/usr/include/shogun/kernel/DiagKernel.h is in libshogun-dev 1.1.0-4ubuntu2.
This file is owned by root:root, with mode 0o644.
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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) 1999-2009 Soeren Sonnenburg
* Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
*/
#ifndef _DIAGKERNEL_H___
#define _DIAGKERNEL_H___
#include <shogun/lib/common.h>
#include <shogun/kernel/Kernel.h>
namespace shogun
{
/** @brief The Diagonal Kernel returns a constant for the diagonal and zero
* otherwise.
*
* A kernel that returns zero for all non-diagonal elements and a single
* constant otherwise, i.e.\f$k({\bf x_i}, {\bf x_j})= \delta_{ij} c\f$
*
*/
class CDiagKernel: public CKernel
{
public:
/** default constructor */
CDiagKernel();
/** constructor
*
* @param size cache size
* @param diag diagonal
*/
CDiagKernel(int32_t size, float64_t diag=1.0);
/** constructor
*
* @param l features of left-hand side
* @param r features of right-hand side
* @param diag diagonal
*/
CDiagKernel(CFeatures* l, CFeatures* r, float64_t diag=1.0);
virtual ~CDiagKernel();
/** 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);
/** return feature type the kernel can deal with
*
* @return feature type ANY
*/
inline virtual EFeatureType get_feature_type()
{
return F_ANY;
}
/** return feature class the kernel can deal with
*
* @return feature class ANY
*/
inline virtual EFeatureClass get_feature_class()
{
return C_ANY;
}
/** return what type of kernel we are
*
* @return kernel type CUSTOM
*/
virtual EKernelType get_kernel_type() { return K_DIAG; }
/** return the kernel's name
*
* @return name Custom
*/
virtual const char* get_name() const { return "DiagKernel"; }
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
*/
inline virtual float64_t compute(int32_t idx_a, int32_t idx_b)
{
if (idx_a==idx_b)
return diag;
else
return 0;
}
private:
void init();
protected:
/** diagonal */
float64_t diag;
};
}
#endif /* _DIAGKERNEL_H__ */
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