110 lines
3.1 KiB
C++
110 lines
3.1 KiB
C++
/*
|
|
|
|
(c) Thales group, 2010
|
|
|
|
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;
|
|
version 2 of the License.
|
|
|
|
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: http://eodev.sourceforge.net
|
|
|
|
Authors:
|
|
Lionel Parreaux <lionel.parreaux@gmail.com>
|
|
|
|
*/
|
|
|
|
#ifndef moFitnessMomentsStat_h
|
|
#define moFitnessMomentsStat_h
|
|
|
|
#include <utility>
|
|
#include <continuator/moStat.h>
|
|
|
|
/**
|
|
* Statistic that saves the standard deviation of the fitness of the solutions during the search
|
|
*/
|
|
template <class EOT>
|
|
//class moFitnessMomentsStat : public moStat<EOT, std::pair<typename EOT::Fitness,typename EOT::Fitness> >
|
|
class moFitnessMomentsStat : public moStat<EOT, std::pair<double, double> >
|
|
{
|
|
public :
|
|
typedef typename EOT::Fitness Fitness;
|
|
//typedef std::pair<typename EOT::Fitness,typename EOT::Fitness> Pair;
|
|
typedef std::pair<double, double> Pair;
|
|
using moStat<EOT, Pair >::value;
|
|
|
|
/**
|
|
* Default Constructor
|
|
* @param _reInitSol when true the best so far is reinitialized
|
|
*/
|
|
moFitnessMomentsStat(bool _reInitSol = true)
|
|
: moStat<EOT, Pair>(Pair(Fitness(), 0.0), "moments (average and stdev)"),
|
|
reInitSol(_reInitSol), firstTime(true),
|
|
nbSolutionsEncountered(0), currentAvg(0), currentVar(0)
|
|
{ }
|
|
|
|
/**
|
|
* Initialization of the best solution on the first one
|
|
* @param _sol the first solution
|
|
*/
|
|
virtual void init(EOT & _sol) {
|
|
if (reInitSol || firstTime)
|
|
{
|
|
value() = Pair(0.0,0.0);
|
|
nbSolutionsEncountered = currentAvg = currentVar = 0;
|
|
firstTime = false;
|
|
}
|
|
/*else if (firstTime)
|
|
{
|
|
value() = 0.0;
|
|
firstTime = false;
|
|
}*/
|
|
operator()(_sol);
|
|
}
|
|
|
|
/**
|
|
* Update the best solution
|
|
* @param _sol the current solution
|
|
*/
|
|
virtual void operator()(EOT & _sol) {
|
|
++nbSolutionsEncountered;
|
|
double x = _sol.fitness();
|
|
double oldAvg = currentAvg;
|
|
currentAvg = oldAvg + (x - oldAvg)/nbSolutionsEncountered;
|
|
if (nbSolutionsEncountered > 1) // <- not really necessary
|
|
{
|
|
//value() = (value()/nbSolutionsEncountered + _sol.fitness())/(nbSolutionsEncountered+1);
|
|
double oldVar = currentVar;
|
|
currentVar = oldVar + (x - oldAvg) * (x - currentAvg);
|
|
value() = Pair(currentAvg, currentVar/nbSolutionsEncountered);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @return name of the class
|
|
*/
|
|
virtual std::string className(void) const {
|
|
return "moFitnessVarianceStat";
|
|
}
|
|
|
|
protected:
|
|
bool reInitSol;
|
|
bool firstTime;
|
|
double
|
|
nbSolutionsEncountered
|
|
, currentAvg
|
|
, currentVar // actually the var * n
|
|
;
|
|
|
|
};
|
|
|
|
#endif // moFitnessMomentsStat_h
|