SHOGUN
v3.2.0
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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) 1999-2010 Soeren Sonnenburg 00008 * Written (W) 2011 Abhinav Maurya 00009 * Written (W) 2012 Heiko Strathmann 00010 * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society 00011 * Copyright (C) 2010 Berlin Institute of Technology 00012 */ 00013 00014 #ifndef _GAUSSIANKERNEL_H___ 00015 #define _GAUSSIANKERNEL_H___ 00016 00017 #include <shogun/lib/common.h> 00018 #include <shogun/kernel/Kernel.h> 00019 #include <shogun/kernel/DotKernel.h> 00020 #include <shogun/features/DotFeatures.h> 00021 00022 namespace shogun 00023 { 00024 class CDotFeatures; 00046 class CGaussianKernel: public CDotKernel 00047 { 00048 public: 00050 CGaussianKernel(); 00051 00057 CGaussianKernel(int32_t size, float64_t width); 00058 00066 CGaussianKernel(CDotFeatures* l, CDotFeatures* r, 00067 float64_t width, int32_t size=10); 00068 00069 virtual ~CGaussianKernel(); 00070 00075 static CGaussianKernel* obtain_from_generic(CKernel* kernel); 00076 00078 virtual CSGObject* shallow_copy() const; 00079 00086 virtual bool init(CFeatures* l, CFeatures* r); 00087 00089 virtual void cleanup(); 00090 00095 virtual EKernelType get_kernel_type() { return K_GAUSSIAN; } 00096 00101 virtual const char* get_name() const { return "GaussianKernel"; } 00102 00107 virtual void set_width(float64_t w) { width=w; } 00108 00113 virtual float64_t get_width() const { return width; } 00114 00119 inline void set_compact_enabled(bool compact) { m_compact=compact; } 00120 00125 inline bool get_compact_enabled() { return m_compact; } 00126 00134 virtual SGMatrix<float64_t> get_parameter_gradient( 00135 const TParameter* param, index_t index=-1); 00136 00137 protected: 00146 virtual float64_t compute(int32_t idx_a, int32_t idx_b); 00147 00154 virtual void load_serializable_post() throw (ShogunException); 00155 00156 private: 00160 void precompute_squared(); 00161 00168 void precompute_squared_helper(float64_t* &buf, CDotFeatures* df); 00169 00170 void init(); 00171 00172 protected: 00174 float64_t width; 00176 float64_t* sq_lhs; 00178 float64_t* sq_rhs; 00180 bool m_compact; 00181 }; 00182 } 00183 #endif /* _GAUSSIANKERNEL_H__ */