From 5bdfaf0eaa23265ca59aebd5e64fba2d966c885a Mon Sep 17 00:00:00 2001
From: evomarc <evomarc>
Date: Mon, 17 Jun 2002 09:12:08 +0000
Subject: [PATCH] Separated eoSequentialSelect from eoRandomSelect.h file Added
 eoEliteSequentialSelect, where best is always selected first, useful for G3
 engine

---
 eo/src/eoSequentialSelect.h | 143 ++++++++++++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 eo/src/eoSequentialSelect.h

diff --git a/eo/src/eoSequentialSelect.h b/eo/src/eoSequentialSelect.h
new file mode 100644
index 00000000..523928a1
--- /dev/null
+++ b/eo/src/eoSequentialSelect.h
@@ -0,0 +1,143 @@
+// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
+
+//-----------------------------------------------------------------------------
+// eoSequential.h
+// (c) GeNeura Team, 1998 - Maarten Keijzer 2000, 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: todos@geneura.ugr.es, http://geneura.ugr.es
+             Marc.Schoenauer@polytechnique.fr
+             mak@dhi.dk
+ */
+//-----------------------------------------------------------------------------
+
+#ifndef eoSequential_h
+#define eoSequential_h
+
+/** Contains the following classes:
+ *  - eoSequentialSelect, returns all individuals one by one, 
+ *    either sorted or shuffled
+ *  - eoEliteSequentialSelect, returns all indivisuals one by one
+ *    starting with best, continuing shuffled (see G3 engine)
+ */
+
+#include <utils/eoRNG.h>
+#include <eoSelectOne.h>
+
+//-----------------------------------------------------------------------------
+/** eoSequentialSelect: returns all individual in order
+ *       looping back to the beginning when exhasuted
+ * can be from best to worse, or in random order
+ *
+ * It is the eoSelectOne equivalent of eoDetSelect -
+ *    though eoDetSelect always returns individuals from best to worst
+ */
+//-----------------------------------------------------------------------------
+
+template <class EOT> class eoSequentialSelect: public eoSelectOne<EOT>
+{
+ public:
+  /** Ctor: sets the current pter to MAXINT so init will take place first time
+      not very elegant, maybe ...
+  */
+  eoSequentialSelect(bool _ordered = true):
+    ordered(_ordered), current(MAXINT) {}
+
+  void setup(const eoPop<EOT>& _pop)
+  {
+    eoPters.resize(_pop.size());
+    if (ordered)    // probably we could have a marker to avoid re-sorting
+	    _pop.sort(eoPters);
+    else
+      _pop.shuffle(eoPters);
+    current=0;
+  }
+
+  virtual const EOT& operator()(const eoPop<EOT>& _pop)
+  {
+    if (current >= _pop.size())
+      setup(_pop);
+
+    unsigned eoN = current;
+    current++;
+    return *eoPters[eoN] ;
+  }
+private:
+  bool ordered;
+  unsigned current;
+  vector<const EOT*> eoPters;
+};
+
+
+//-----------------------------------------------------------------------------
+/** eoEliteSequentialSelect: returns the best individual first,
+ *              then the others in sequence (random order).
+ *              for G3 evolution engine, see Deb, Anad and Joshi, CEC 2002
+ *
+ * As eoSequentialSelect, it is an eoSelectOne to be used within the eoEaseyEA
+ * algo, but conceptually it should be a global eoSelect, as
+ * it selects a bunch of guys in one go (done in the setup function now)
+ */
+
+template <class EOT> class eoEliteSequentialSelect: public eoSelectOne<EOT>
+{
+ public:
+
+  /** Ctor: sets the current pter to MAXINT so init will take place first time
+      not very elegant, maybe ...
+  */
+  eoEliteSequentialSelect(): current(MAXINT) {}
+
+  void setup(const eoPop<EOT>& _pop)
+  {
+    eoPters.resize(_pop.size());
+    _pop.shuffle(eoPters);
+    // now get the best
+    unsigned int ibest = 0;
+    const EOT * best = eoPters[0];
+    if (_pop.size() == 1)
+      throw runtime_error("Trying eoEliteSequentialSelect with only one individual!");
+    for (unsigned i=1; i<_pop.size(); i++)
+      if (*eoPters[i]>*best)
+	{
+	  ibest = i;
+	  best = eoPters[ibest];
+	}
+    // and put it upfront
+    const EOT *ptmp = eoPters[0];
+    eoPters[0]=best;
+    eoPters[ibest] = ptmp;
+    // exit after setting current 
+    current=0;
+  }
+
+  virtual const EOT& operator()(const eoPop<EOT>& _pop)
+  {
+    if (current >= _pop.size())
+      setup(_pop);
+
+    unsigned eoN = current;
+    current++;
+    return *eoPters[eoN] ;
+  }
+private:
+  unsigned current;
+  vector<const EOT*> eoPters;
+};
+
+
+#endif
+