public void MutateAddNode(Population pop)
{
var choice = Config.globalRandom.Next(0, Connections.Count);
var existingConnection = Connections[choice];
if (existingConnection.InputNode == 9999)
{
return;
}
//check if existingConnection has been split before
int newNodeID;
if (pop.AddedConnections.Keys.Contains(existingConnection.GetID()))
{
newNodeID = pop.AddedConnections[existingConnection.GetID()];
}
else
{
newNodeID = Config.newNodeCounter++;
pop.AddedConnections[existingConnection.GetID()] = newNodeID;
}
var choices = new List <string>()
{
"sin", "rescale", "square"
};
var pick = choices[Config.globalRandom.Next(0, choices.Count)];
var newNode = new NodeGene(newNodeID, "hidden", pick);
//exit if this innovation has been created before
if (Nodes.Contains(newNode))
{
return;
}
var existingBiasConnection = Connections.Single(x => x.InputNode == 9999 & x.OutputNode == existingConnection.OutputNode);
//new connection in has weight 1
var newConnectionIn = new ConnectionGene(existingConnection.InputNode, newNode._id, 1.0);
//new connection out has weight equal to old connection
var newConnectionOut = new ConnectionGene(newNode._id, existingConnection.OutputNode, existingConnection.Weight);
//should improve this, using 9999 to signify bias is kinda ugly
var newConnectionBias = new ConnectionGene(9999, newNode._id, 1.0);
Nodes.Add(newNode);
Connections.Add(newConnectionIn);
Connections.Add(newConnectionOut);
Connections.Add(newConnectionBias);
Connections.Remove(existingConnection);
CalculateInputs();
}
//copy constructor
public NodeGene(NodeGene parent)
{
_id = parent._id;
_type = parent._type;
_inputs = new List <int>();
foreach (int i in parent._inputs)
{
_inputs.Add(i);
}
Activation = parent.Activation;
}
