/usr/include/shogun/distance/CanberraMetric.h is in libshogun-dev 1.1.0-4ubuntu2.
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) 2006-2009 Christian Gehl
* Copyright (C) 2006-2009 Fraunhofer Institute FIRST
*/
#ifndef _CANBERRAMETRIC_H__
#define _CANBERRAMETRIC_H___
#include <shogun/lib/common.h>
#include <shogun/distance/SimpleDistance.h>
#include <shogun/features/SimpleFeatures.h>
namespace shogun
{
template <class T> class CSimpleFeatures;
/** @brief class CanberraMetric
*
* The Canberra distance sums up the dissimilarity (ratios) between feature
* dimensions of two data points.
*
* \f[\displaystyle
* d(\bf{x},\bf{x'}) = \sum_{i=1}^{n}\frac{|\bf{x_{i}-\bf{x'_{i}}}|}
* {|\bf{x_{i}}|+|\bf{x'_{i}}|} \quad \bf{x},\bf{x'} \in R^{n}
* \f]
*
* A summation element has range [0,1]. Note that \f$d(x,0)=d(0,x')=n\f$
* and \f$d(0,0)=0\f$.
*/
class CCanberraMetric: public CSimpleDistance<float64_t>
{
public:
/** default constructor */
CCanberraMetric();
/** constructor
*
* @param l features of left-hand side
* @param r features of right-hand side
*/
CCanberraMetric(CSimpleFeatures<float64_t>* l, CSimpleFeatures<float64_t>* r);
virtual ~CCanberraMetric();
/** 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 CANBERRA
*/
virtual EDistanceType get_distance_type() { return D_CANBERRA; }
/** get name of the distance
*
* @return name Canberra-Metric
*/
virtual const char* get_name() const { return "CanberraMetric"; }
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 /* _CANBERRAMETRIC_H__ */
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