Migration from SVN

moeo/src/selection/moeoStochTournamentSelect.h

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+/*
+* <moeoStochTournamentSelect.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 MOEOSTOCHTOURNAMENTSELECT_H_
+#define MOEOSTOCHTOURNAMENTSELECT_H_
+
+#include <comparator/moeoComparator.h>
+#include <comparator/moeoFitnessThenDiversityComparator.h>
+#include <selection/moeoSelectOne.h>
+#include <selection/moeoSelectors.h>
+
+/**
+ *  Selection strategy that selects ONE individual by stochastic tournament.
+ */
+template < class MOEOT > class moeoStochTournamentSelect:public moeoSelectOne <MOEOT>
+  {
+  public:
+
+    /**
+     * Full Ctor
+     * @param _comparator the comparator (used to compare 2 individuals)
+     * @param _tRate the tournament rate
+     */
+    moeoStochTournamentSelect (moeoComparator < MOEOT > & _comparator, double _tRate = 1.0) : comparator (_comparator), tRate (_tRate)
+    {
+      // consistency checks
+      if (tRate < 0.5)
+        {
+          std::cerr << "Warning, Tournament rate should be > 0.5\nAdjusted to 0.55\n";
+          tRate = 0.55;
+        }
+      if (tRate > 1)
+        {
+          std::cerr << "Warning, Tournament rate should be < 1\nAdjusted to 1\n";
+          tRate = 1;
+        }
+    }
+
+
+    /**
+     * Ctor without comparator. A moeoFitnessThenDiversityComparator is used as default.
+     * @param _tRate the tournament rate
+     */
+    moeoStochTournamentSelect (double _tRate = 1.0) : comparator (defaultComparator), tRate (_tRate)
+    {
+      // consistency checks
+      if (tRate < 0.5)
+        {
+          std::cerr << "Warning, Tournament rate should be > 0.5\nAdjusted to 0.55\n";
+          tRate = 0.55;
+        }
+      if (tRate > 1)
+        {
+          std::cerr << "Warning, Tournament rate should be < 1\nAdjusted to 1\n";
+          tRate = 1;
+        }
+    }
+
+
+    /**
+     *  Apply the tournament to the given population
+     * @param _pop the population
+     */
+    const MOEOT & operator() (const eoPop < MOEOT > &_pop)
+    {
+      // use the selector
+      return mo_stochastic_tournament(_pop,tRate,comparator);
+    }
+
+
+  protected:
+
+    /** the comparator (used to compare 2 individuals) */
+    moeoComparator < MOEOT > & comparator;
+    /** a fitness then diversity comparator can be used as default */
+    moeoFitnessThenDiversityComparator < MOEOT > defaultComparator;
+    /** the tournament rate */
+    double tRate;
+
+  };
+
+#endif /*MOEOSTOCHTOURNAMENTSELECT_H_ */