RC

git-svn-id: svn://scm.gforge.inria.fr/svnroot/paradiseo@2710 331e1502-861f-0410-8da2-ba01fb791d7f

branches/rc2.0/moeo/src/diversity/moeoFrontByFrontSharingDiversityAssignment.h

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+/*
+* <moeoFrontByFrontSharingDiversityAssignment.h>
+* Copyright (C) DOLPHIN Project-Team, INRIA Futurs, 2006-2007
+* (C) OPAC Team, LIFL, 2002-2007
+*
+* Arnaud Liefooghe
+*
+* This software is governed by the CeCILL license under French law and
+* abiding by the rules of distribution of free software.  You can  use,
+* modify and/ or redistribute the software under the terms of the CeCILL
+* license as circulated by CEA, CNRS and INRIA at the following URL
+* "http://www.cecill.info".
+*
+* As a counterpart to the access to the source code and  rights to copy,
+* modify and redistribute granted by the license, users are provided only
+* with a limited warranty  and the software's author,  the holder of the
+* economic rights,  and the successive licensors  have only  limited liability.
+*
+* In this respect, the user's attention is drawn to the risks associated
+* with loading,  using,  modifying and/or developing or reproducing the
+* software by the user in light of its specific status of free software,
+* that may mean  that it is complicated to manipulate,  and  that  also
+* therefore means  that it is reserved for developers  and  experienced
+* professionals having in-depth computer knowledge. Users are therefore
+* encouraged to load and test the software's suitability as regards their
+* requirements in conditions enabling the security of their systems and/or
+* data to be ensured and,  more generally, to use and operate it in the
+* same conditions as regards security.
+* The fact that you are presently reading this means that you have had
+* knowledge of the CeCILL license and that you accept its terms.
+*
+* ParadisEO WebSite : http://paradiseo.gforge.inria.fr
+* Contact: paradiseo-help@lists.gforge.inria.fr
+*
+*/
+//-----------------------------------------------------------------------------
+
+#ifndef MOEOFRONTBYFRONTSHARINGDIVERSITYASSIGNMENT_H_
+#define MOEOFRONTBYFRONTSHARINGDIVERSITYASSIGNMENT_H_
+
+#include <diversity/moeoSharingDiversityAssignment.h>
+
+/**
+ * Sharing assignment scheme on the way it is used in NSGA.
+ */
+template < class MOEOT >
+class moeoFrontByFrontSharingDiversityAssignment : public moeoSharingDiversityAssignment < MOEOT >
+  {
+  public:
+
+    /** the objective vector type of the solutions */
+    typedef typename MOEOT::ObjectiveVector ObjectiveVector;
+
+
+    /**
+     * Ctor
+     * @param _distance the distance used to compute the neighborhood of solutions (can be related to the decision space or the objective space)
+     * @param _nicheSize neighborhood size in terms of radius distance (closely related to the way the distances are computed)
+     * @param _alpha parameter used to regulate the shape of the sharing function
+     */
+    moeoFrontByFrontSharingDiversityAssignment(moeoDistance<MOEOT,double> & _distance, double _nicheSize = 0.5, double _alpha = 2.0) : moeoSharingDiversityAssignment < MOEOT >(_distance, _nicheSize, _alpha)
+    {}
+
+
+    /**
+     * Ctor with an euclidean distance (with normalized objective values) in the objective space is used as default
+     * @param _nicheSize neighborhood size in terms of radius distance (closely related to the way the distances are computed)
+     * @param _alpha parameter used to regulate the shape of the sharing function
+     */
+    moeoFrontByFrontSharingDiversityAssignment(double _nicheSize = 0.5, double _alpha = 2.0) : moeoSharingDiversityAssignment < MOEOT >(_nicheSize, _alpha)
+    {}
+
+
+    /**
+     * @warning NOT IMPLEMENTED, DO NOTHING !
+     * Updates the diversity values of the whole population _pop by taking the deletion of the objective vector _objVec into account.
+     * @param _pop the population
+     * @param _objVec the objective vector
+     * @warning NOT IMPLEMENTED, DO NOTHING !
+     */
+    void updateByDeleting(eoPop < MOEOT > & _pop, ObjectiveVector & _objVec)
+    {
+      std::cout << "WARNING : updateByDeleting not implemented in moeoSharingDiversityAssignment" << std::endl;
+    }
+
+
+  private:
+
+    using moeoSharingDiversityAssignment < MOEOT >::distance;
+    using moeoSharingDiversityAssignment < MOEOT >::nicheSize;
+    using moeoSharingDiversityAssignment < MOEOT >::sh;
+
+
+    /**
+     * Sets similarities FRONT BY FRONT for every solution contained in the population _pop
+     * @param _pop the population
+     */
+    void setSimilarities(eoPop < MOEOT > & _pop)
+    {
+      // compute distances between every individuals
+      moeoDistanceMatrix < MOEOT , double > dMatrix (_pop.size(), distance);
+      dMatrix(_pop);
+      // sets the distance to bigger than the niche size for every couple of solutions that do not belong to the same front
+      for (unsigned int i=0; i<_pop.size(); i++)
+        {
+          for (unsigned int j=0; j<i; j++)
+            {
+              if (_pop[i].fitness() != _pop[j].fitness())
+                {
+                  dMatrix[i][j] = nicheSize;
+                  dMatrix[j][i] = nicheSize;
+                }
+            }
+        }
+      // compute similarities
+      double sum;
+      for (unsigned int i=0; i<_pop.size(); i++)
+        {
+          sum = 0.0;
+          for (unsigned int j=0; j<_pop.size(); j++)
+            {
+              sum += sh(dMatrix[i][j]);
+            }
+          _pop[i].diversity(sum);
+        }
+    }
+
+  };
+
+#endif /*MOEOFRONTBYFRONTSHARINGDIVERSITYASSIGNMENT_H_*/