LocalityImprovedStringKernel.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) 1999-2008 Soeren Sonnenburg
00009  * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
00010  */
00011 
00012 #ifndef _LOCALITYIMPROVEDSTRINGKERNEL_H___
00013 #define _LOCALITYIMPROVEDSTRINGKERNEL_H___
00014 
00015 #include <shogun/lib/common.h>
00016 #include <shogun/kernel/StringKernel.h>
00017 
00018 namespace shogun
00019 {
00030 class CLocalityImprovedStringKernel: public CStringKernel<char>
00031 {
00032     public:
00034         CLocalityImprovedStringKernel();
00035 
00043         CLocalityImprovedStringKernel(int32_t size, int32_t length,
00044             int32_t inner_degree, int32_t outer_degree);
00045 
00054         CLocalityImprovedStringKernel(
00055             CStringFeatures<char>* l, CStringFeatures<char>* r,
00056             int32_t length, int32_t inner_degree, int32_t outer_degree);
00057 
00058         virtual ~CLocalityImprovedStringKernel();
00059 
00066         virtual bool init(CFeatures* l, CFeatures* r);
00067 
00072         virtual EKernelType get_kernel_type() { return K_LOCALITYIMPROVED; }
00073 
00078         virtual const char* get_name() const { return "LocalityImprovedStringKernel"; }
00079 
00080     protected:
00089         float64_t compute(int32_t idx_a, int32_t idx_b);
00090 
00091     private:
00092         void init();
00093 
00094     protected:
00096         int32_t length;
00098         int32_t inner_degree;
00100         int32_t outer_degree;
00101 };
00102 }
00103 #endif /* _LOCALITYIMPROVEDSTRINGKERNEL_H__ */
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