HistogramWordStringKernel.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 Soeren Sonnenburg
00008  * Written (W) 1999-2008 Gunnar Raetsch
00009  * Copyright (C) 1999-2008 Fraunhofer Institute FIRST and Max-Planck-Society
00010  */
00011 
00012 #ifndef _HISTOGRAMWORDKERNEL_H___
00013 #define _HISTOGRAMWORDKERNEL_H___
00014 
00015 #include "lib/common.h"
00016 #include "kernel/StringKernel.h"
00017 #include "classifier/PluginEstimate.h"
00018 #include "features/StringFeatures.h"
00019 
00021 class CHistogramWordStringKernel: public CStringKernel<uint16_t>
00022 {
00023     public:
00029         CHistogramWordStringKernel(int32_t size, CPluginEstimate* pie);
00030 
00037         CHistogramWordStringKernel(
00038             CStringFeatures<uint16_t>* l, CStringFeatures<uint16_t>* r,
00039             CPluginEstimate* pie);
00040 
00041         virtual ~CHistogramWordStringKernel();
00042 
00049         virtual bool init(CFeatures* l, CFeatures* r);
00050 
00052         virtual void cleanup();
00053 
00059         bool load_init(FILE* src);
00060 
00066         bool save_init(FILE* dest);
00067 
00072         virtual EKernelType get_kernel_type() { return K_HISTOGRAM; }
00073 
00078         virtual const char* get_name() { return "Histogram" ; }
00079 
00080     protected:
00089         float64_t compute(int32_t idx_a, int32_t idx_b);
00090 
00097         inline int32_t compute_index(int32_t position, uint16_t symbol)
00098         {
00099             return position*num_symbols+symbol+1;
00100         }
00101 
00102     protected:
00104         CPluginEstimate* estimate;
00105 
00107         float64_t* mean;
00109         float64_t* variance;
00110 
00112         float64_t* sqrtdiag_lhs;
00114         float64_t* sqrtdiag_rhs;
00115 
00117         float64_t* ld_mean_lhs;
00119         float64_t* ld_mean_rhs;
00120 
00122         float64_t* plo_lhs;
00124         float64_t* plo_rhs;
00125 
00127         int32_t num_params;
00129         int32_t num_params2;
00131         int32_t num_symbols;
00133         float64_t sum_m2_s2;
00134 
00136         bool initialized;
00137 };
00138 
00139 #endif /* _HISTOGRAMWORDKERNEL_H__ */

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