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) 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 set_normalizer(new CSqrtDiagKernelNormalizer()); 00027 } 00028 00029 CPolyKernel::CPolyKernel(int32_t size, int32_t d, bool i) 00030 : CDotKernel(size), degree(d), inhomogene(i) 00031 { 00032 init(); 00033 00034 set_normalizer(new CSqrtDiagKernelNormalizer()); 00035 } 00036 00037 CPolyKernel::CPolyKernel( 00038 CDotFeatures* l, CDotFeatures* r, int32_t d, bool i, int32_t size) 00039 : CDotKernel(size), degree(d), inhomogene(i) 00040 { 00041 init(); 00042 00043 set_normalizer(new CSqrtDiagKernelNormalizer()); 00044 init(l,r); 00045 } 00046 00047 CPolyKernel::~CPolyKernel() 00048 { 00049 cleanup(); 00050 } 00051 00052 bool CPolyKernel::init(CFeatures* l, CFeatures* r) 00053 { 00054 CDotKernel::init(l,r); 00055 return init_normalizer(); 00056 } 00057 00058 void CPolyKernel::cleanup() 00059 { 00060 CKernel::cleanup(); 00061 } 00062 00063 float64_t CPolyKernel::compute(int32_t idx_a, int32_t idx_b) 00064 { 00065 float64_t result=CDotKernel::compute(idx_a, idx_b); 00066 00067 if (inhomogene) 00068 result+=1; 00069 00070 return CMath::pow(result, degree); 00071 } 00072 00073 void CPolyKernel::init() 00074 { 00075 SG_ADD(°ree, "degree", "Degree of polynomial kernel", MS_AVAILABLE); 00076 SG_ADD(&inhomogene, "inhomogene", "If kernel is inhomogeneous.", 00077 MS_NOT_AVAILABLE); 00078 } 00079