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#ifndef _FF_TAGGER_H_
#define _FF_TAGGER_H_
#include <map>
#include "ff.h"
typedef std::map<WordID, int> Class2FID;
typedef std::map<WordID, Class2FID> Class2Class2FID;
// the reason this is a "tagger" feature is that it assumes that
// the sequence unfolds from left to right, which means it doesn't
// have to split states based on left context.
// fires unigram features as well
class Tagger_BigramIdentity : public FeatureFunction {
public:
Tagger_BigramIdentity(const std::string& param);
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* context) const;
private:
void FireFeature(const WordID& left,
const WordID& right,
SparseVector<double>* features) const;
mutable Class2Class2FID fmap_;
};
// for each pair of symbols cooccuring in a lexicalized rule, fire
// a feature (mostly used for tagging, but could be used for any model)
class LexicalPairIdentity : public FeatureFunction {
public:
LexicalPairIdentity(const std::string& param);
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* context) const;
private:
void FireFeature(WordID src,
WordID trg,
SparseVector<double>* features) const;
mutable Class2Class2FID fmap_;
};
#endif
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