RC

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

branches/rc2.0/moeo/src/distance/moeoNormalizedDistance.h

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+/*
+* <moeoNormalizedDistance.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 MOEONORMALIZEDDISTANCE_H_
+#define MOEONORMALIZEDDISTANCE_H_
+
+#include <vector>
+#include <utils/eoRealBounds.h>
+#include <distance/moeoDistance.h>
+
+/**
+ * The base class for double distance computation with normalized objective values (i.e. between 0 and 1).
+ */
+template < class MOEOT , class Type = double >
+class moeoNormalizedDistance : public moeoDistance < MOEOT , Type >
+  {
+  public:
+
+    /** the objective vector type of the solutions */
+    typedef typename MOEOT::ObjectiveVector ObjectiveVector;
+
+
+    /**
+     * Default ctr
+     */
+    moeoNormalizedDistance()
+    {
+      bounds.resize(ObjectiveVector::Traits::nObjectives());
+      // initialize bounds in case someone does not want to use them
+      for (unsigned int i=0; i<ObjectiveVector::Traits::nObjectives(); i++)
+        {
+          bounds[i] = eoRealInterval(0,1);
+        }
+    }
+
+
+    /**
+     * Returns a very small value that can be used to avoid extreme cases (where the min bound == the max bound)
+     */
+    static double tiny()
+    {
+      return 1e-6;
+    }
+
+
+    /**
+     * Sets the lower and the upper bounds for every objective using extremes values for solutions contained in the population _pop
+     * @param _pop the population
+     */
+    virtual void setup(const eoPop < MOEOT > & _pop)
+    {
+      double min, max;
+      for (unsigned int i=0; i<ObjectiveVector::Traits::nObjectives(); i++)
+        {
+          min = _pop[0].objectiveVector()[i];
+          max = _pop[0].objectiveVector()[i];
+          for (unsigned int j=1; j<_pop.size(); j++)
+            {
+              min = std::min(min, _pop[j].objectiveVector()[i]);
+              max = std::max(max, _pop[j].objectiveVector()[i]);
+            }
+          // setting of the bounds for the objective i
+          setup(min, max, i);
+        }
+    }
+
+
+    /**
+     * Sets the lower bound (_min) and the upper bound (_max) for the objective _obj
+     * @param _min lower bound
+     * @param _max upper bound
+     * @param _obj the objective index
+     */
+    virtual void setup(double _min, double _max, unsigned int _obj)
+    {
+      if (_min == _max)
+        {
+          _min -= tiny();
+          _max += tiny();
+        }
+      bounds[_obj] = eoRealInterval(_min, _max);
+    }
+
+
+    /**
+     * Sets the lower bound and the upper bound for the objective _obj using a eoRealInterval object
+     * @param _realInterval the eoRealInterval object
+     * @param _obj the objective index
+     */
+    virtual void setup(eoRealInterval _realInterval, unsigned int _obj)
+    {
+      bounds[_obj] = _realInterval;
+    }
+
+
+  protected:
+
+    /** the bounds for every objective (bounds[i] = bounds for the objective i) */
+    std::vector < eoRealInterval > bounds;
+
+  };
+
+#endif /*MOEONORMALIZEDDISTANCE_H_*/