mirror of
https://github.com/moses-smt/mosesdecoder.git
synced 2024-12-28 14:32:38 +03:00
99 lines
3.0 KiB
C++
99 lines
3.0 KiB
C++
#include "PhraseBoundaryFeature.h"
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#include "Hypothesis.h"
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using namespace std;
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namespace Moses {
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int PhraseBoundaryState::Compare(const FFState& other) const
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{
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const PhraseBoundaryState& rhs = dynamic_cast<const PhraseBoundaryState&>(other);
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int tgt = Word::Compare(*m_targetWord,*(rhs.m_targetWord));
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if (tgt) return tgt;
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return Word::Compare(*m_sourceWord,*(rhs.m_sourceWord));
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}
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PhraseBoundaryFeature::PhraseBoundaryFeature(const std::string &line)
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: StatefulFeatureFunction("PhraseBoundaryFeature", ScoreProducer::unlimited, line)
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{
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std::cerr << "Initializing source word deletion feature.." << std::endl;
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for (size_t i = 0; i < m_args.size(); ++i) {
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const vector<string> &args = m_args[i];
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if (args[0] == "source") {
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m_sourceFactors = Tokenize<FactorType>(args[1], ",");
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}
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else if (args[0] == "target") {
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m_targetFactors = Tokenize<FactorType>(args[1], ",");
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}
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else {
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throw "Unknown argument " + args[0];
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}
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}
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}
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const FFState* PhraseBoundaryFeature::EmptyHypothesisState(const InputType &) const
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{
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return new PhraseBoundaryState(NULL,NULL);
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}
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void PhraseBoundaryFeature::AddFeatures(
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const Word* leftWord, const Word* rightWord, const FactorList& factors, const string& side,
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ScoreComponentCollection* scores) const {
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for (size_t i = 0; i < factors.size(); ++i) {
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ostringstream name;
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name << side << ":";
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name << factors[i];
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name << ":";
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if (leftWord) {
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name << leftWord->GetFactor(factors[i])->GetString();
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} else {
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name << BOS_;
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}
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name << ":";
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if (rightWord) {
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name << rightWord->GetFactor(factors[i])->GetString();
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} else {
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name << EOS_;
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}
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scores->PlusEquals(this,name.str(),1);
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}
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}
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FFState* PhraseBoundaryFeature::Evaluate
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(const Hypothesis& cur_hypo, const FFState* prev_state,
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ScoreComponentCollection* scores) const
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{
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const PhraseBoundaryState* pbState = dynamic_cast<const PhraseBoundaryState*>(prev_state);
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const Phrase& targetPhrase = cur_hypo.GetCurrTargetPhrase();
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if (targetPhrase.GetSize() == 0) {
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return new PhraseBoundaryState(*pbState);
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}
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const Word* leftTargetWord = pbState->GetTargetWord();
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const Word* rightTargetWord = &(targetPhrase.GetWord(0));
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AddFeatures(leftTargetWord,rightTargetWord,m_targetFactors,"tgt",scores);
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const Phrase* sourcePhrase = cur_hypo.GetSourcePhrase();
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const Word* leftSourceWord = pbState->GetSourceWord();
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const Word* rightSourceWord = &(sourcePhrase->GetWord(0));
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AddFeatures(leftSourceWord,rightSourceWord,m_sourceFactors,"src",scores);
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const Word* endSourceWord = &(sourcePhrase->GetWord(sourcePhrase->GetSize()-1));
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const Word* endTargetWord = &(targetPhrase.GetWord(targetPhrase.GetSize()-1));
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//if end of sentence add EOS
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if (cur_hypo.IsSourceCompleted()) {
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AddFeatures(endSourceWord,NULL,m_sourceFactors,"src",scores);
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AddFeatures(endTargetWord,NULL,m_targetFactors,"tgt",scores);
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}
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return new PhraseBoundaryState(endSourceWord,endTargetWord);
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}
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}
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