private void CreateSpeciesOffspringSexual(
Species <T>[] speciesArr,
Species <T> species,
DiscreteDistribution speciesDistUpdated,
DiscreteDistribution?[] genomeDistArr,
DiscreteDistribution genomeDist,
int offspringCount,
List <NeatGenome <T> > offspringList,
double interspeciesMatingProportion,
IRandomSource rng,
out int offspringInterspeciesCount)
{
// Calc the number of offspring to create via inter-species sexual reproduction.
int offspringCountSexualInter;
if (interspeciesMatingProportion == 0.0)
{
offspringInterspeciesCount = offspringCountSexualInter = 0;
}
else
{
offspringInterspeciesCount = offspringCountSexualInter = (int)NumericsUtils.ProbabilisticRound(interspeciesMatingProportion * offspringCount, rng);
}
// Calc the number of offspring to create via intra-species sexual reproduction.
int offspringCountSexualIntra = offspringCount - offspringCountSexualInter;
// Get genome list for the current species.
var genomeList = species.GenomeList;
// Produce the required number of offspring from intra-species sexual reproduction.
for (int i = 0; i < offspringCountSexualIntra; i++)
{
// Select/sample parent A from the species.
int genomeIdx = DiscreteDistribution.Sample(rng, genomeDist);
var parentGenomeA = genomeList[genomeIdx];
// Create a new distribution with parent A removed from the set of possibilities.
DiscreteDistribution genomeDistUpdated = genomeDist.RemoveOutcome(genomeIdx);
// Select/sample parent B from the species.
genomeIdx = DiscreteDistribution.Sample(rng, genomeDistUpdated);
var parentGenomeB = genomeList[genomeIdx];
// Create a child genome and add it to offspringList.
var childGenome = _reproductionSexual.CreateGenome(parentGenomeA, parentGenomeB, rng);
offspringList.Add(childGenome);
}
// Produce the required number of offspring from inter-species sexual reproduction.
for (int i = 0; i < offspringCountSexualInter; i++)
{
// Select/sample parent A from the current species.
int genomeIdx = DiscreteDistribution.Sample(rng, genomeDist);
var parentGenomeA = genomeList[genomeIdx];
// Select another species to select parent B from.
int speciesIdx = DiscreteDistribution.Sample(rng, speciesDistUpdated);
Species <T> speciesB = speciesArr[speciesIdx];
// Select parent B from species B.
DiscreteDistribution genomeDistB = genomeDistArr[speciesIdx] !;
genomeIdx = DiscreteDistribution.Sample(rng, genomeDistB);
var parentGenomeB = speciesB.GenomeList[genomeIdx];
// Ensure parentA is the fittest of the two parents.
if (_fitnessComparer.Compare(parentGenomeA.FitnessInfo, parentGenomeB.FitnessInfo) < 0)
{
VariableUtils.Swap(ref parentGenomeA !, ref parentGenomeB !);
}
// Create a child genome and add it to offspringList.
var childGenome = _reproductionSexual.CreateGenome(parentGenomeA, parentGenomeB, rng);
offspringList.Add(childGenome);
}
}
