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) 1999-2008 Soeren Sonnenburg 00008 * Copyright (C) 1999-2008 Fraunhofer Institute FIRST and Max-Planck-Society 00009 */ 00010 00011 #ifndef _SIGMOIDKERNEL_H___ 00012 #define _SIGMOIDKERNEL_H___ 00013 00014 #include "lib/common.h" 00015 #include "kernel/SimpleKernel.h" 00016 #include "features/RealFeatures.h" 00017 00019 class CSigmoidKernel: public CSimpleKernel<DREAL> 00020 { 00021 public: 00028 CSigmoidKernel(INT size, DREAL gamma, DREAL coef0); 00029 00038 CSigmoidKernel(CRealFeatures* l, CRealFeatures* r, INT size, 00039 DREAL gamma, DREAL coef0); 00040 00041 virtual ~CSigmoidKernel(); 00042 00049 virtual bool init(CFeatures* l, CFeatures* r); 00050 00052 virtual void cleanup(); 00053 00059 virtual bool load_init(FILE* src); 00060 00066 virtual bool save_init(FILE* dest); 00067 00072 virtual EKernelType get_kernel_type() { return K_SIGMOID; } 00073 00078 virtual const CHAR* get_name() { return "Sigmoid" ; } ; 00079 00080 protected: 00089 virtual DREAL compute(INT idx_a, INT idx_b); 00090 00091 protected: 00093 double gamma; 00095 double coef0; 00096 }; 00097 00098 #endif /* _SIGMOIDKERNEL_H__ */