SigmoidKernel.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) 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__ */

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