relax.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 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 //    General Public License for more details.
00017 //
00018 //    You should have received a copy of the GNU 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 _RELAX
00030 #define _RELAX
00031 
00032 #include <list>
00033 #include <vector>
00034 
00035 // just declaring to break ciclic references
00036 class constraint;
00037 
00049 
00050 class problem : std::vector<std::list<double> > {
00051   friend class relax;
00052   public:
00054     problem(int);
00056     void add_label(int, double);
00057 };
00058 
00059 
00066 
00067 class label {
00068   friend class relax;
00069   protected:
00071     double weight[2];
00073     std::list<constraint> constraints;
00074 
00075   public:
00077     label();
00078 
00079 };
00080 
00087 
00088 class constraint : public std::vector<std::vector<double*> > {
00089   private:
00090     double compatibility;
00091 
00092   public:
00094     constraint();
00095 
00097     void set_compatibility(double);
00098     double get_compatibility() const;
00099 };
00100 
00107 
00108 class relax {
00109    private:
00111      std::vector<std::vector<label> > vars;
00113      int CURRENT, NEXT;
00115      int MaxIter;
00117      double ScaleFactor;
00119      double Epsilon;
00120 
00122      double NormalizeSupport(double) const;
00123      bool there_are_changes() const;
00124 
00125    public:
00127        relax(int, double, double);
00128 
00130        void reset(const problem &);
00132        void add_constraint (int, int, const std::list<std::list<std::pair<int,int> > > &, double);
00134        void solve();
00136        std::list<int> best_label(int) const;
00137 };
00138 
00139 
00140 #endif
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