HammingWordDistance.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) 2007-2009 Christian Gehl
00008  * Written (W) 1999-2009 Soeren Sonnenburg
00009  * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
00010  */
00011 
00012 #ifndef _HAMMINGWORDDISTANCE_H___
00013 #define _HAMMINGWORDDISTANCE_H___
00014 
00015 #include "lib/common.h"
00016 #include "features/Features.h"
00017 #include "features/StringFeatures.h"
00018 #include "distance/StringDistance.h"
00019 
00020 namespace shogun
00021 {
00022     template <class T> class CStringFeatures;
00023 
00025 class CHammingWordDistance: public CStringDistance<uint16_t>
00026 {
00027     public:
00032         CHammingWordDistance(bool use_sign);
00033 
00040         CHammingWordDistance(CStringFeatures<uint16_t>* l, CStringFeatures<uint16_t>* r, bool use_sign);
00041         virtual ~CHammingWordDistance();
00042 
00049         virtual bool init(CFeatures* l, CFeatures* r);
00050 
00052         virtual void cleanup();
00053 
00058         virtual EDistanceType get_distance_type() { return D_HAMMINGWORD; }
00059 
00064         virtual const char* get_name() const { return "HammingWord"; }
00065 
00071         void get_dictionary(int32_t& dsize, float64_t*& dweights)
00072         {
00073             dsize=dictionary_size;
00074             dweights = dictionary_weights;
00075         }
00076 
00077     protected:
00081         float64_t compute(int32_t idx_a, int32_t idx_b);
00082 
00083     protected:
00085         int32_t dictionary_size;
00087         float64_t* dictionary_weights;
00089         bool use_sign;
00090 };
00091 } // namespace shogun
00092 #endif /* _HAMMINGWORDDISTANCE_H___ */
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