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#ifndef _FF_SPANS_H_
#define _FF_SPANS_H_
#include <vector>
#include <map>
#include "ff.h"
#include "array2d.h"
#include "wordid.h"
class SpanFeatures : public FeatureFunction {
public:
SpanFeatures(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;
virtual void PrepareForInput(const SentenceMetadata& smeta);
private:
WordID MapIfNecessary(const WordID& w) const;
const int kS;
const int kX;
Array2D<int> span_feats_;
std::vector<int> end_span_ids_;
std::vector<int> beg_span_ids_;
std::map<WordID, WordID> word2class_; // optional projection to coarser class
WordID oov_;
};
#endif
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