mirror of
https://github.com/moses-smt/mosesdecoder.git
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94 lines
2.4 KiB
C++
94 lines
2.4 KiB
C++
#ifndef moses_GlobalLexicalModel_h
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#define moses_GlobalLexicalModel_h
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#include <string>
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#include <vector>
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#include <memory>
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#include "Factor.h"
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#include "Phrase.h"
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#include "TypeDef.h"
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#include "Util.h"
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#include "WordsRange.h"
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#include "FeatureFunction.h"
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#include "FactorTypeSet.h"
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#include "Sentence.h"
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#ifdef WITH_THREADS
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#include <boost/thread/tss.hpp>
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#endif
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namespace Moses
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{
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class Factor;
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class Phrase;
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class Hypothesis;
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class InputType;
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/** Discriminatively trained global lexicon model
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* This is a implementation of Mauser et al., 2009's model that predicts
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* each output word from _all_ the input words. The intuition behind this
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* feature is that it uses context words for disambiguation
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*/
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class GlobalLexicalModel : public StatelessFeatureFunction
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{
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typedef std::map< const Word*, std::map< const Word*, float, WordComparer >, WordComparer > DoubleHash;
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typedef std::map< const Word*, float, WordComparer > SingleHash;
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typedef std::map< const TargetPhrase*, float > LexiconCache;
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struct ThreadLocalStorage
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{
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LexiconCache cache;
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const Sentence *input;
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};
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private:
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DoubleHash m_hash;
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#ifdef WITH_THREADS
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boost::thread_specific_ptr<ThreadLocalStorage> m_local;
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#else
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std::auto_ptr<ThreadLocalStorage> m_local;
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#endif
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Word *m_bias;
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FactorMask m_inputFactors;
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FactorMask m_outputFactors;
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void LoadData(const std::string &filePath,
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const std::vector< FactorType >& inFactors,
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const std::vector< FactorType >& outFactors);
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float ScorePhrase( const TargetPhrase& targetPhrase ) const;
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float GetFromCacheOrScorePhrase( const TargetPhrase& targetPhrase ) const;
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public:
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GlobalLexicalModel(const std::string &line);
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virtual ~GlobalLexicalModel();
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void InitializeForInput( Sentence const& in );
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void Evaluate(const PhraseBasedFeatureContext& context,
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ScoreComponentCollection* accumulator) const;
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void EvaluateChart(
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const ChartBasedFeatureContext& context,
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ScoreComponentCollection* accumulator) const
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{
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std::cerr << "EvaluateChart not implemented." << std::endl;
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exit(1);
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}
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virtual void Evaluate(const TargetPhrase &targetPhrase
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, ScoreComponentCollection &scoreBreakdown
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, ScoreComponentCollection &estimatedFutureScore) const;
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virtual StatelessFeatureType GetStatelessFeatureType() const
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{ return RequiresSource; }
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};
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}
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#endif
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