relax.h

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//
//    FreeLing - Open Source Language Analyzers
//
//    Copyright (C) 2014   TALP Research Center
//                         Universitat Politecnica de Catalunya
//
//    This library is free software; you can redistribute it and/or
//    modify it under the terms of the GNU Affero General Public
//    License as published by the Free Software Foundation; either
//    version 3 of the License, or (at your option) any later version.
//
//    This library is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//    Affero General Public License for more details.
//
//    You should have received a copy of the GNU Affero General Public
//    License along with this library; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
//    contact: Lluis Padro (padro@lsi.upc.es)
//             TALP Research Center
//             despatx C6.212 - Campus Nord UPC
//             08034 Barcelona.  SPAIN
//

#ifndef _RELAX
#define _RELAX

#include <list>
#include <vector>

namespace freeling {



  class constraint : public std::vector<std::vector<double*> > {
  private:
    double compatibility;

  public:
    constraint(int);

    void set_compatibility(double);
    double get_compatibility() const;
  };


  class label {
    friend class problem;
    friend class relax;

  protected:
    double weight[2];
    std::list<constraint> constraints;

  public:
    label();
    double get_weight(int) const;
    void set_weight(int, double);

  };


  class problem {
    friend class relax;
  protected:
    std::vector<std::vector<label> > vars;
    int CURRENT, NEXT;

  public:
    problem(int);

    void add_label(int, double);
    void add_constraint (int, int, const std::list<std::list<std::pair<int,int> > > &, double);
    std::list<int> best_label(int) const;
    bool there_are_changes(double) const;
    void next_iteration();
  };




  class relax {
  private:
    int MaxIter;
    double ScaleFactor;
    double Epsilon;

    double NormalizeSupport(double) const;

  public:
    relax(int, double, double);

    void solve(problem &) const;
    void set_scale_factor(double);
  };

} // namespace

#endif