PolyKernel.cpp

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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(&degree, "degree", "Degree of polynomial kernel", MS_AVAILABLE);
00076     SG_ADD(&inhomogene, "inhomogene", "If kernel is inhomogeneous.",
00077             MS_NOT_AVAILABLE);
00078 }
00079 
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