/// <summary>
/// Mutates the weights of a neural net. For each connection in the genotype there is a random chance of different mutations occuring according to the properties defined on this class.
/// </summary>
/// <param name="genotype">Genotype to mutate.</param>
/// <param name="random">Random for number generation.</param>
/// <param name="innovationIdManager"></param>
public override void Mutate(NeatBrainGenotype genotype, Random random, InnovationIdManager innovationIdManager)
{
foreach (ConnectionGene gene in genotype.ConnectionGenes)
{
if (random.NextDouble() < this.ProbPerturbWeight)
{
// Perturb the weights
gene.Weight += (float)random.Normal(0.0d, NewWeightStd) * WeightPerturbScale;
}
if (random.NextDouble() < this.ProbResetWeight)
{
// Reset the weight to a new random value
gene.Weight = (float)random.Normal(0.0d, NewWeightStd) * NewWeightPower;
}
if (random.NextDouble() < this.ProbEnableConn)
{
if (!genotype.CreatesCycle(gene))
{
gene.Enabled = true;
}
}
if (random.NextDouble() < this.ProbDisableConn)
{
gene.Enabled = false;
}
}
}
/// <summary> /// Mutates a given genotype /// </summary> /// <param name="genotype">Genotype to mutate</param> public abstract void Mutate(NeatBrainGenotype genotype, Random random, InnovationIdManager innovationIdManager);