public Chromosome MutateAddNode(
Func <int, int> chooseEdgeGeneTypeIndex,
NodeGene newNodeGene
) =>
Change((e, n) => {
var enabledEdges = EdgeGenes.Where(edge => edge.Value.IsEnabled).Select(edge => edge.Key).ToImmutableList();
if (enabledEdges.Count == 0)
{
return;
}
var edgeGeneType = enabledEdges.ElementAt(chooseEdgeGeneTypeIndex(enabledEdges.Count));
var edgeGene = EdgeGenes[edgeGeneType];
e[edgeGeneType] = edgeGene.Disable();
var newNodeGeneType = new NodeGeneType(NodeGeneType.InnovationIdByParents(edgeGeneType.From, edgeGeneType.To, newNodeGene));
n[newNodeGeneType] = newNodeGene;
e[new EdgeGeneType(edgeGeneType.From, newNodeGeneType)] = new EdgeGene(1, true);
e[new EdgeGeneType(newNodeGeneType, edgeGeneType.To)] = new EdgeGene(edgeGene.Weight, true);
});
private static void TestCPPN()
{
var n1 = new NodeGeneType(NodeGeneType.RandomInnovationId());
var n2 = new NodeGeneType(NodeGeneType.RandomInnovationId());
var n3 = new NodeGeneType(NodeGeneType.RandomInnovationId());
var n4 = new NodeGeneType(NodeGeneType.RandomInnovationId());
var chromosome = Chromosome.Build((e, n) => {
n.Add(n1, new NodeGene(FunctionType.Identity, AggregationType.Sum, NodeType.Input));
n.Add(n2, new NodeGene(FunctionType.Identity, AggregationType.Sum, NodeType.Input));
n.Add(n3, new NodeGene(FunctionType.Sin, AggregationType.Sum, NodeType.Inner));
n.Add(n4, new NodeGene(FunctionType.Identity, AggregationType.Sum, NodeType.Output));
e.Add(new EdgeGeneType(n1, n3), new EdgeGene(1, true));
e.Add(new EdgeGeneType(n2, n3), new EdgeGene(1, true));
e.Add(new EdgeGeneType(n1, n4), new EdgeGene(1, true));
e.Add(new EdgeGeneType(n3, n4), new EdgeGene(1, true));
});
var a = chromosome
.MutateAddNode(n => n / 2, new NodeGene(FunctionType.Log, AggregationType.Sum, NodeType.Inner))
.MutateAddNode(n => n / 3, new NodeGene(FunctionType.Log, AggregationType.Sum, NodeType.Inner))
.MutateChangeEnabled(n => n / 4)
.MutateChangeWeight(n => n / 3, 1);
var b = chromosome
.MutateAddNode(n => n / 2, new NodeGene(FunctionType.Exponent, AggregationType.Sum, NodeType.Inner))
.MutateAddNode(n => n / 2, new NodeGene(FunctionType.Heaviside, AggregationType.Sum, NodeType.Inner));
var c = Chromosome.Crossover(a, b,
(na, nb) => new NodeGene(na.FunctionType, na.AggregationType, na.NodeType),
(ea, eb) => new EdgeGene((ea.Weight + eb.Weight) / 2, true)
);
var cppn = new CPPN(a, ImmutableArray.Create(n1, n2), ImmutableArray.Create(n4));
Console.WriteLine(cppn.Calculate(ImmutableArray.Create(1.0, 1.0))[0]);
// n4 = n3 + n1
// n3 = Sin(n1 + n2)
//
}
public static string InnovationIdByParents(NodeGeneType a, NodeGeneType b, NodeGene nodeGene) => Hash(a.InnovationId + b.InnovationId + nodeGene.GetHashCode());
public EdgeGeneType(NodeGeneType from, NodeGeneType to)
{
From = from;
To = to;
}
