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) 1999-2009 Soeren Sonnenburg
00008  * Copyright (C) 1999-2009 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/SimpleFeatures.h"
00017 
00018 namespace shogun
00019 {
00028 class CSigmoidKernel: public CSimpleKernel<float64_t>
00029 {
00030     public:
00037         CSigmoidKernel(int32_t size, float64_t gamma, float64_t coef0);
00038 
00047         CSigmoidKernel(CSimpleFeatures<float64_t>* l, CSimpleFeatures<float64_t>* r, int32_t size,
00048             float64_t gamma, float64_t coef0);
00049 
00050         virtual ~CSigmoidKernel();
00051 
00058         virtual bool init(CFeatures* l, CFeatures* r);
00059 
00061         virtual void cleanup();
00062 
00067         virtual EKernelType get_kernel_type() { return K_SIGMOID; }
00068 
00073         virtual const char* get_name() const { return "Sigmoid"; }
00074 
00075     protected:
00084         virtual float64_t compute(int32_t idx_a, int32_t idx_b);
00085 
00086     protected:
00088         float64_t gamma;
00090         float64_t coef0;
00091 };
00092 }
00093 #endif /* _SIGMOIDKERNEL_H__ */

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