SHOGUN v0.9.0
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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 "lib/common.h" 00012 #include "lib/Mathematics.h" 00013 #include "kernel/TensorProductPairKernel.h" 00014 #include "features/SimpleFeatures.h" 00015 #include "lib/io.h" 00016 00017 using namespace shogun; 00018 00019 CTensorProductPairKernel::CTensorProductPairKernel(void) 00020 : CDotKernel(0), subkernel(NULL) 00021 { 00022 SG_UNSTABLE("CTensorProductPairKernel::" 00023 "CTensorProductPairKernel(void)", "\n"); 00024 } 00025 00026 CTensorProductPairKernel::CTensorProductPairKernel(int32_t size, CKernel* s) 00027 : CDotKernel(size), subkernel(s) 00028 { 00029 SG_REF(subkernel); 00030 } 00031 00032 CTensorProductPairKernel::CTensorProductPairKernel(CSimpleFeatures<int32_t>* l, CSimpleFeatures<int32_t>* r, CKernel* s) 00033 : CDotKernel(10), subkernel(s) 00034 { 00035 SG_REF(subkernel); 00036 init(l, r); 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=((CSimpleFeatures<int32_t>*) lhs)->get_feature_vector(idx_a, alen, afree); 00058 int32_t* bvec=((CSimpleFeatures<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 ((CSimpleFeatures<int32_t>*) lhs)->free_feature_vector(avec, idx_a, afree); 00074 ((CSimpleFeatures<int32_t>*) rhs)->free_feature_vector(bvec, idx_b, bfree); 00075 00076 return result; 00077 }