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#ifndef _LM_FF_H_
#define _LM_FF_H_
#include <vector>
#include <string>
#include "hg.h"
#include "ff.h"
#include "config.h"
class LanguageModelImpl;
class LanguageModel : public FeatureFunction {
public:
// param = "filename.lm [-o n]"
LanguageModel(const std::string& param);
~LanguageModel();
virtual void FinalTraversalFeatures(const void* context,
SparseVector<double>* features) const;
std::string DebugStateToString(const void* state) const;
static std::string usage(bool param,bool verbose);
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
mutable LanguageModelImpl* pimpl_;
};
#ifdef HAVE_RANDLM
class LanguageModelRandLM : public FeatureFunction {
public:
// param = "filename.lm [-o n]"
LanguageModelRandLM(const std::string& param);
~LanguageModelRandLM();
virtual void FinalTraversalFeatures(const void* context,
SparseVector<double>* features) const;
std::string DebugStateToString(const void* state) 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:
const int fid_;
mutable LanguageModelImpl* pimpl_;
};
#endif
#endif
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