SHOGUN
v2.0.0
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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 Jakub Jirku 00008 * Copyright (C) 2007-2011 Fraunhofer Institute FIRST and Max-Planck-Society 00009 */ 00010 00011 #include <shogun/kernel/PowerKernel.h> 00012 #include <shogun/mathematics/Math.h> 00013 00014 using namespace shogun; 00015 00016 CPowerKernel::CPowerKernel(): CKernel(0), distance(NULL), m_degree(1.8) 00017 { 00018 init(); 00019 } 00020 00021 CPowerKernel::CPowerKernel(int32_t cache, float64_t degree, CDistance* dist) 00022 : CKernel(cache), distance(dist), m_degree(degree) 00023 { 00024 init(); 00025 ASSERT(distance); 00026 SG_REF(distance); 00027 } 00028 00029 CPowerKernel::CPowerKernel(CFeatures *l, CFeatures *r, float64_t degree, CDistance* dist) 00030 : CKernel(10), distance(dist), m_degree(degree) 00031 { 00032 init(); 00033 ASSERT(distance); 00034 SG_REF(distance); 00035 init(l, r); 00036 } 00037 00038 CPowerKernel::~CPowerKernel() 00039 { 00040 cleanup(); 00041 SG_UNREF(distance); 00042 } 00043 00044 bool CPowerKernel::init(CFeatures* l, CFeatures* r) 00045 { 00046 ASSERT(distance); 00047 CKernel::init(l,r); 00048 distance->init(l,r); 00049 return init_normalizer(); 00050 } 00051 00052 void CPowerKernel::init() 00053 { 00054 SG_ADD(&m_degree, "degree", "Degree kernel parameter.", MS_AVAILABLE); 00055 SG_ADD((CSGObject**) &distance, "distance", "Distance to be used.", 00056 MS_AVAILABLE); 00057 } 00058 00059 float64_t CPowerKernel::compute(int32_t idx_a, int32_t idx_b) 00060 { 00061 float64_t dist = distance->distance(idx_a, idx_b); 00062 float64_t temp = pow(dist, m_degree); 00063 return -temp; 00064 }