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src
shogun
kernel
CauchyKernel.cpp
浏览该文件的文档.
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* Written (W) 2011 Sergey Lisitsyn
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* Copyright (C) 2007-2011 Fraunhofer Institute FIRST and Max-Planck-Society
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*/
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#include <
shogun/kernel/CauchyKernel.h
>
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#include <
shogun/mathematics/Math.h
>
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using namespace
shogun;
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CCauchyKernel::CCauchyKernel
():
CKernel
(0), m_distance(NULL), m_sigma(1.0)
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{
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init
();
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}
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CCauchyKernel::CCauchyKernel
(int32_t cache,
float64_t
sigma,
CDistance
* dist)
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:
CKernel
(cache), m_distance(dist), m_sigma(sigma)
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{
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init
();
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ASSERT
(
m_distance
)
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SG_REF
(
m_distance
);
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}
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CCauchyKernel::CCauchyKernel
(
CFeatures
*l,
CFeatures
*r,
float64_t
sigma,
CDistance
* dist)
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:
CKernel
(10), m_distance(dist), m_sigma(sigma)
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{
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init
();
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ASSERT
(
m_distance
)
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SG_REF
(
m_distance
);
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init
(l, r);
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}
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CCauchyKernel::~CCauchyKernel
()
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{
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cleanup
();
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SG_UNREF
(
m_distance
);
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}
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bool
CCauchyKernel::init(
CFeatures
* l,
CFeatures
* r)
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{
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ASSERT
(
m_distance
)
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CKernel::init(l,r);
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m_distance
->
init
(l,r);
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return
init_normalizer
();
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}
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void
CCauchyKernel::init()
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{
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SG_ADD
(&
m_sigma
,
"sigma"
,
"Sigma kernel parameter."
,
MS_AVAILABLE
);
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SG_ADD
((
CSGObject
**) &
m_distance
,
"distance"
,
"Distance to be used."
,
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MS_AVAILABLE
);
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}
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float64_t
CCauchyKernel::compute
(int32_t idx_a, int32_t idx_b)
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{
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float64_t
dist =
m_distance
->
distance
(idx_a, idx_b);
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return
1.0/(1.0+dist*dist/
m_sigma
);
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}
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