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#pragma once
#include <string>
#include "StatefulFeatureFunction.h"
#include "moses/Range.h"
namespace Moses
{
/** Calculates Distortion scores
*/
class DistortionScoreProducer : public StatefulFeatureFunction
{
protected:
static std::vector<const DistortionScoreProducer*> s_staticColl;
FactorType m_sparseFactorTypeSource;
FactorType m_sparseFactorTypeTarget;
bool m_useSparse;
bool m_sparseDistance;
bool m_sparseSubordinate;
FactorType m_sparseFactorTypeTargetSubordinate;
const Factor* m_subordinateConjunctionTagFactor;
public:
static const std::vector<const DistortionScoreProducer*>& GetDistortionFeatureFunctions() {
return s_staticColl;
}
DistortionScoreProducer(const std::string &line);
void SetParameter(const std::string& key, const std::string& value);
bool IsUseable(const FactorMask &mask) const {
return true;
}
static float CalculateDistortionScore(const Hypothesis& hypo,
const Range &prev, const Range &curr, const int FirstGapPosition);
virtual const FFState* EmptyHypothesisState(const InputType &input) const;
virtual FFState* EvaluateWhenApplied(
const Hypothesis& cur_hypo,
const FFState* prev_state,
ScoreComponentCollection* accumulator) const;
virtual FFState* EvaluateWhenApplied(
const ChartHypothesis& /* cur_hypo */,
int /* featureID - used to index the state in the previous hypotheses */,
ScoreComponentCollection*) const {
UTIL_THROW(util::Exception, "DIstortion not implemented in chart decoder");
}
};
}
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