eoesglobalxover.h

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/** -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-

//-----------------------------------------------------------------------------
// eoEsGlobalXover.h : ES global crossover
// (c) Marc Schoenauer 2001

    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: [e-mail] http://eeaax.cmap.polytchnique.fr/
 */
//-----------------------------------------------------------------------------


#ifndef _eoEsGlobalXover_H
#define _eoEsGlobalXover_H

#include <utils/eoRNG.h>

#include <es/eoEsSimple.h>
#include <es/eoEsStdev.h>
#include <es/eoEsFull.h>

#include <eoGenOp.h>
// needs a selector - here random
#include <eoRandomSelect.h>

/** Gloabl crossover operator for ES genotypes.
  *  Uses some Atom crossovers to handle both the object variables
  *  and the mutation strategy parameters
  */
template<class EOT>
class eoEsGlobalXover: public eoGenOp<EOT>
{
public:
  typedef typename EOT::Fitness FitT;

  /**
   * (Default) Constructor.
   */
  eoEsGlobalXover(eoBinOp<double> & _crossObj, eoBinOp<double> & _crossMut) :
    crossObj(_crossObj), crossMut(_crossMut) {}

  /// The class name. Used to display statistics
  virtual std::string className() const { return "eoEsGlobalXover"; }

  /// The TOTAL number of offspring (here = nb of parents modified in place)
  unsigned max_production(void) { return 1; }

  /**
   * modifies one parents in the populator
   *     using 2 new parents for each component!
   *
   * @param _pop a POPULATOR (not a simple population)
   */
  void apply(eoPopulator<EOT>& _plop)
  {
    // First, select as many parents as you will have offspring
    EOT& parent = *_plop; // select the first parent

    // first, the object variables
    for (unsigned i=0; i<parent.size(); i++)
      {
	// get extra parents - use private selector
	// _plop.source() is the eoPop<EOT> used by _plop to get parents
	const EOT& realParent1 = sel(_plop.source());
	const EOT& realParent2 = sel(_plop.source());
	parent[i] = realParent1[i];
	crossObj(parent[i], realParent2[i]); // apply eoBinOp
      }
    // then the self-adaptation parameters
    cross_self_adapt(parent, _plop.source());
    // dont' forget to invalidate
    parent.invalidate();
  }

private:

  /** Method for cross self-adaptation parameters

  Specialization for eoEsSimple.
  */
  void cross_self_adapt(eoEsSimple<FitT> & _parent, const eoPop<eoEsSimple<FitT> >& _pop)
  {
    const EOT& realParent1 = sel(_pop);
    const EOT& realParent2 = sel(_pop);
    _parent.stdev = realParent1.stdev;
    crossMut(_parent.stdev, realParent2.stdev); // apply eoBinOp
  }

  /** Method for cross self-adaptation parameters

  Specialization for eoEsStdev.
  */
  void cross_self_adapt(eoEsStdev<FitT> & _parent, const eoPop<eoEsStdev<FitT> >& _pop)
  {
    for (unsigned i=0; i<_parent.size(); i++)
      {
	const EOT& realParent1 = sel(_pop);
	const EOT& realParent2 = sel(_pop);
	_parent.stdevs[i] = realParent1.stdevs[i];
	crossMut(_parent.stdevs[i], realParent2.stdevs[i]); // apply eoBinOp
      }
  }

  /** Method for cross self-adaptation parameters

  Specialization for eoEsFull.
  */
  void cross_self_adapt(eoEsFull<FitT> & _parent, const eoPop<eoEsFull<FitT> >& _pop)
  {
    unsigned i;
    // the StDev
    for (i=0; i<_parent.size(); i++)
      {
	const EOT& realParent1 = sel(_pop);
	const EOT& realParent2 = sel(_pop);
	_parent.stdevs[i] = realParent1.stdevs[i];
	crossMut(_parent.stdevs[i], realParent2.stdevs[i]); // apply eoBinOp
      }
    // the roataion angles
    for (i=0; i<_parent.correlations.size(); i++)
      {
	const EOT& realParent1 = sel(_pop);
	const EOT& realParent2 = sel(_pop);
	_parent.correlations[i] = realParent1.correlations[i];
	crossMut(_parent.correlations[i], realParent2.correlations[i]); // apply eoBinOp
      }

  }

  // the data
  eoRandomSelect<EOT> sel;
  eoBinOp<double> & crossObj;
  eoBinOp<double> & crossMut;
};

#endif