mirror of
https://github.com/moses-smt/mosesdecoder.git
synced 2024-08-16 23:10:31 +03:00
bbf8a615f2
in the manner of: Spence Green, Michel Galley, Christopher D. Manning. 2010. Improved Models of Distortion Cost for Statistical Machine Translation. In NAACL 2010.
58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
#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");
|
|
}
|
|
|
|
};
|
|
}
|
|
|