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  * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
00009  */
00010 
00011 #ifndef _SIMPLELOCALITYIMPROVEDSTRINGKERNEL_H___
00012 #define _SIMPLELOCALITYIMPROVEDSTRINGKERNEL_H___
00013 
00014 #include "lib/common.h"
00015 #include "kernel/StringKernel.h"
00016 
00017 namespace shogun
00018 {
00030 class CSimpleLocalityImprovedStringKernel: public CStringKernel<char>
00031 {
00032     public:
00040         CSimpleLocalityImprovedStringKernel(int32_t size, int32_t length,
00041             int32_t inner_degree, int32_t outer_degree);
00042 
00051         CSimpleLocalityImprovedStringKernel(
00052             CStringFeatures<char>* l, CStringFeatures<char>* r,
00053             int32_t length, int32_t inner_degree, int32_t outer_degree);
00054 
00055         virtual ~CSimpleLocalityImprovedStringKernel();
00056 
00063         virtual bool init(CFeatures *l, CFeatures *r);
00064 
00066         virtual void cleanup();
00067 
00072         virtual EKernelType get_kernel_type()
00073         {
00074             return K_SIMPLELOCALITYIMPROVED;
00075         }
00076 
00081         virtual const char* get_name() const { return "SimpleLocalityImproved"; }
00082 
00083     private:
00095         float64_t dot_pyr (const char* const x1, const char* const x2,
00096                 const int32_t NOF_NTS, const int32_t NTWIDTH,
00097                 const int32_t DEGREE1, const int32_t DEGREE2, float64_t *pyra);
00098 
00099     protected:
00108         float64_t compute(int32_t idx_a, int32_t idx_b);
00109 
00110     protected:
00112         int32_t length;
00114         int32_t inner_degree;
00116         int32_t outer_degree;
00118         float64_t *pyramid_weights;
00119 };
00120 }
00121 #endif /* _SIMPLELOCALITYIMPROVEDSTRINGKERNEL_H___ */
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