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) 2009 Soeren Sonnenburg 00008 * Copyright (C) 2009 Fraunhofer Institute FIRST and Max-Planck-Society 00009 */ 00010 00011 #include <shogun/lib/common.h> 00012 #include <shogun/mathematics/Math.h> 00013 #include <shogun/kernel/TensorProductPairKernel.h> 00014 #include <shogun/io/SGIO.h> 00015 00016 using namespace shogun; 00017 00018 CTensorProductPairKernel::CTensorProductPairKernel() 00019 : CDotKernel(0), subkernel(NULL) 00020 { 00021 register_params(); 00022 } 00023 00024 CTensorProductPairKernel::CTensorProductPairKernel(int32_t size, CKernel* s) 00025 : CDotKernel(size), subkernel(s) 00026 { 00027 SG_REF(subkernel); 00028 register_params(); 00029 } 00030 00031 CTensorProductPairKernel::CTensorProductPairKernel(CDenseFeatures<int32_t>* l, CDenseFeatures<int32_t>* r, CKernel* s) 00032 : CDotKernel(10), subkernel(s) 00033 { 00034 SG_REF(subkernel); 00035 init(l, r); 00036 register_params(); 00037 } 00038 00039 CTensorProductPairKernel::~CTensorProductPairKernel() 00040 { 00041 SG_UNREF(subkernel); 00042 cleanup(); 00043 } 00044 00045 bool CTensorProductPairKernel::init(CFeatures* l, CFeatures* r) 00046 { 00047 CDotKernel::init(l, r); 00048 init_normalizer(); 00049 return true; 00050 } 00051 00052 float64_t CTensorProductPairKernel::compute(int32_t idx_a, int32_t idx_b) 00053 { 00054 int32_t alen, blen; 00055 bool afree, bfree; 00056 00057 int32_t* avec=((CDenseFeatures<int32_t>*) lhs)->get_feature_vector(idx_a, alen, afree); 00058 int32_t* bvec=((CDenseFeatures<int32_t>*) rhs)->get_feature_vector(idx_b, blen, bfree); 00059 00060 ASSERT(alen==2) 00061 ASSERT(blen==2) 00062 00063 CKernel* k=subkernel; 00064 ASSERT(k && k->has_features()) 00065 00066 int32_t a=avec[0]; 00067 int32_t b=avec[1]; 00068 int32_t c=bvec[0]; 00069 int32_t d=bvec[1]; 00070 00071 float64_t result = k->kernel(a,c)*k->kernel(b,d) + k->kernel(a,d)*k->kernel(b,c); 00072 00073 ((CDenseFeatures<int32_t>*) lhs)->free_feature_vector(avec, idx_a, afree); 00074 ((CDenseFeatures<int32_t>*) rhs)->free_feature_vector(bvec, idx_b, bfree); 00075 00076 return result; 00077 } 00078 00079 void CTensorProductPairKernel::register_params() 00080 { 00081 SG_ADD((CSGObject**)&subkernel, "subkernel", "the subkernel", MS_AVAILABLE); 00082 }