public INode MutateAddNode()
{
int innovation = (int)RandomHelpers.GetRandomBiasingLow(
Genes.Min(g => g.Innovation), Genes.Max(g => g.Innovation)
);
IGene oldGene = Genes.FirstOrDefault(g => g.Innovation <= innovation);
if (oldGene == null)
{
oldGene = Genes[new Random().Next(Genes.Count)];
}
INode newNode = new Node(NodeType.Hidden);
// Disable the old connection
oldGene.IsExpressed = false;
// Add new connections
IGene newGeneIn = new Gene(
oldGene.NodeOut,
newNode,
GetNextInnovation(),
1
);
IGene newGeneOut = new Gene(
newNode,
oldGene.NodeIn,
GetNextInnovation(),
oldGene.Weight
);
Nodes.Add(newNode);
Genes.Add(newGeneIn);
Genes.Add(newGeneOut);
return(newNode);
}