceMetadata & smeta,Hypergraph const& forest,Hypergraph *dest_forest,WeightVector const& feature_weights,double bleu_weight=1.0) {
+    Translation model_trans(forest);
+    sentscore.reset(ds[smeta.GetSentenceID()]->ScoreCandidate(model_trans.sentence));
+	if (!doc_score) { doc_score.reset(sentscore->GetOne()); }
+	tmp_src_length = smeta.GetSourceLength(); //TODO: where does this come from?
+	smeta.SetScore(doc_score.get());
+	smeta.SetDocLen(doc_src_length);
+	smeta.SetDocScorer(&ds);
+    using namespace std;
+    ModelSet oracle_models(FeatureWeights(bleu_weight,1),vector<FeatureFunction const*>(1,pff.get()));
+    const IntersectionConfiguration inter_conf_oracle(0, 0);
+	cerr << "Going to call Apply Model " << endl;
+	ApplyModelSet(forest,
+                  smeta,
+                  oracle_models,
+                  inter_conf_oracle,
+                  dest_forest);
+    feature_weights_=feature_weights;
+    ReweightBleu(dest_forest,bleu_weight);
+  }
+
+  void IncludeLastScore(std::ostream *out=0) {
+    double bleu_scale_ = doc_src_length * doc_score->ComputeScore();
+    doc_score->PlusEquals(*sentscore, scale_oracle);
+	sentscore.reset();
+    doc_src_length = (doc_src_length + tmp_src_length) * scale_oracle;
+    if (out) {
+      std::string d;
+      doc_score->ScoreDetails(&d);
+      *out << "SCALED SCORE: " << bleu_scale_ << "DOC BLEU " << doc_score->ComputeScore() << " " <<d << std::endl;
+    }
+  }
+
+  void ReweightBleu(Hypergraph *dest_forest,double bleu_weight=-1.) {
+    feature_weights_[0]=bleu_weight;
+	dest_forest->Reweight(feature_weights_);
+//	dest_forest->SortInEdgesByEdgeWeights();
+  }
+
+};
+
+
+#endif
-- 
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