/usr/include/shogun/distance/TanimotoDistance.h is in libshogun-dev 3.2.0-7.3build4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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) 2008-2009 Christian Gehl
* Copyright (C) 2008-2009 Fraunhofer Institute FIRST
*/
#ifndef _TANIMOTODISTANCE_H___
#define _TANIMOTODISTANCE_H___
#include <shogun/lib/common.h>
#include <shogun/distance/DenseDistance.h>
namespace shogun
{
/** @brief class Tanimoto coefficient
*
* The Tanimoto distance/coefficient (extended Jaccard coefficient)
* is obtained by extending the cosine similarity.
*
* \f[\displaystyle
* d(\bf{x},\bf{x'}) = \frac{\sum_{i=1}^{n}x_{i}x'_{i}}{
* \sum_{i=1}^{n}x_{i}x_{i}x'_{i}x'_{i}-x_{i}x'_{i}}
* /quad x,x' /in R^{n}
* \f]
*
* @see <a href="http://en.wikipedia.org/wiki/Jaccard_index">Wikipedia:
* Tanimoto coefficient</a>
* @see CCosineDistance
*/
class CTanimotoDistance: public CDenseDistance<float64_t>
{
public:
/** default constructor */
CTanimotoDistance();
/** constructor
*
* @param l features of left-hand side
* @param r features of right-hand side
*/
CTanimotoDistance(CDenseFeatures<float64_t>* l, CDenseFeatures<float64_t>* r);
virtual ~CTanimotoDistance();
/** 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 TANIMOTO
*/
virtual EDistanceType get_distance_type() { return D_TANIMOTO; }
/** get name of the distance
*
* @return name Tanimoto coefficient/distance
*/
virtual const char* get_name() const { return "TanimotoDistance"; }
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 /* _TANIMOTODISTANCE_H___ */
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