public double MutateWeight(GeneMutationType mutationType, double power)
{
double factor = (new Random().NextDouble() < 0.5 ? -1 : 1);
double weight = new Random().NextDouble() * power * factor;
if (mutationType == GeneMutationType.AdjustWeight)
{
Weight += weight;
}
else if (mutationType == GeneMutationType.ReplaceWeight)
{
Weight = weight;
}
return(weight);
}
public void MutateGeneWeights(GeneMutationType mutationType, double power, double rate)
{
int geneCount = 0;
double genomeTail = Genes.Count * 0.8;
bool severe = new Random().NextDouble() > GeneParameters.MutateGeneWeightSevereProbability;
double adjustmentProbability = 0;
double replacementProbability = 0;
Genes.ForEach(g =>
{
if (severe)
{
adjustmentProbability = GeneParameters.MutateGeneWeightSevereAdjustmentProbability;
replacementProbability = GeneParameters.MutateGeneWeightSevereReplacementProbability;
}
else if (Genes.Count >= GeneParameters.GeneCountThreshold && geneCount > genomeTail)
{
adjustmentProbability = GeneParameters.MutateGeneWeightAdjustmentProbability;
replacementProbability = GeneParameters.MutateGeneWeightReplacementProbability;
}
else
{
if (new Random().NextDouble() > 0.5)
{
adjustmentProbability = 1 - rate;
replacementProbability = 1 - rate - 0.1;
}
else
{
adjustmentProbability = 1 - rate;
replacementProbability = 1 - rate;
}
}
if (mutationType == GeneMutationType.AdjustWeight)
{
double choice = new Random().NextDouble();
if (choice > adjustmentProbability)
{
g.MutateWeight(mutationType, power);
}
else if (choice > replacementProbability)
{
g.MutateWeight(mutationType, power);
}
}
else if (mutationType == GeneMutationType.ReplaceWeight)
{
g.MutateWeight(mutationType, power);
}
if (g.Weight > GeneParameters.GeneWeightMaximum)
{
g.Weight = GeneParameters.GeneWeightMaximum;
}
else if (g.Weight < GeneParameters.GeneWeightMinimum)
{
g.Weight = GeneParameters.GeneWeightMinimum;
}
geneCount++;
});
}
