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 
00023 class CSigmoidKernel: public CSimpleKernel<float64_t>
00024 {
00025     public:
00032         CSigmoidKernel(int32_t size, float64_t gamma, float64_t coef0);
00033 
00042         CSigmoidKernel(CRealFeatures* l, CRealFeatures* r, int32_t size,
00043             float64_t gamma, float64_t coef0);
00044 
00045         virtual ~CSigmoidKernel();
00046 
00053         virtual bool init(CFeatures* l, CFeatures* r);
00054 
00056         virtual void cleanup();
00057 
00063         virtual bool load_init(FILE* src);
00064 
00070         virtual bool save_init(FILE* dest);
00071 
00076         virtual EKernelType get_kernel_type() { return K_SIGMOID; }
00077 
00082         virtual const char* get_name() { return "Sigmoid"; }
00083 
00084     protected:
00093         virtual float64_t compute(int32_t idx_a, int32_t idx_b);
00094 
00095     protected:
00097         float64_t gamma;
00099         float64_t coef0;
00100 };
00101 
00102 #endif /* _SIGMOIDKERNEL_H__ */

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