public void addNodeMutation(Random random)
{
// pick a random index
int splitGeneIndex = innovationNumbers[random.Next(innovationNumbers.Count)];
ConnectionGene c = connections[splitGeneIndex];
c.setEnabled(false);
NodeGene n1 = nodes[c.getIn()];
NodeGene n2 = nodes[c.getOut()];
// new node
NodeGene n3 = new NodeGene(NodeGene.NodeType.HIDDEN, nodes.Count);
// add connection genes (1) leading into the new node gets a weight of 1 (2) leading out of new node gets the same weight as old connection
InnovationUtility.incrementGlobalInnovation();
addConnectionGene(new ConnectionGene(n1.getNodeNumber(), n3.getNodeNumber(), 1f, true, InnovationUtility.getGlobalInnovation()));
InnovationUtility.incrementGlobalInnovation();
addConnectionGene(new ConnectionGene(n3.getNodeNumber(), n2.getNodeNumber(), c.getWeight(), true, InnovationUtility.getGlobalInnovation()));
connections [splitGeneIndex] = c;
// add node gene
addNodeGene(n3);
}
// ensures n1 and n2 are different
public NodeGene getDifferentNode(Random random, NodeGene n1, Dictionary <int, NodeGene> nodes)
{
NodeGene n2 = nodes[nodeNumbers[random.Next(nodeNumbers.Count)]];
while (n2.getNodeNumber() == n1.getNodeNumber())
{
n2 = nodes[nodeNumbers[random.Next(nodeNumbers.Count)]];
}
return(n2);
}
public void addNodeGene(NodeGene node)
{
nodes.Add(node.getNodeNumber(), node);
addNodeNumber(node.getNodeNumber());
}
public bool addConnectionMutation(Random random)
{
bool uniqueMatch = false;
NodeGene n1 = null;
NodeGene n2 = null;
if (allConnectionsMade())
{
return(false);
}
// to be used in circular loop checker
Utility.nodeConnections.Clear();
foreach (KeyValuePair <int, ConnectionGene> c in connections)
{
//if key already exists add to hashset
if (Utility.nodeConnections.ContainsKey(c.Value.getOut()))
{
Utility.nodeConnections[c.Value.getOut()].Add(c.Value.getIn());
}
else
{
Utility.nodeConnections.Add(c.Value.getOut(), new HashSet <int>()
{
c.Value.getIn()
});
}
}
while (!uniqueMatch)
{
uniqueMatch = true;
n1 = nodes[nodeNumbers[random.Next(nodeNumbers.Count)]];
n2 = getDifferentNode(random, n1, nodes);
if (circularConnectionFound(n1.getNodeNumber(), n2.getNodeNumber()))
{
return(false);
}
// if n1 and n1 aren't INPUT nodes
if (!(n1.getNodeType() == NodeGene.NodeType.INPUT && n2.getNodeType() == NodeGene.NodeType.INPUT))
{
makeN1PointToN2(ref n1, ref n2);
foreach (KeyValuePair <int, ConnectionGene> c in connections)
{
// checks to see if connection already exists
if (c.Value.getIn() == n1.getNodeNumber() && c.Value.getOut() == n2.getNodeNumber())
{
uniqueMatch = false;
}
}
}
else
{
uniqueMatch = false;
}
}
InnovationUtility.incrementGlobalInnovation();
addConnectionGene(new ConnectionGene(n1.getNodeNumber(), n2.getNodeNumber(), getRandomFloatBetweenPoints(random, -1.0, 1.0), true, InnovationUtility.getGlobalInnovation()));
return(true);
}