SHOGUN
v3.2.0
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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) 1999-2010 Soeren Sonnenburg 00008 * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society 00009 * Copyright (C) 2010 Berlin Institute of Technology 00010 */ 00011 00012 #include <shogun/lib/config.h> 00013 #include <shogun/lib/common.h> 00014 #include <shogun/io/SGIO.h> 00015 #include <shogun/kernel/PolyKernel.h> 00016 #include <shogun/kernel/normalizer/SqrtDiagKernelNormalizer.h> 00017 #include <shogun/features/DotFeatures.h> 00018 00019 using namespace shogun; 00020 00021 CPolyKernel::CPolyKernel() 00022 : CDotKernel(0), degree(0), inhomogene(false) 00023 { 00024 init(); 00025 00026 } 00027 00028 CPolyKernel::CPolyKernel(int32_t size, int32_t d, bool i) 00029 : CDotKernel(size), degree(d), inhomogene(i) 00030 { 00031 init(); 00032 } 00033 00034 CPolyKernel::CPolyKernel( 00035 CDotFeatures* l, CDotFeatures* r, int32_t d, bool i, int32_t size) 00036 : CDotKernel(size), degree(d), inhomogene(i) 00037 { 00038 init(); 00039 init(l,r); 00040 } 00041 00042 CPolyKernel::~CPolyKernel() 00043 { 00044 cleanup(); 00045 } 00046 00047 bool CPolyKernel::init(CFeatures* l, CFeatures* r) 00048 { 00049 CDotKernel::init(l,r); 00050 return init_normalizer(); 00051 } 00052 00053 void CPolyKernel::cleanup() 00054 { 00055 CKernel::cleanup(); 00056 } 00057 00058 float64_t CPolyKernel::compute(int32_t idx_a, int32_t idx_b) 00059 { 00060 float64_t result=CDotKernel::compute(idx_a, idx_b); 00061 00062 if (inhomogene) 00063 result+=1; 00064 00065 return CMath::pow(result, degree); 00066 } 00067 00068 void CPolyKernel::init() 00069 { 00070 set_normalizer(new CSqrtDiagKernelNormalizer()); 00071 SG_ADD(°ree, "degree", "Degree of polynomial kernel", MS_AVAILABLE); 00072 SG_ADD(&inhomogene, "inhomogene", "If kernel is inhomogeneous.", 00073 MS_NOT_AVAILABLE); 00074 } 00075