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HammingWordDistance.h
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HammingWordDistance.h
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/*
* This software is distributed under BSD 3-clause license (see LICENSE file).
*
* Authors: Soeren Sonnenburg, Yuyu Zhang
*/
#ifndef _HAMMINGWORDDISTANCE_H___
#define _HAMMINGWORDDISTANCE_H___
#include <shogun/lib/config.h>
#include <shogun/lib/common.h>
#include <shogun/features/Features.h>
#include <shogun/features/StringFeatures.h>
#include <shogun/distance/StringDistance.h>
namespace shogun
{
template <class T> class StringFeatures;
/** @brief class HammingWordDistance */
class HammingWordDistance: public StringDistance<uint16_t>
{
public:
/** default constructor */
HammingWordDistance();
/** constructor
*
* @param use_sign if sign shall be used
*/
HammingWordDistance(bool use_sign);
/** constructor
*
* @param l features of left-hand side
* @param r features of right-hand side
* @param use_sign if sign shall be used
*/
HammingWordDistance(const std::shared_ptr<StringFeatures<uint16_t>>& l, const std::shared_ptr<StringFeatures<uint16_t>>& r, bool use_sign);
~HammingWordDistance() override;
/** init distance
*
* @param l features of left-hand side
* @param r features of right-hand side
* @return if init was successful
*/
bool init(std::shared_ptr<Features> l, std::shared_ptr<Features> r) override;
/** cleanup distance */
void cleanup() override;
/** get distance type we are
*
* @return distance type HAMMINGWORD
*/
EDistanceType get_distance_type() override { return D_HAMMINGWORD; }
/** get name of the distance
*
* @return name HammingWord
*/
const char* get_name() const override { return "HammingWordDistance"; }
protected:
/// compute kernel function for features a and b
/// idx_{a,b} denote the index of the feature vectors
/// in the corresponding feature object
float64_t compute(int32_t idx_a, int32_t idx_b) override;
private:
void init();
protected:
/** if sign shall be used */
bool use_sign;
};
} // namespace shogun
#endif /* _HAMMINGWORDDISTANCE_H___ */