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#ifndef _KLM_FF_H_
#define _KLM_FF_H_
#include <vector>
#include <string>
#include "ff.h"
#include "lm/model.hh"
template <class Model> struct KLanguageModelImpl;
// the supported template types are instantiated explicitly
// in ff_klm.cc.
template <class Model>
class KLanguageModel : public FeatureFunction {
public:
// param = "filename.lm [-o n]"
KLanguageModel(const std::string& param);
~KLanguageModel();
virtual void FinalTraversalFeatures(const void* context,
SparseVector<double>* features) const;
static std::string usage(bool param,bool verbose);
Features features() const;
protected:
virtual void TraversalFeaturesImpl(const SentenceMetadata& smeta,
const Hypergraph::Edge& edge,
const std::vector<const void*>& ant_contexts,
SparseVector<double>* features,
SparseVector<double>* estimated_features,
void* out_context) const;
private:
int fid_; // conceptually const; mutable only to simplify constructor
int oov_fid_; // will be zero if extra OOV feature is not configured by decoder
KLanguageModelImpl<Model>* pimpl_;
};
#endif
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