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#ifndef moses_TargetBigramFeature_h
#define moses_TargetBigramFeature_h
#include <string>
#include <map>
#include <boost/unordered_set.hpp>
#include "moses/FF/FFState.h"
#include "StatefulFeatureFunction.h"
#include "moses/FactorCollection.h"
#include "moses/Word.h"
namespace Moses
{
class TargetBigramState : public FFState
{
public:
TargetBigramState(const Word& word): m_word(word) {}
const Word& GetWord() const {
return m_word;
}
size_t hash() const;
virtual bool operator==(const FFState& other) const;
private:
Word m_word;
};
/** Sets the features of observed bigrams.
*/
class TargetBigramFeature : public StatefulFeatureFunction
{
public:
TargetBigramFeature(const std::string &line);
void Load();
bool IsUseable(const FactorMask &mask) const;
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 */,
ScoreComponentCollection* ) const {
throw std::logic_error("TargetBigramFeature not valid in chart decoder");
}
void SetParameter(const std::string& key, const std::string& value);
private:
FactorType m_factorType;
Word m_bos;
std::string m_filePath;
boost::unordered_set<std::string> m_vocab;
};
}
#endif // moses_TargetBigramFeature_h
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