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46 lines
1.2 KiB
C++
46 lines
1.2 KiB
C++
#pragma once
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#include "FeatureFunction.h"
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namespace Moses
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{
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/** base class for all stateless feature functions.
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* eg. phrase table, word penalty, phrase penalty
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*/
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class StatelessFeatureFunction: public FeatureFunction
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{
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//All stateless FFs, except those that cache scores in T-Option
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static std::vector<const StatelessFeatureFunction*> m_statelessFFs;
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public:
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static const std::vector<const StatelessFeatureFunction*>& GetStatelessFeatureFunctions() {
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return m_statelessFFs;
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}
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StatelessFeatureFunction(const std::string& description, const std::string &line);
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StatelessFeatureFunction(const std::string& description, size_t numScoreComponents, const std::string &line);
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/**
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* This should be implemented for features that apply to phrase-based models.
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**/
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virtual void Evaluate(const PhraseBasedFeatureContext& context,
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ScoreComponentCollection* accumulator) const {
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}
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/**
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* Same for chart-based features.
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**/
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virtual void EvaluateChart(const ChartBasedFeatureContext& context,
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ScoreComponentCollection* accumulator) const {
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}
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virtual bool IsStateless() const {
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return true;
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}
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};
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} // namespace
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