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Migration from SVN

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quemy 2012-08-30 11:30:11 +02:00
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branches/rc2.0/eo/src/eoSteadyFitContinue.h
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// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
//-----------------------------------------------------------------------------
// eoSteadyFitContinue.h
// (c) GeNeura Team, 1999, Marc Schoenauer, 2000
/*
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
*/
//-----------------------------------------------------------------------------
#ifndef _eoSteadyFitContinue_h
#define _eoSteadyFitContinue_h
#include <eoContinue.h>
#include <utils/eoLogger.h>
/**
A continuator: does a minimum number of generations, then
stops whenever a given number of generations takes place without improvement
@ingroup Continuators
*/
template< class EOT>
class eoSteadyFitContinue: public eoContinue<EOT>
{
public:
typedef typename EOT::Fitness Fitness;
/// Ctor for setting a
eoSteadyFitContinue( unsigned long _minGens, unsigned long _steadyGens)
: repMinGenerations( _minGens ), repSteadyGenerations( _steadyGens),
steadyState(false), thisGenerationPlaceHolder(0),
thisGeneration(thisGenerationPlaceHolder){};
/// Ctor for enabling the save/load the no. of generations counted
eoSteadyFitContinue( unsigned long _minGens, unsigned long _steadyGen,
unsigned long& _currentGen)
: repMinGenerations( _minGens ), repSteadyGenerations( _steadyGen),
steadyState(_currentGen>_minGens), thisGenerationPlaceHolder(0),
thisGeneration(_currentGen){};
/** Returns false when a certain number of generations is
* reached withtout improvement */
virtual bool operator() ( const eoPop<EOT>& _vEO ) {
thisGeneration++;
Fitness bestCurrentFitness = _vEO.nth_element_fitness(0);
if (steadyState) { // already after MinGenenerations
if (bestCurrentFitness > bestSoFar) {
bestSoFar = bestCurrentFitness;
lastImprovement = thisGeneration;
} else {
if (thisGeneration - lastImprovement > repSteadyGenerations) {
eo::log << eo::progress << "STOP in eoSteadyFitContinue: Done " << repSteadyGenerations
<< " generations without improvement\n";
return false;
}
}
} else { // not yet in steady state
if (thisGeneration > repMinGenerations) { // go to steady state
steadyState = true;
bestSoFar = bestCurrentFitness;
lastImprovement = thisGeneration;
eo::log << eo::progress << "eoSteadyFitContinue: Done the minimum number of generations\n";
}
}
return true;
}
/** Sets the parameters (minimum nb of gen. + steady nb of gen.)
and sets the current generation to 0 (the begin)
@todo replace thi by an init method ?
*/
virtual void totalGenerations( unsigned long _mg, unsigned long _sg ) {
repMinGenerations = _mg;
repSteadyGenerations = _sg;
reset();
};
/// Resets the state after it's been reached
virtual void reset () {
steadyState=false;
thisGeneration = 0;
}
/** accessors*/
virtual unsigned long minGenerations( )
{ return repMinGenerations; };
virtual unsigned long steadyGenerations( )
{ return repSteadyGenerations; };
virtual std::string className(void) const { return "eoSteadyFitContinue"; }
private:
unsigned long repMinGenerations;
unsigned long repSteadyGenerations;
bool steadyState;
unsigned long thisGenerationPlaceHolder;
unsigned long& thisGeneration;
unsigned int lastImprovement;
Fitness bestSoFar;
};
#endif