SparseLinearKernel.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 _SPARSELINEARKERNEL_H___
00012 #define _SPARSELINEARKERNEL_H___
00013 
00014 #include "lib/common.h"
00015 #include "kernel/SparseKernel.h"
00016 #include "features/SparseFeatures.h"
00017 
00018 namespace shogun
00019 {
00029 class CSparseLinearKernel: public CSparseKernel<float64_t>
00030 {
00031     public:
00034         CSparseLinearKernel();
00035 
00041         CSparseLinearKernel(
00042             CSparseFeatures<float64_t>* l, CSparseFeatures<float64_t>* r);
00043 
00044         virtual ~CSparseLinearKernel();
00045 
00052         virtual bool init(CFeatures* l, CFeatures* r);
00053 
00055         virtual void cleanup();
00056 
00061         virtual EKernelType get_kernel_type() { return K_SPARSELINEAR; }
00062 
00067         virtual const char* get_name() const { return "SparseLinear"; }
00068 
00077         virtual bool init_optimization(int32_t num_suppvec, int32_t* sv_idx,
00078             float64_t* alphas);
00079 
00084         virtual bool delete_optimization();
00085 
00091         virtual float64_t compute_optimized(int32_t idx);
00092 
00094         virtual void clear_normal();
00095 
00101         virtual void add_to_normal(int32_t idx, float64_t weight);
00102 
00108         inline const float64_t* get_normal(int32_t& len)
00109         {
00110             len=normal_length;
00111             return normal;
00112         }
00113 
00114     protected:
00123         virtual float64_t compute(int32_t idx_a, int32_t idx_b);
00124 
00125     protected:
00127         float64_t* normal;
00129         int32_t normal_length;
00130 };
00131 }
00132 #endif /* _SPARSELINEARKERNEL_H__ */
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