ExponentialKernel.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  * Gaussian Kernel used as template, attribution:
00008  * Written (W) 1999-2010 Soeren Sonnenburg
00009  * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
00010  * Copyright (C) 2010 Berlin Institute of Technology
00011  *
00012  * Slightly edited by Justin Patera 2011
00013  */
00014 
00015 #ifndef _EXPONENTIALKERNEL_H___
00016 #define _EXPONENTIALKERNEL_H___
00017 
00018 #include <shogun/lib/common.h>
00019 #include <shogun/kernel/DotKernel.h>
00020 #include <shogun/features/DotFeatures.h>
00021 #include <shogun/distance/Distance.h>
00022 
00023 namespace shogun
00024 {
00025     class CDotFeatures;
00037 class CExponentialKernel: public CDotKernel
00038 {
00039     public:
00043         CExponentialKernel();
00044 
00053         CExponentialKernel(CDotFeatures* l, CDotFeatures* r,
00054             float64_t width, CDistance* distance, int32_t size);
00055 
00057         virtual ~CExponentialKernel();
00058 
00065         virtual bool init(CFeatures* l, CFeatures* r);
00066 
00068         virtual void cleanup();
00069 
00074         virtual EKernelType get_kernel_type() { return K_EXPONENTIAL; }
00075 
00080         virtual const char* get_name() const { return "ExponentialKernel"; }
00081 
00086         virtual float64_t get_width() const
00087         {
00088             return m_width;
00089         }
00090 
00091     protected:
00100         virtual float64_t compute(int32_t idx_a, int32_t idx_b);
00101 
00110         virtual void load_serializable_post() throw (ShogunException);
00111 
00112     private:
00113         void init();
00114 
00115     protected:
00117         CDistance* m_distance;
00119         float64_t m_width;
00120 };
00121 }
00122 #endif /* _EXPONENTIALKERNEL_H__ */
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