/usr/include/shogun/distance/JensenMetric.h is in libshogun-dev 3.2.0-7.3build4.
This file is owned by root:root, with mode 0o644.
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* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Written (W) 2006-2009 Christian Gehl
* Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
*/
#ifndef _JENSENMETRIC_H___
#define _JENSENMETRIC_H___
#include <shogun/lib/common.h>
#include <shogun/distance/DenseDistance.h>
namespace shogun
{
/** @brief class JensenMetric
*
* The Jensen-Shannon distance/divergence measures the similarity between
* two data points which is based on the Kullback-Leibler divergence.
*
* \f[\displaystyle
* d(\bf{x},\bf{x'}) = \sum_{i=0}^{n} x_{i} log\frac{x_{i}}{0.5(x_{i}
* +x'_{i})} + x'_{i} log\frac{x'_{i}}{0.5(x_{i}+x'_{i})}
* \f]
*
* @see <a href="http://en.wikipedia.org/wiki/Jensen-Shannon_divergence">
* Wikipedia: Jensen-Shannon divergence</a>
* @see <a href="http://en.wikipedia.org/wiki/Kullback-Leibler_divergence">
* Wikipedia: Kullback-Leibler divergence</a>
*/
class CJensenMetric: public CDenseDistance<float64_t>
{
public:
/** default constructor */
CJensenMetric();
/** constructor
*
* @param l features of left-hand side
* @param r features of right-hand side
*/
CJensenMetric(CDenseFeatures<float64_t>* l, CDenseFeatures<float64_t>* r);
virtual ~CJensenMetric();
/** init distance
*
* @param l features of left-hand side
* @param r features of right-hand side
* @return if init was successful
*/
virtual bool init(CFeatures* l, CFeatures* r);
/** cleanup distance */
virtual void cleanup();
/** get distance type we are
*
* @return distance type JENSEN
*/
virtual EDistanceType get_distance_type() { return D_JENSEN; }
/** get name of the distance
*
* @return name Jensen-Metric
*/
virtual const char* get_name() const { return "JensenMetric"; }
protected:
/// compute distance for features a and b
/// idx_{a,b} denote the index of the feature vectors
/// in the corresponding feature object
virtual float64_t compute(int32_t idx_a, int32_t idx_b);
};
} // namespace shogun
#endif /* _JENSENMETRIC_H___ */
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