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) 1999-2010 Soeren Sonnenburg 00008 * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society 00009 * Copyright (C) 2010 Berlin Institute of Technology 00010 */ 00011 00012 #ifndef _GAUSSIANKERNEL_H___ 00013 #define _GAUSSIANKERNEL_H___ 00014 00015 #include "lib/common.h" 00016 #include "kernel/DotKernel.h" 00017 #include "features/DotFeatures.h" 00018 00019 namespace shogun 00020 { 00021 class CDotFeatures; 00033 class CGaussianKernel: public CDotKernel 00034 { 00035 public: 00039 CGaussianKernel(); 00040 00046 CGaussianKernel(int32_t size, float64_t width); 00047 00055 CGaussianKernel(CDotFeatures* l, CDotFeatures* r, 00056 float64_t width, int32_t size=10); 00057 00058 virtual ~CGaussianKernel(); 00059 00066 virtual bool init(CFeatures* l, CFeatures* r); 00067 00069 virtual void cleanup(); 00070 00075 virtual EKernelType get_kernel_type() { return K_GAUSSIAN; } 00076 00081 inline virtual const char* get_name() const { return "GaussianKernel"; } 00082 00087 inline virtual float64_t get_width(void) const { 00088 return 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(void) throw (ShogunException); 00111 00112 private: 00119 void precompute_squared(); 00120 00127 void precompute_squared_helper(float64_t* &buf, CDotFeatures* df); 00128 00129 void init(); 00130 00131 protected: 00133 float64_t width; 00135 float64_t* sq_lhs; 00137 float64_t* sq_rhs; 00138 }; 00139 } 00140 #endif /* _GAUSSIANKERNEL_H__ */