public Phenotype[] ChooseBestByRoulete(int qty)
{
Phenotype[] result = new Phenotype[qty];
float totalFitness = 0;
foreach (Phenotype phenotype in phenotypes)
{
totalFitness += phenotype.fitness;
}
KeyValuePair<Phenotype, double>[] candiates = new KeyValuePair<Phenotype, double>[phenotypes.Count];
int i = 0;
foreach (Phenotype phenotype in phenotypes)
{
double p = (rouleteBiasToTheBest + rnd.NextDouble() * (1 - rouleteBiasToTheBest)) * phenotype.fitness / totalFitness;
candiates[i] = new KeyValuePair<Phenotype, double>(phenotype, p);
i++;
}
IOrderedEnumerable<KeyValuePair<Phenotype, double>> bestCandidates = candiates.OrderByDescending(
(KeyValuePair<Phenotype, double> candidate) => candidate.Value
);
int added = 0;
foreach (KeyValuePair<Phenotype, double> candidate in bestCandidates)
{
result[added++] = candidate.Key;
if (added >= qty) break;
}
return result;
}
public void AddPhenotype(float[][] genotype, float fitness)
{
Phenotype phenotype = new Phenotype() { genotype = genotype, fitness = fitness };
phenotypes.AddLast(phenotype);
if (bestPhenotype == null || bestPhenotype.fitness < phenotype.fitness) bestPhenotype = phenotype;
}
