public void MutateNode(Genome genome)
{
NodeGene newNode;
List <ConnectionGene> candidateConnections = genome.Connections.Values.ToList();
int randomIndex = rand.Next(0, candidateConnections.Count);
ConnectionGene connectionToSplit = candidateConnections[randomIndex];
RecordIndex index = new RecordIndex(connectionToSplit.Input.Innovation, connectionToSplit.Output.Innovation);
NodeGene wasSplitBy = this.archive.GetRecord(index).wasSplitBy;
if (wasSplitBy != null)
{
newNode = new NodeGene(wasSplitBy);
}
else
{
newNode = new NodeGene(InnovationGenerator.ID, Constants.NodeType.HIDDEN);
}
ConnectionGene connection1 = new ConnectionGene(InnovationGenerator.ID, connectionToSplit.Input, newNode, connectionToSplit.Weight);
ConnectionGene connection2 = new ConnectionGene(InnovationGenerator.ID, newNode, connectionToSplit.Output);
//genome.Connections.Remove(connectionToSplit.Innovation);
genome.Connections[connectionToSplit.Innovation].Enabled = false;
genome.Add(newNode);
genome.Add(connection1, connection2);
this.archive.CreateRecord(genome.Connections[connectionToSplit.Innovation], newNode);
this.archive.CreateRecord(connection1);
this.archive.CreateRecord(connection2);
}
} //consider removing the gene from the genome entirely when this is set to false
#endregion
#region Constructors
public ConnectionGene(int innovation, NodeGene input, NodeGene output, double weight = 1, bool enabled = true)
{
this.Innovation = innovation;
this.Input = input;
this.Output = output;
this.Weight = weight;
this.Enabled = enabled;
}
private List <NodeGene> GenerateNodes(int count, Constants.NodeType type)
{
List <NodeGene> nodes = new List <NodeGene>();
for (int i = 0; i < count; i++)
{
NodeGene node = new NodeGene(InnovationGenerator.ID, type);
nodes.Add(node);
}
return(nodes);
}
public NodeGene(NodeGene node)
{
this.Innovation = node.Innovation;
this.Type = node.Type;
this.Value = node.Value;
}
public ArchiveRecord(ConnectionGene connection, NodeGene node)
{
this.connection = connection;
this.wasSplitBy = node;
}