/usr/include/shogun/kernel/RationalQuadraticKernel.h is in libshogun-dev 3.1.1-1.
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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) 2011 Rafał Surowiecki
* Copyright (C) 2011 Berlin Institute of Technology and Max-Planck-Society
*/
#include <shogun/lib/config.h>
#ifndef RATIONAL_QUADRATIC_KERNEL_H_
#define RATIONAL_QUADRATIC_KERNEL_H_
#include <shogun/lib/common.h>
#include <shogun/kernel/Kernel.h>
#include <shogun/distance/Distance.h>
namespace shogun
{
class CDistance;
/** @brief Rational Quadratic kernel
*
* Formally described as
*
* \f[
* K(x,x') = 1 -\frac{\| x-x'\|^2}{\|x-x'\|^2 + coef}
* \f]
*
*/
class CRationalQuadraticKernel: public CKernel
{
public:
/** default constructor */
CRationalQuadraticKernel();
/** constructor
* @param cache size of cache
* @param coef kernel parameter coefficient
* @param dist distance to be used
*/
CRationalQuadraticKernel(int32_t cache, float64_t coef, CDistance* dist);
/** constructor
* @param l features left-side
* @param r features right-side
* @param c kernel parameter coefficient
* @param dist distance to be used
*/
CRationalQuadraticKernel(CFeatures *l, CFeatures *r, float64_t c, CDistance* dist);
/** initialize kernel with features
* @param l features left-side
* @param r features right-side
* @return true if successful
*/
virtual bool init(CFeatures* l, CFeatures* r);
/**
* @return kernel type
*/
virtual EKernelType get_kernel_type() { return K_RATIONAL_QUADRATIC; }
/**
* @return type of features
*/
virtual EFeatureType get_feature_type() { return m_distance->get_feature_type(); }
/**
* @return class of features
*/
virtual EFeatureClass get_feature_class() { return m_distance->get_feature_class(); }
/**
* @return name of kernel
*/
virtual const char* get_name() const { return "RationalQuadraticKernel"; }
/**
* @return coef - coefficient parameter of kernel
*/
virtual const float64_t get_coef() const { return m_coef; }
/** setter for degree parameter
* @param coef coefficient parameter of kernel
*/
inline void set_coef(float64_t coef) { m_coef=coef; }
virtual ~CRationalQuadraticKernel();
protected:
/**
* compute kernel for specific feature vectors
* corresponding to [idx_a] of left-side and [idx_b] of right-side
* @param idx_a left-side index
* @param idx_b right-side index
* @return kernel value
*/
virtual float64_t compute(int32_t idx_a, int32_t idx_b);
private:
/**Initialize parameters for serialization*/
void init();
protected:
/// distance to be used
CDistance* m_distance;
/// coefficient parameter of kernel
float64_t m_coef;
};
}
#endif /* RATIONAL_QUADRATIC_KERNEL_H_ */
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