LinearStringKernel.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 _LINEARSTRINGKERNEL_H___
00012 #define _LINEARSTRINGKERNEL_H___
00013 
00014 #include "lib/common.h"
00015 #include "kernel/StringKernel.h"
00016 
00017 namespace shogun
00018 {
00029 class CLinearStringKernel: public CStringKernel<char>
00030 {
00031     public:
00034         CLinearStringKernel();
00035 
00041         CLinearStringKernel(CStringFeatures<char>* l, CStringFeatures<char>* r);
00042 
00043         virtual ~CLinearStringKernel();
00044 
00051         virtual bool init(CFeatures* l, CFeatures* r);
00052 
00054         virtual void cleanup();
00055 
00060         virtual EKernelType get_kernel_type()
00061         {
00062             return K_LINEAR;
00063         }
00064 
00069         virtual const char* get_name() const { return "Linear"; }
00070 
00079         virtual bool init_optimization(
00080             int32_t num_suppvec, int32_t* sv_idx, float64_t* alphas);
00081 
00086         virtual bool delete_optimization();
00087 
00093         virtual float64_t compute_optimized(int32_t idx);
00094 
00096         virtual void clear_normal();
00097 
00103         virtual void add_to_normal(int32_t idx, float64_t weight);
00104 
00105     protected:
00114         virtual float64_t compute(int32_t idx_a, int32_t idx_b);
00115 
00116     protected:
00118         float64_t* normal;
00119 };
00120 }
00121 #endif /* _LINEARSTRINGKERNEL_H___ */
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