BesselKernel.cpp

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00001 /*
00002  * This program is free software; you can redistribute it and/or modify
00003  * it under the terms of the GNU General Public License as published by
00004  * the Free Software Foundation; either version 3 of the License, or
00005  * (at your option) any later version.
00006  *
00007  * Written (W) 2011 Zi Yuan
00008  * Copyright (C) 2011 Berlin Institute of Technology and Max-Planck-Society
00009  */
00010 
00011 #include <shogun/kernel/BesselKernel.h>
00012 #include <shogun/mathematics/Math.h>
00013 #include <math.h>
00014 
00015 using namespace shogun;
00016 
00017 CBesselKernel::CBesselKernel():CDistanceKernel(),order(0.0),degree(0)
00018 {
00019     init();
00020 }
00021 
00022 CBesselKernel::CBesselKernel(int32_t size, float64_t v, float64_t w,
00023         int32_t n, CDistance* dist) :
00024     CDistanceKernel(size,w,dist), order(v), degree(n)
00025 {
00026     ASSERT(distance);
00027     SG_REF(distance);
00028     init();
00029 }
00030 
00031 CBesselKernel::CBesselKernel(CFeatures* l, CFeatures* r, float64_t v,
00032         float64_t w, int32_t n, CDistance* dist, int32_t size) :
00033     CDistanceKernel(size,w,dist), order(v), degree(n)
00034 {
00035     init();
00036     ASSERT(distance);
00037     SG_REF(distance);
00038     init(l,r);
00039 }
00040 
00041 CBesselKernel::~CBesselKernel()
00042 {
00043     cleanup();
00044     SG_UNREF(distance);
00045 }
00046 
00047 void CBesselKernel::cleanup()
00048 {
00049 }
00050 
00051 bool CBesselKernel::init(CFeatures* l, CFeatures* r)
00052 {
00053     ASSERT(distance);
00054     CDistanceKernel::init(l,r);
00055     distance->init(l,r);
00056     return init_normalizer();
00057 }
00058 
00059 void CBesselKernel::init()
00060 {
00061     m_parameters->add(&order, "order", "Kernel order.");
00062     m_parameters->add(&width, "width", "Kernel width.");
00063     m_parameters->add(&degree, "degree", "Kernel degree.");
00064     m_parameters->add((CSGObject**) &distance, "distance", "Distance to be used.");
00065 }
00066 
00067 float64_t CBesselKernel::compute(int32_t idx_a, int32_t idx_b)
00068 {
00069     float64_t dist = distance->distance(idx_a, idx_b);
00070     return jn(order,dist/width)/CMath::pow(dist,-degree*order);
00071 }
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