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 Soeren Sonnenburg 00008 * Copyright (C) 2008 Fraunhofer Institute FIRST and Max-Planck-Society 00009 */ 00010 00011 #ifndef _FIRSTELEMENTKERNELNORMALIZER_H___ 00012 #define _FIRSTELEMENTKERNELNORMALIZER_H___ 00013 00014 #include "kernel/KernelNormalizer.h" 00015 00026 class CFirstElementKernelNormalizer : public CKernelNormalizer 00027 { 00028 public: 00031 CFirstElementKernelNormalizer() 00032 { 00033 } 00034 00036 virtual ~CFirstElementKernelNormalizer() 00037 { 00038 } 00039 00042 virtual bool init(CKernel* k) 00043 { 00044 CFeatures* old_lhs=k->lhs; 00045 CFeatures* old_rhs=k->rhs; 00046 k->lhs=old_lhs; 00047 k->rhs=old_lhs; 00048 00049 scale=k->compute(0, 0); 00050 00051 k->lhs=old_lhs; 00052 k->rhs=old_rhs; 00053 00054 return true; 00055 } 00056 00062 inline virtual float64_t normalize( 00063 float64_t value, int32_t idx_lhs, int32_t idx_rhs) 00064 { 00065 return value/scale; 00066 } 00067 00072 inline virtual float64_t normalize_lhs(float64_t value, int32_t idx_lhs) 00073 { 00074 return value/sqrt(scale); 00075 } 00076 00081 inline virtual float64_t normalize_rhs(float64_t value, int32_t idx_rhs) 00082 { 00083 return value/sqrt(scale); 00084 } 00085 00086 protected: 00088 float64_t scale; 00089 }; 00090 00091 #endif