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 _SPARSEGAUSSIANKERNEL_H___ 00012 #define _SPARSEGAUSSIANKERNEL_H___ 00013 00014 #include "lib/common.h" 00015 #include "kernel/SparseKernel.h" 00016 #include "features/SparseFeatures.h" 00017 00018 namespace shogun 00019 { 00020 template <class T> class CSparseFeatures; 00032 class CSparseGaussianKernel: public CSparseKernel<float64_t> 00033 { 00034 public: 00040 CSparseGaussianKernel(int32_t size, float64_t width); 00041 00048 CSparseGaussianKernel( 00049 CSparseFeatures<float64_t>* l, CSparseFeatures<float64_t>* r, 00050 float64_t width); 00051 00052 virtual ~CSparseGaussianKernel(); 00053 00060 virtual bool init(CFeatures* l, CFeatures* r); 00061 00063 virtual void cleanup(); 00064 00069 virtual EKernelType get_kernel_type() { return K_SPARSEGAUSSIAN; } 00070 00075 inline virtual EFeatureType get_feature_type() { return F_DREAL; } 00076 00081 virtual const char* get_name() const { return "SparseGaussian"; } 00082 00083 protected: 00092 virtual float64_t compute(int32_t idx_a, int32_t idx_b); 00093 00094 protected: 00096 float64_t width; 00098 float64_t* sq_lhs; 00100 float64_t* sq_rhs; 00101 }; 00102 } 00103 #endif /* _SPARSEGAUSSIANKERNEL_H__ */