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hmm_tagger.h

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00001 
00002 //
00003 //    FreeLing - Open Source Language Analyzers
00004 //
00005 //    Copyright (C) 2004   TALP Research Center
00006 //                         Universitat Politecnica de Catalunya
00007 //
00008 //    This library is free software; you can redistribute it and/or
00009 //    modify it under the terms of the GNU Lesser General Public
00010 //    License as published by the Free Software Foundation; either
00011 //    version 2.1 of the License, or (at your option) any later version.
00012 //
00013 //    This library is distributed in the hope that it will be useful,
00014 //    but WITHOUT ANY WARRANTY; without even the implied warranty of
00015 //    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016 //    Lesser General Public License for more details.
00017 //
00018 //    You should have received a copy of the GNU Lesser General Public
00019 //    License along with this library; if not, write to the Free Software
00020 //    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
00021 //
00022 //    contact: Lluis Padro (padro@lsi.upc.es)
00023 //             TALP Research Center
00024 //             despatx C6.212 - Campus Nord UPC
00025 //             08034 Barcelona.  SPAIN
00026 //
00028 
00029 #ifndef _TAGGER
00030 #define _TAGGER
00031 
00032 #include <map>
00033 #include <list>
00034 #include <set>
00035 
00036 #include "language.h"
00037 #include "tagger.h"
00038 
00039 using namespace std;
00040 
00051 
00052 class viterbi {  
00053   public:
00055     viterbi(int);
00057     ~viterbi();
00058   
00060     map <string, double> *delta_log;
00062     map <string, string> *phi;
00063 };
00064 
00065 
00073 
00074 class emission_states: public set<string> {};
00075 
00076 
00083 
00084 class hmm_tagger: public POS_tagger {
00085    private:
00086       // Configuration options
00087       string Language;
00088 
00090       map <string, double> PTag;
00091       map <string, double> PBg;
00092       map <string, double> PTrg;
00093       map <string, double> PInitial;
00094       map <string, double> PWord;
00095 
00097       double c[3];
00098 
00099       double ProbA_log(const string &, const string &) const;
00100       double ProbB_log(const string &, const word &) const;
00101       double ProbPi_log(const string &) const;
00102 
00104       list<emission_states> FindStates(const sentence &) const;
00105 
00106    public:
00108        hmm_tagger(const string &, const string &, bool);
00109 
00111        void analyze(list<sentence> &);
00113        list<sentence> analyze(const list<sentence> &);
00114 };
00115 
00116 #endif
00117 

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