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