FirstElementKernelNormalizer.h

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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) 2008-2009 Soeren Sonnenburg
00008  * Copyright (C) 2008-2009 Fraunhofer Institute FIRST and Max-Planck-Society
00009  */
00010 
00011 #ifndef _FIRSTELEMENTKERNELNORMALIZER_H___
00012 #define _FIRSTELEMENTKERNELNORMALIZER_H___
00013 
00014 #include <shogun/kernel/normalizer/KernelNormalizer.h>
00015 
00016 namespace shogun
00017 {
00028 class CFirstElementKernelNormalizer : public CKernelNormalizer
00029 {
00030     public:
00033         CFirstElementKernelNormalizer() : CKernelNormalizer(), scale(1.0)
00034         {
00035             SG_ADD(&scale, "scale", "Scale quotient by which kernel is scaled.",
00036                 MS_AVAILABLE);
00037         }
00038 
00040         virtual ~CFirstElementKernelNormalizer()
00041         {
00042         }
00043 
00046         virtual bool init(CKernel* k)
00047         {
00048             CFeatures* old_lhs=k->lhs;
00049             CFeatures* old_rhs=k->rhs;
00050             k->lhs=old_lhs;
00051             k->rhs=old_lhs;
00052 
00053             scale=k->compute(0, 0);
00054 
00055             k->lhs=old_lhs;
00056             k->rhs=old_rhs;
00057 
00058             return true;
00059         }
00060 
00066         virtual float64_t normalize(
00067             float64_t value, int32_t idx_lhs, int32_t idx_rhs)
00068         {
00069             return value/scale;
00070         }
00071 
00076         virtual float64_t normalize_lhs(float64_t value, int32_t idx_lhs)
00077         {
00078             return value/sqrt(scale);
00079         }
00080 
00085         virtual float64_t normalize_rhs(float64_t value, int32_t idx_rhs)
00086         {
00087             return value/sqrt(scale);
00088         }
00089 
00091         virtual const char* get_name() const { return "FirstElementKernelNormalizer"; }
00092 
00093     protected:
00095         float64_t scale;
00096 };
00097 }
00098 #endif
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