Adding replacement strategies: teh ReduceMergeReduce for EASEA and the

MGG and G2 replacements from Deb's PCX paper

eo/src/eoG3Replacement.h

@@ -0,0 +1,86 @@
+/** -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
+
+   -----------------------------------------------------------------------------
+   eoG3Replacement.h 
+   (c) Maarten Keijzer, Marc Schoenauer, 2002
+ 
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser 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: Marc.Schoenauer@inria.fr
+             mkeijzer@dhi.dk
+ */
+//-----------------------------------------------------------------------------
+
+#ifndef _eoG3Replacement_h
+#define _eoG3Replacement_h
+
+
+//-----------------------------------------------------------------------------
+#include <eoPop.h>
+#include <eoFunctor.h>
+#include <eoMerge.h>
+#include <eoReduce.h>
+#include <utils/eoHowMany.h>
+#include <eoReduceSplit.h>
+//-----------------------------------------------------------------------------
+
+/**
+eoG3Replacement is an eoReplacement:
+- no strong elitism (is suppposed to be within a steady-state engine)
+- choose N (2) parents RANDOMLY - remove them from the parent population
+- merge offspring and the N removed parents
+- select best N of this merged population
+- put them back into parent population
+
+*/
+
+template <class EOT>
+class eoG3Replacement : public eoReplacement<EOT>
+{
+public:
+  eoG3Replacement(eoHowMany _howManyEliminatedParents = eoHowMany(2, false)) :
+    // split truncates the parents and returns eliminated parents
+    split(_howManyEliminatedParents, true), 
+    // reduce truncates the offpsring and does not return eliminated guys
+    reduce(-_howManyEliminatedParents, false) 
+  {}
+    
+    void operator()(eoPop<EOT> & _parents, eoPop<EOT> & _offspring)
+    {
+      eoPop<EOT> temp;
+      split(_parents, temp);
+      unsigned toKeep = temp.size(); // how many to keep from merged populations
+      // merge temp into offspring
+      plus(temp, _offspring);	   // add temp to _offspring (a little inconsistent!)
+      
+      // reduce merged
+      reduce(_offspring, temp);	   // temp dummy arg. will not be modified
+      // minimla check:
+      if (_offspring.size() != toKeep)
+	{
+	  cerr << "Les tailles " << _offspring.size() << " " << toKeep << endl;
+	throw runtime_error("eoG3Replacement: wrong number of remaining offspring");
+	}
+      // and put back into _parents
+      plus(_offspring, _parents);      
+    }
+
+private:
+  eoLinearTruncateSplit<EOT> split; // few parents to truncate -> linear 
+  eoTruncateSplit<EOT> reduce;	   // supposedly many offspring to truncate
+  eoPlus<EOT> plus;
+};
+
+#endif