protected virtual IEnumerable <IDeploymentChromosome> Mutate(IEnumerable <IDeploymentChromosome> offspring)
{
foreach (var child in offspring)
{
if (RandomProvider.GetRandom() <= MutationProbability)
{
yield return(MutationOperator.Mutate(child));
}
else
{
yield return(child);
}
}
}
private void CreateNextGeneration()
{
var startingIndex = UsingElitism ? NumberOfElite : 0;
if (UsingElitism)
{
Population.SortByFitness();
for (int i = 0; i < NumberOfElite; i++)
{
Population.AddChromosome(i, Population.Chromosomes[i]);
}
startingIndex = NumberOfElite;
}
var populationSize = Population.PopulationSize;
for (int i = startingIndex; i < populationSize; i++)
{
// TODO -> Should I make sure that both parents are different ??
// selection operation
var fatherChromosome = SelectionOperator.PopulationSelection(Population);
var motherChromosome = SelectionOperator.PopulationSelection(Population);
// TODO -> return more than one child always!!!
// crossover operation
var childChromosome = CrossoverOperator.Crossover(fatherChromosome, motherChromosome); // TODO -> some crossovers can return more than one child
// mutate operation
MutationOperator.Mutate(childChromosome);
// add child chromsome to the next generation population
CalculateFitness(childChromosome);
Population.AddChromosome(i, childChromosome);
}
// prepare for next evolution
Population.SetNextGeneration();
SelectionOperator.SetNextGeneration();
Generation++;
}