// =============== CROSSOVER ================
public Genome Crossover(Genome partner)
{
Genome child = new Genome(Inputs, Outputs);
child.Connections.Clear();
child.Nodes.Clear();
child.Layers = Layers;
child.NextNode = NextNode;
child.BiasNode = BiasNode;
List <ConnectionGene> childConnections = new List <ConnectionGene>();
List <bool> isEnabled = new List <bool>();
//CONNECTIONS
foreach (ConnectionGene connection in Connections)
{
bool setEnabled = true;
int partnerConnection = GetMatchingGene(partner, connection.InnovationNumber);
if (partnerConnection != -1) //if the other parent has the same gene
{
//If one of the connections is disabled, there is 75% chance that the gene will be disabled
if ((!connection.IsEnabled || !partner.Connections[partnerConnection].IsEnabled) && randomGenerator.NextDouble() < 0.75)
{
setEnabled = false;
}
//The gene is transmitted by one of the parents
if (randomGenerator.NextDouble() < 0.5)
{
childConnections.Add(connection);
}
else
{
childConnections.Add(partner.Connections[partnerConnection]);
}
}
else //disjoint or excess gene -> add it
{
childConnections.Add(connection);
setEnabled = connection.IsEnabled;
}
isEnabled.Add(setEnabled);
}
//the child has as many nodes as the fittest parent (this one)
foreach (Node node in Nodes)
{
child.Nodes.Add(node.Clone());
}
//clone all connections
for (int i = 0; i < childConnections.Count; i++)
{
child.Connections.Add(childConnections[i].Clone(child.GetNode(childConnections[i].FromNode.Number), child.GetNode(childConnections[i].ToNode.Number)));
child.Connections[i].IsEnabled = isEnabled[i];
}
child.ConnectNodes();
return(child);
}
// ============== USEFUL METHODS =================
public Genome ToGenome()
{
Genome clone = new Genome(Inputs, Outputs);
clone.Nodes.Clear();
clone.Connections.Clear();
foreach (Node n in Nodes)
{
clone.Nodes.Add(n.Clone());
}
foreach (ConnectionGene c in Connections)
{
clone.Connections.Add(c.Clone(clone.GetNode(c.FromNode.Number), clone.GetNode(c.ToNode.Number)));
}
clone.Layers = Layers;
clone.NextNode = NextNode;
clone.BiasNode = BiasNode;
clone.ConnectNodes();
clone.networkChanged = true;
return(clone);
}
