DistantSegmentsKernel.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) 2011 Heiko Strathmann
00008  * DS-Kernel implementation Written (W) 2008 S├ębastien Boisvert under GPLv3
00009  * Copyright (C) 2011 Berlin Institute of Technology and Max-Planck-Society
00010  */
00011 
00012 #ifndef DISTANTSEGMENTSKERNEL_H_
00013 #define DISTANTSEGMENTSKERNEL_H_
00014 
00015 #include <shogun/kernel/StringKernel.h>
00016 
00017 namespace shogun
00018 {
00019 
00034 class CDistantSegmentsKernel: public CStringKernel<char>
00035 {
00036 public:
00038     CDistantSegmentsKernel(void);
00039 
00046     CDistantSegmentsKernel(int32_t size, int32_t delta, int32_t theta);
00047 
00056     CDistantSegmentsKernel(CStringFeatures<char>* l, CStringFeatures<char>* r,
00057             int32_t size, int32_t delta, int32_t theta);
00058 
00065     virtual bool init(CFeatures* l, CFeatures* r);
00066 
00070     virtual EKernelType get_kernel_type()
00071     {
00072         return K_DISTANTSEGMENTS;
00073     }
00074 
00078     virtual const char* get_name() const
00079     {
00080         return "DistantSegmentsKernel";
00081     }
00082 
00083 protected:
00093     virtual float64_t compute(int32_t idx_a, int32_t idx_b);
00094 
00095 private:
00097     void init();
00098 
00103     int32_t bin(int32_t j, int32_t i);
00104 
00118     int32_t compute(char* s, int32_t sLength, char* b, int32_t bLength,
00119             int32_t delta_m, int32_t theta_m);
00120 
00121 protected:
00123     int32_t m_delta;
00124 
00126     int32_t m_theta;
00127 
00128 
00129 };
00130 
00131 }
00132 
00133 #endif /* DISTANTSEGMENTSKERNEL_H_ */
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