/usr/include/shogun/kernel/WaveletKernel.h is in libshogun-dev 1.1.0-4ubuntu2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 | /*
* 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 Siddharth Kherada
* Copyright (C) 2007-2011 Fraunhofer Institute FIRST and Max-Planck-Society
*/
#ifndef _WAVELETKERNEL_H___
#define _WAVELETKERNEL_H___
#include <shogun/lib/common.h>
#include <shogun/kernel/DotKernel.h>
#include <shogun/features/DotFeatures.h>
namespace shogun
{
/** @brief the class WaveletKernel
*
* It is defined as
*
* \f[
* k({\bf x},({\bf x'})= \prod_{i=0}^{l}h(\frac{(x-c)}{a})\cdot h(\frac{(x'-c)}{a})
* \f]
*
* Where \f$h(x)\f$ is the mother wavelet function
*
* \f[
* h({\bf x}=cos(1.75*x)\cdot exp(\frac{(-x^2)}{2})
* \f]
*
*/
class CWaveletKernel: public CDotKernel
{
public:
/** default constructor */
CWaveletKernel();
/** constructor
*
* @param size cache size
* @param Wdilation is Dilation coefficient
* @param Wtranslation is Translation coefficient
*/
CWaveletKernel(int32_t size, float64_t Wdilation, float64_t Wtranslation);
/** constructor
*
* @param l features of left-hand side
* @param r features of right-hand side
* @param size cache size
* @param Wdilation is Dilation coefficient
* @param Wtranslation is Translation coefficient
*/
CWaveletKernel(CDotFeatures* l, CDotFeatures* r, int32_t size,float64_t Wdilation, float64_t Wtranslation);
virtual ~CWaveletKernel();
/** initialize kernel
*
* @param l features of left-hand side
* @param r features of right-hand side
* @return if initializing was successful
*/
virtual bool init(CFeatures* l, CFeatures* r);
virtual void cleanup();
/** return what type of kernel we are
*
* @return kernel type wavelet
*/
virtual EKernelType get_kernel_type() { return K_WAVELET; }
/** return the kernel's name
*
* @return name Wavelet
*/
virtual const char* get_name() const { return "WaveletKernel"; }
protected:
/** compute kernel function for features a and b
* idx_{a,b} denote the index of the feature vectors
* in the corresponding feature object
*
* @param idx_a index a
* @param idx_b index b
* @return computed kernel function at indices a,b
*/
virtual float64_t compute(int32_t idx_a, int32_t idx_b);
protected:
/** h(x) is a mother wavelet function */
inline float64_t MotherWavelet(float64_t h)
{
return cos(1.75*h)*exp(-h*h/2);
}
private:
void init();
protected:
/** dilation coefficient */
float64_t Wdilation;
/** translation coefficient */
float64_t Wtranslation;
};
}
#endif /* _WAVELETKERNEL_H__ */
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