mirror of
https://github.com/moses-smt/mosesdecoder.git
synced 2024-12-27 05:55:02 +03:00
119 lines
3.4 KiB
C++
119 lines
3.4 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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#include "UserMessage.h"
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#include "Util.h"
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namespace Moses {
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using namespace std;
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SourceWordDeletionFeature::SourceWordDeletionFeature(const std::string &line)
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:StatelessFeatureFunction("swd", FeatureFunction::unlimited, line),
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m_unrestricted(true)
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{
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std::cerr << "Initializing source word deletion feature.." << std::endl;
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string filename;
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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] == "factor") {
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m_factorType = Scan<FactorType>(args[1]);
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}
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else if (args[0] == "path") {
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filename = 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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// load word list for restricted feature set
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cerr << "loading source word deletion word list from " << filename << endl;
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if (!Load(filename)) {
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UserMessage::Add("Unable to load word list for source word deletion feature from file " + filename);
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//return false;
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}
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}
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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 && !alignmentInfo.GetSize()) return;
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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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