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src
shogun
kernel
BesselKernel.cpp
Go to the documentation of this file.
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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 Zi Yuan
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* Copyright (C) 2011 Berlin Institute of Technology and Max-Planck-Society
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*/
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#include <
shogun/kernel/BesselKernel.h
>
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#include <
shogun/mathematics/Math.h
>
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#include <math.h>
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using namespace
shogun;
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CBesselKernel::CBesselKernel
():
CDistanceKernel
(),order(0.0),degree(0)
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{
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init
();
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}
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CBesselKernel::CBesselKernel
(int32_t size,
float64_t
v,
float64_t
w,
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int32_t n,
CDistance
* dist) :
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CDistanceKernel
(size,w,dist), order(v), degree(n)
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{
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ASSERT
(
distance
)
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SG_REF
(
distance
);
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init
();
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}
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CBesselKernel::CBesselKernel
(
CFeatures
* l,
CFeatures
* r,
float64_t
v,
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float64_t
w, int32_t n,
CDistance
* dist, int32_t size) :
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CDistanceKernel
(size,w,dist), order(v), degree(n)
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{
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init
();
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ASSERT
(
distance
)
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SG_REF
(
distance
);
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init
(l,r);
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}
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CBesselKernel::~CBesselKernel
()
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{
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cleanup
();
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SG_UNREF
(
distance
);
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}
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void
CBesselKernel::cleanup
()
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{
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}
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bool
CBesselKernel::init(
CFeatures
* l,
CFeatures
* r)
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{
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ASSERT
(
distance
)
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CDistanceKernel::init(l,r);
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distance
->
init
(l,r);
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return
init_normalizer
();
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}
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void
CBesselKernel::init()
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{
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SG_ADD
(&
order
,
"order"
,
"Kernel order."
,
MS_AVAILABLE
);
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SG_ADD
(&
degree
,
"degree"
,
"Kernel degree."
,
MS_AVAILABLE
);
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}
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float64_t
CBesselKernel::compute
(int32_t idx_a, int32_t idx_b)
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{
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float64_t
dist =
distance
->
distance
(idx_a, idx_b);
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return
jn(
order
,dist/
width
)/
CMath::pow
(dist,-
degree
*
order
);
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}
SHOGUN
Machine Learning Toolbox - Documentation