SparseGaussianKernel.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 _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__ */
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