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/*
* ff_const_reorder.h
*
* Created on: Jul 11, 2013
* Author: junhuili
*/
#ifndef FF_CONST_REORDER_H_
#define FF_CONST_REORDER_H_
#include "ff_factory.h"
#include "ff.h"
struct ConstReorderFeatureImpl;
// Soft reordering constraint features from
// http://www.aclweb.org/anthology/P14-1106. To train the classifers,
// use utils/const_reorder_model_trainer for constituency reordering
// constraints and utils/argument_reorder_model_trainer for SRL
// reordering constraints.
//
// Input segments should provide path to parse tree (resp. SRL parse)
// as "parse" (resp. "srl") properties.
class ConstReorderFeature : public FeatureFunction {
public:
ConstReorderFeature(const std::string& param);
~ConstReorderFeature();
static std::string usage(bool param, bool verbose);
protected:
virtual void PrepareForInput(const SentenceMetadata& smeta);
virtual void TraversalFeaturesImpl(
const SentenceMetadata& smeta, const HG::Edge& edge,
const std::vector<const void*>& ant_contexts,
SparseVector<double>* features, SparseVector<double>* estimated_features,
void* out_context) const;
private:
ConstReorderFeatureImpl* pimpl_;
};
#endif /* FF_CONST_REORDER_H_ */
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