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55 lines
1.2 KiB
C++
55 lines
1.2 KiB
C++
//
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#ifndef moses_SyntacticLanguageModel_h
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#define moses_SyntacticLanguageModel_h
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#include "FeatureFunction.h"
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#include <stdexcept>
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class YModel; // hidden model
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class XModel; // observed model
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namespace Moses
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{
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template <class MH, class MO> class SyntacticLanguageModelFiles;
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class SyntacticLanguageModel : public StatefulFeatureFunction
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{
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public:
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SyntacticLanguageModel(const std::string &line);
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~SyntacticLanguageModel();
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size_t GetNumScoreComponents() const;
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const FFState* EmptyHypothesisState(const InputType &input) const;
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FFState* Evaluate(const Hypothesis& cur_hypo,
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const FFState* prev_state,
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ScoreComponentCollection* accumulator) const;
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FFState* EvaluateWhenApplied(const ChartHypothesis& cur_hypo,
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int featureID,
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ScoreComponentCollection* accumulator) const {
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throw std::runtime_error("Syntactic LM can only be used with phrase-based decoder.");
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}
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// double perplexity();
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private:
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const size_t m_NumScoreComponents;
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SyntacticLanguageModelFiles<YModel,XModel>* m_files;
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const FactorType m_factorType;
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const size_t m_beamWidth;
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};
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}
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#endif
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