public List <IntChromosome> Selection(List <IntChromosome> chromosomes, FitnessFuncGoal goal)
{
List <IntChromosome> bestChromosomes = new List <IntChromosome>();
while (bestChromosomes.Count < chromosomes.Count)
{
chromosomeIndexes.AsParallel().ForAll(val => val = random.Next(chromosomes.Count));
bestChromosomes.Add(FindBest(chromosomes, goal));
}
return(bestChromosomes);
}
private IntChromosome FindBest(List <IntChromosome> chromosomes, FitnessFuncGoal goal)
{
IntChromosome bestChromosome = null;
foreach (int index in chromosomeIndexes)
{
if (bestChromosome == null || comparator.Compare(bestChromosome, chromosomes.ElementAt(index)) > 0)
{
bestChromosome = chromosomes.ElementAt(index);
}
}
return(bestChromosome);
}
public TournamentSelection(int populationSize, int tournamentSize, FitnessFuncGoal goal)
{
if (tournamentSize >= 2 && tournamentSize < populationSize)
{
chromosomeIndexes = new List <int>(tournamentSize);
comparator = initComparator(goal);
}
else
{
throw new ArgumentException
("Tournament size must be between 2 and population size minus 1.");
}
}
public IComparer <IntChromosome> initComparator(FitnessFuncGoal goal)
{
switch (goal)
{
case FitnessFuncGoal.Min:
return(new MinComparator());
case FitnessFuncGoal.Max:
return(new MaxComparator());
default:
throw new Exception("Fitness function type must be initialized!");
}
}
public SphericalFunction(FitnessFuncGoal goal)
{
this.goal = goal;
}
