mirror of
https://github.com/moses-smt/mosesdecoder.git
synced 2024-12-27 05:55:02 +03:00
93 lines
2.7 KiB
C++
93 lines
2.7 KiB
C++
#include <sstream>
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#include "SourceWordDeletionFeature.h"
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#include "Phrase.h"
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#include "TargetPhrase.h"
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#include "Hypothesis.h"
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#include "ChartHypothesis.h"
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#include "ScoreComponentCollection.h"
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#include "TranslationOption.h"
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namespace Moses {
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using namespace std;
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bool SourceWordDeletionFeature::Load(const std::string &filePath)
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{
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ifstream inFile(filePath.c_str());
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if (!inFile)
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{
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cerr << "could not open file " << filePath << endl;
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return false;
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}
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std::string line;
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while (getline(inFile, line)) {
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m_vocab.insert(line);
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}
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inFile.close();
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m_unrestricted = false;
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return true;
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}
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void SourceWordDeletionFeature::Evaluate(
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const PhraseBasedFeatureContext& context,
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ScoreComponentCollection* accumulator) const
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{
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const TargetPhrase& targetPhrase = context.GetTargetPhrase();
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const AlignmentInfo &alignmentInfo = targetPhrase.GetAlignTerm();
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ComputeFeatures(targetPhrase, accumulator, alignmentInfo);
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}
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void SourceWordDeletionFeature::EvaluateChart(
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const ChartBasedFeatureContext& context,
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ScoreComponentCollection* accumulator) const
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{
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const AlignmentInfo &alignmentInfo = context.GetTargetPhrase().GetAlignTerm();
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ComputeFeatures(context.GetTargetPhrase(), accumulator, alignmentInfo);
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}
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void SourceWordDeletionFeature::ComputeFeatures(const TargetPhrase& targetPhrase,
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ScoreComponentCollection* accumulator,
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const AlignmentInfo &alignmentInfo) const
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{
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// handle special case: unknown words (they have no word alignment)
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size_t targetLength = targetPhrase.GetSize();
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size_t sourceLength = targetPhrase.GetSourcePhrase().GetSize();
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if (targetLength == 1 && sourceLength == 1) {
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const Factor* f1 = targetPhrase.GetWord(0).GetFactor(1);
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if (f1 && f1->GetString().compare(UNKNOWN_FACTOR) == 0) {
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return;
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}
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}
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// flag aligned words
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bool aligned[16];
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CHECK(sourceLength < 16);
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for(size_t i=0; i<sourceLength; i++)
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aligned[i] = false;
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for (AlignmentInfo::const_iterator alignmentPoint = alignmentInfo.begin(); alignmentPoint != alignmentInfo.end(); alignmentPoint++)
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aligned[ alignmentPoint->first ] = true;
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// process unaligned source words
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for(size_t i=0; i<sourceLength; i++) {
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if (!aligned[i]) {
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Word w = targetPhrase.GetSourcePhrase().GetWord(i);
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if (!w.IsNonTerminal()) {
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const string &word = w.GetFactor(m_factorType)->GetString();
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if (word != "<s>" && word != "</s>") {
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if (!m_unrestricted && m_vocab.find( word ) == m_vocab.end()) {
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accumulator->PlusEquals(this,"OTHER",1);
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}
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else {
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accumulator->PlusEquals(this,word,1);
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}
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}
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}
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}
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}
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}
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}
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