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SimpleLocalityImprovedStringKernel.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 Gunnar Raetsch
00008  * Written (W) 2013 Soeren Sonnenburg
00009  * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
00010  * Copyright (C) 2013 Soeren Sonnenburg
00011  */
00012 
00013 #ifndef _SIMPLELOCALITYIMPROVEDSTRINGKERNEL_H___
00014 #define _SIMPLELOCALITYIMPROVEDSTRINGKERNEL_H___
00015 
00016 #include <shogun/lib/common.h>
00017 #include <shogun/kernel/string/StringKernel.h>
00018 
00019 namespace shogun
00020 {
00032 class CSimpleLocalityImprovedStringKernel: public CStringKernel<char>
00033 {
00034     public:
00036         CSimpleLocalityImprovedStringKernel();
00037 
00045         CSimpleLocalityImprovedStringKernel(int32_t size, int32_t length,
00046             int32_t inner_degree, int32_t outer_degree);
00047 
00056         CSimpleLocalityImprovedStringKernel(
00057             CStringFeatures<char>* l, CStringFeatures<char>* r,
00058             int32_t length, int32_t inner_degree, int32_t outer_degree);
00059 
00060         virtual ~CSimpleLocalityImprovedStringKernel();
00061 
00068         virtual bool init(CFeatures *l, CFeatures *r);
00069 
00071         virtual void cleanup();
00072 
00077         virtual EKernelType get_kernel_type()
00078         {
00079             return K_SIMPLELOCALITYIMPROVED;
00080         }
00081 
00086         virtual const char* get_name() const
00087         {
00088             return "SimpleLocalityImprovedStringKernel";
00089         }
00090 
00091     private:
00103         float64_t dot_pyr (const char* const x1, const char* const x2,
00104                 const int32_t NOF_NTS, const int32_t NTWIDTH,
00105                 const int32_t DEGREE1, const int32_t DEGREE2, float64_t *pyra);
00106 
00107     protected:
00116         float64_t compute(int32_t idx_a, int32_t idx_b);
00117 
00118     private:
00119         void init();
00120 
00121     protected:
00123         int32_t length;
00125         int32_t inner_degree;
00127         int32_t outer_degree;
00128 
00130         SGVector<float64_t> pyramid_weights;
00131 };
00132 }
00133 #endif /* _SIMPLELOCALITYIMPROVEDSTRINGKERNEL_H___ */
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