public void MutateEnableDisable(bool enable)
{
var candidates = new IntWeightDictionary();
for (int i = 0; i < weights.Count; i++)
{
var weight = weights.ElementAt(i).Value;
if (weight.enabled != enable)
{
candidates.Add(i, weight);
}
}
if (candidates.Count == 0)
{
return;
}
var chosen = candidates.ElementAt(Random.Range(0, candidates.Count)).Value;
chosen.enabled = enable;
}
public void MutateAddNeuron()
{
bool done = false;
while (!done)
{
int index = Random.Range(0, weights.Count);
var weight = weights.ElementAt(index).Value;
if (weight.enabled && !weight.recurrent && neurons[weight.neuronIn].type != Neuron.Type.BIAS)
{
done = true;
float oldValue = weight.value;
weight.enabled = false;
int from = weight.neuronIn;
int to = weight.neuronOut;
float newSplitX = (neurons[from].splitX + neurons[to].splitX) / 2f;
float newSplitY = (neurons[from].splitY + neurons[to].splitY) / 2f;
// check whether new neuron is already in innovation database
var oldNeuronInnovID = innovationDB.CheckNeuronInnovation(from, to);
// new innovation
if (oldNeuronInnovID == -1)
{
var neuronInnov = innovationDB.CreateInnovation(InnovationDB.Innovation.Type.NEW_NEURON, from, to, Neuron.Type.HIDDEN, newSplitX, newSplitY);
var newNeuron = new Neuron(neuronInnov.neuronID, Neuron.Type.HIDDEN, newSplitX, newSplitY);
neurons.Add(newNeuron.ID, newNeuron);
var weightInInnov = innovationDB.CreateInnovation(InnovationDB.Innovation.Type.NEW_WEIGHT, from, newNeuron.ID, Neuron.Type.NONE, -1, -1);
var weightIn = new Weight(weightInInnov.ID, from, newNeuron.ID, 1f, true, false);
weights.Add(weightInInnov.ID, weightIn);
var weightOutInnov = innovationDB.CreateInnovation(InnovationDB.Innovation.Type.NEW_WEIGHT, newNeuron.ID, to, Neuron.Type.NONE, -1, -1);
var weightOut = new Weight(weightOutInnov.ID, newNeuron.ID, to, oldValue, true, false);
weights.Add(weightOut.innovID, weightOut);
}
// innovation is already in innovation database
else
{
var newNeuronID = innovationDB.GetNeuronID(oldNeuronInnovID);
var oldWeightInID = innovationDB.CheckWeightInnovation(from, newNeuronID);
var oldWeightOutID = innovationDB.CheckWeightInnovation(newNeuronID, to);
if (oldWeightInID == -1 || oldWeightOutID == -1)
{
Debug.LogError("old innov ID " + oldNeuronInnovID);
Debug.LogError("Error in MutateAddNeuron: weights not in database, from " + from + ", to " + to + " newNeuronID " + newNeuronID);
return;
}
var newNeuron = new Neuron(newNeuronID, Neuron.Type.HIDDEN, newSplitX, newSplitY);
neurons.Add(newNeuron.ID, newNeuron);
var weightIn = new Weight(oldWeightInID, from, newNeuron.ID, 1f, true, false);
weights.Add(weightIn.innovID, weightIn);
var weightOut = new Weight(oldWeightOutID, newNeuron.ID, to, oldValue, true, false);
weights.Add(weightOut.innovID, weightOut);
}
}
}
}