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) 1999-2008 Soeren Sonnenburg
00008  * Copyright (C) 1999-2008 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 
00023 class CSparseLinearKernel: public CSparseKernel<DREAL>
00024 {
00025     public:
00031         CSparseLinearKernel(INT size, DREAL scale=1.0);
00032 
00040         CSparseLinearKernel(
00041             CSparseFeatures<DREAL>* l, CSparseFeatures<DREAL>* r,
00042             DREAL scale=1.0, INT size=10);
00043 
00044         virtual ~CSparseLinearKernel();
00045 
00052         virtual bool init(CFeatures* l, CFeatures* r);
00053 
00055         virtual void cleanup();
00056 
00062         virtual bool load_init(FILE* src);
00063 
00069         virtual bool save_init(FILE* dest);
00070 
00075         virtual EKernelType get_kernel_type() { return K_SPARSELINEAR; }
00076 
00081         virtual const CHAR* get_name() { return "SparseLinear" ; } ;
00082 
00091         virtual bool init_optimization(INT num_suppvec, INT* sv_idx,
00092             DREAL* alphas);
00093 
00098         virtual bool delete_optimization();
00099 
00105         virtual DREAL compute_optimized(INT idx);
00106 
00108         virtual void clear_normal();
00109 
00115         virtual void add_to_normal(INT idx, DREAL weight);
00116 
00122         inline const double* get_normal(INT& len)
00123         {
00124             len=normal_length;
00125             return normal;
00126         }
00127 
00128     protected:
00137         virtual DREAL compute(INT idx_a, INT idx_b);
00138 
00140         virtual void init_rescale();
00141 
00142     protected:
00144         double scale;
00146         bool initialized;
00147 
00149         DREAL* normal;
00151         INT normal_length;
00152 };
00153 
00154 #endif /* _SPARSELINEARKERNEL_H__ */

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