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 
00027 class CSparseLinearKernel: public CSparseKernel<float64_t>
00028 {
00029     public:
00032         CSparseLinearKernel();
00033 
00039         CSparseLinearKernel(
00040             CSparseFeatures<float64_t>* l, CSparseFeatures<float64_t>* r);
00041 
00042         virtual ~CSparseLinearKernel();
00043 
00050         virtual bool init(CFeatures* l, CFeatures* r);
00051 
00053         virtual void cleanup();
00054 
00060         virtual bool load_init(FILE* src);
00061 
00067         virtual bool save_init(FILE* dest);
00068 
00073         virtual EKernelType get_kernel_type() { return K_SPARSELINEAR; }
00074 
00079         virtual const char* get_name() const { return "SparseLinear"; }
00080 
00089         virtual bool init_optimization(int32_t num_suppvec, int32_t* sv_idx,
00090             float64_t* alphas);
00091 
00096         virtual bool delete_optimization();
00097 
00103         virtual float64_t compute_optimized(int32_t idx);
00104 
00106         virtual void clear_normal();
00107 
00113         virtual void add_to_normal(int32_t idx, float64_t weight);
00114 
00120         inline const float64_t* get_normal(int32_t& len)
00121         {
00122             len=normal_length;
00123             return normal;
00124         }
00125 
00126     protected:
00135         virtual float64_t compute(int32_t idx_a, int32_t idx_b);
00136 
00137     protected:
00139         float64_t* normal;
00141         int32_t normal_length;
00142 };
00143 
00144 #endif /* _SPARSELINEARKERNEL_H__ */

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