/// <summary>
/// Construct a genome, do not provide links and neurons.
/// </summary>
///
/// <param name="id">The genome id.</param>
/// <param name="inputCount_0">The input count.</param>
/// <param name="outputCount_1">The output count.</param>
public NEATGenome(long id, int inputCount_0, int outputCount_1)
{
GenomeID = id;
AdjustedScore = 0;
inputCount = inputCount_0;
outputCount = outputCount_1;
AmountToSpawn = 0;
speciesID = 0;
double inputRowSlice = 0.8d / (inputCount_0);
neuronsChromosome = new Chromosome();
linksChromosome = new Chromosome();
Chromosomes.Add(neuronsChromosome);
Chromosomes.Add(linksChromosome);
for (int i = 0; i < inputCount_0; i++)
{
neuronsChromosome.Add(new NEATNeuronGene(NEATNeuronType.Input,
i, 0, 0.1d + i * inputRowSlice));
}
neuronsChromosome.Add(new NEATNeuronGene(NEATNeuronType.Bias,
inputCount_0, 0, 0.9d));
double outputRowSlice = 1 / (double)(outputCount_1 + 1);
for (int i_2 = 0; i_2 < outputCount_1; i_2++)
{
neuronsChromosome.Add(new NEATNeuronGene(
NEATNeuronType.Output, i_2 + inputCount_0 + 1, 1, (i_2 + 1)
* outputRowSlice));
}
for (int i_3 = 0; i_3 < inputCount_0 + 1; i_3++)
{
for (int j = 0; j < outputCount_1; j++)
{
linksChromosome.Add(new NEATLinkGene(
((NEATNeuronGene)neuronsChromosome.Get(i_3)).Id,
((NEATNeuronGene)Neurons.Get(
inputCount_0 + j + 1)).Id, true, inputCount_0
+ outputCount_1 + 1 + NumGenes,
RangeRandomizer.Randomize(-1, 1), false));
}
}
}
/// <summary>
/// Mutate the genome by adding a neuron.
/// </summary>
///
/// <param name="mutationRate">The mutation rate.</param>
/// <param name="numTrysToFindOldLink">The number of tries to find a link to split.</param>
internal void AddNeuron(double mutationRate, int numTrysToFindOldLink)
{
// should we add a neuron?
if (ThreadSafeRandom.NextDouble() > mutationRate)
{
return;
}
int countTrysToFindOldLink = numTrysToFindOldLink;
// the link to split
NEATLinkGene splitLink = null;
int sizeBias = inputCount + outputCount + 10;
// if there are not at least
int upperLimit;
if (linksChromosome.Size() < sizeBias)
{
upperLimit = NumGenes - 1 - (int)Math.Sqrt(NumGenes);
}
else
{
upperLimit = NumGenes - 1;
}
while ((countTrysToFindOldLink--) > 0)
{
// choose a link, use the square root to prefer the older links
int i = RangeRandomizer.RandomInt(0, upperLimit);
var link = (NEATLinkGene)linksChromosome
.Get(i);
// get the from neuron
long fromNeuron = link.FromNeuronID;
if ((link.Enabled) &&
(!link.Recurrent) &&
(((NEATNeuronGene)Neurons.Get(
GetElementPos(fromNeuron))).NeuronType != NEATNeuronType.Bias))
{
splitLink = link;
break;
}
}
if (splitLink == null)
{
return;
}
splitLink.Enabled = false;
double originalWeight = splitLink.Weight;
long from = splitLink.FromNeuronID;
long to = splitLink.ToNeuronID;
var fromGene = (NEATNeuronGene)Neurons.Get(
GetElementPos(from));
var toGene = (NEATNeuronGene)Neurons.Get(
GetElementPos(to));
double newDepth = (fromGene.SplitY + toGene.SplitY) / 2;
double newWidth = (fromGene.SplitX + toGene.SplitX) / 2;
// has this innovation already been tried?
NEATInnovation innovation = ((NEATTraining)GA).Innovations.CheckInnovation(from, to,
NEATInnovationType
.NewNeuron);
// prevent chaining
if (innovation != null)
{
long neuronID = innovation.NeuronID;
if (AlreadyHaveThisNeuronID(neuronID))
{
innovation = null;
}
}
if (innovation == null)
{
// this innovation has not been tried, create it
long newNeuronID = ((NEATTraining)GA).Innovations.CreateNewInnovation(from, to,
NEATInnovationType.
NewNeuron,
NEATNeuronType.
Hidden,
newWidth, newDepth);
neuronsChromosome.Add(new NEATNeuronGene(
NEATNeuronType.Hidden, newNeuronID, newDepth, newWidth));
// add the first link
long link1ID = (GA).Population.AssignInnovationID();
((NEATTraining)GA).Innovations
.CreateNewInnovation(from, newNeuronID,
NEATInnovationType.NewLink);
var link1 = new NEATLinkGene(from, newNeuronID,
true, link1ID, 1.0d, false);
linksChromosome.Add(link1);
// add the second link
long link2ID = (GA).Population.AssignInnovationID();
((NEATTraining)GA).Innovations
.CreateNewInnovation(newNeuronID, to,
NEATInnovationType.NewLink);
var link2 = new NEATLinkGene(newNeuronID, to, true,
link2ID, originalWeight, false);
linksChromosome.Add(link2);
}
else
{
// existing innovation
long newNeuronID_0 = innovation.NeuronID;
NEATInnovation innovationLink1 = ((NEATTraining)GA).Innovations.CheckInnovation(from,
newNeuronID_0,
NEATInnovationType
.
NewLink);
NEATInnovation innovationLink2 =
((NEATTraining)GA).Innovations.CheckInnovation(newNeuronID_0, to,
NEATInnovationType.NewLink);
if ((innovationLink1 == null) || (innovationLink2 == null))
{
throw new NeuralNetworkError("NEAT Error");
}
var link1_1 = new NEATLinkGene(from, newNeuronID_0,
true, innovationLink1.InnovationID, 1.0d, false);
var link2_2 = new NEATLinkGene(newNeuronID_0, to, true,
innovationLink2.InnovationID, originalWeight, false);
linksChromosome.Add(link1_1);
linksChromosome.Add(link2_2);
var newNeuron = new NEATNeuronGene(
NEATNeuronType.Hidden, newNeuronID_0, newDepth, newWidth);
neuronsChromosome.Add(newNeuron);
}
return;
}
