private static void MutateSynapseFromNeuron(Ann ann)
{
if (HelperCountSynapses(ann) == 0)
{
return;
}
Neuron synapseNeuron = ann.GetAllNeurons()[Util.rand.Next(ann.GetAllNeurons().Count)];
if (synapseNeuron.synapses.Count == 0)
{
return;
}
Synapse synapse = synapseNeuron.synapses[Util.rand.Next(synapseNeuron.synapses.Count)];
int fromLayer = synapse.FromLayer;
Neuron[] neuronsInLayer = ann.GetNeuronsForLayer(fromLayer);
Neuron neuron = neuronsInLayer.Length != 0 ? neuronsInLayer[Util.rand.Next(neuronsInLayer.Length)] : null;
int newNeuronPosition = neuron != null ? neuron.NeuronPosition : 0;
if (!HelperDoesSynapseExist(ann, synapse.FromLayer, newNeuronPosition))
{
synapse.FromNeuron = newNeuronPosition;
}
}
private static void MutateSynapseRemoveRandom(Ann ann)
{
if (HelperCountSynapses(ann) == 0)
{
return;
}
Neuron neuron = ann.GetAllNeurons()[Util.rand.Next(ann.GetAllNeurons().Count)];
if (neuron.synapses.Count == 0)
{
return;
}
neuron.synapses.RemoveAt(Util.rand.Next(neuron.synapses.Count));
}
private static void MutateSynapseWeightIncreaseRandom(Ann ann)
{
if (HelperCountSynapses(ann) == 0)
{
return;
}
Neuron synapseNeuron = ann.GetAllNeurons()[Util.rand.Next(ann.GetAllNeurons().Count)];
if (synapseNeuron.synapses.Count == 0)
{
return;
}
Synapse synapse = synapseNeuron.synapses[Util.rand.Next(synapseNeuron.synapses.Count)];
synapse.Weight += Util.rand.NextDouble();
}
private static void MutateSynapseAddRandom(Ann ann)
{
if (ann.hiddenNeurons.Count == 0)
{
return;
}
int[] layers = ann.GetAllLayers();
int fromLayer = layers.Length != 0 ? layers[Util.rand.Next(layers.Length)] : 0;
int[] fromNeuronPositions = ann.GetNeuronsForLayer(fromLayer).Select(x => x.NeuronPosition).ToArray();
int fromNeuron = fromNeuronPositions[Util.rand.Next(fromNeuronPositions.Length)];
Neuron synapseNeuron = ann.GetAllNeurons()[Util.rand.Next(ann.GetAllNeurons().Count)];
if (!HelperDoesSynapseExist(ann, fromLayer, fromNeuron))
{
synapseNeuron.synapses.Add(new Synapse(fromLayer, fromNeuron));
}
}
private static int HelperCountSynapses(Ann ann)
{
int synapseCount = 0;
foreach (Neuron neuron in ann.GetAllNeurons())
{
foreach (Synapse synapse in neuron.synapses)
{
synapseCount++;
}
}
return(synapseCount);
}
private static void MutateSynapseFromLayer(Ann ann)
{
if (HelperCountSynapses(ann) == 0)
{
return;
}
Neuron synapseNeuron = ann.GetAllNeurons()[Util.rand.Next(ann.GetAllNeurons().Count)];
if (synapseNeuron.synapses.Count == 0)
{
return;
}
Synapse synapse = synapseNeuron.synapses[Util.rand.Next(synapseNeuron.synapses.Count)];
int layer = ann.GetAllLayers()[Util.rand.Next(ann.GetAllLayers().Length)];
if (!HelperDoesSynapseExist(ann, layer, synapse.FromNeuron))
{
synapse.FromLayer = layer;
}
}
private static void HelperCleanUpBackwardsSynapses(Ann ann)
{
foreach (Neuron neuron in ann.GetAllNeurons())
{
List <Synapse> synapseChecklist = new List <Synapse>();
foreach (Synapse synapse in neuron.synapses)
{
if (synapse.FromLayer > neuron.Layer)
{
synapseChecklist.Add(synapse);
}
}
neuron.synapses = synapseChecklist;
}
}
private static bool HelperDoesSynapseExist(Ann ann, int fromLayer, int fromNeuron)
{
bool exists = false;
foreach (Neuron neuron in ann.GetAllNeurons())
{
foreach (Synapse synapse in neuron.synapses)
{
if (synapse.FromLayer == fromLayer && synapse.FromNeuron == fromNeuron)
{
exists = true;
}
}
}
return(exists);
}
private static void HelperCleanUpDuplicates(Ann ann)
{
List <Neuron> neuronCheckList = new List <Neuron>();
foreach (Neuron neuron in ann.GetAllNeurons())
{
List <Synapse> synapseCheckList = new List <Synapse>();
foreach (Synapse synapse in neuron.synapses)
{
bool foundOnChecklist = false;
foreach (Synapse synapseFromCheckList in synapseCheckList)
{
if (synapse.FromLayer == synapseFromCheckList.FromLayer && synapse.FromNeuron == synapseFromCheckList.FromNeuron)
{
foundOnChecklist = true;
}
}
if (!foundOnChecklist)
{
synapseCheckList.Add(synapse);
}
}
neuron.synapses = synapseCheckList;
}
foreach (Neuron neuron in ann.hiddenNeurons)
{
bool foundOnChecklist = false;
foreach (Neuron neuronFromCheckList in neuronCheckList)
{
if (neuron.Layer == neuronFromCheckList.Layer &&
neuron.NeuronPosition == neuronFromCheckList.NeuronPosition)
{
foundOnChecklist = true;
}
}
if (!foundOnChecklist)
{
neuronCheckList.Add(neuron);
}
}
ann.hiddenNeurons = neuronCheckList;
}
private static void MutateNeuronBiasDecreaseRandom(Ann ann)
{
ann.GetAllNeurons()[Util.rand.Next(ann.GetAllNeurons().Count)].Bias -= Util.rand.NextDouble() * 100;
}
private static void MutateNeuronBiasRandomize(Ann ann)
{
ann.GetAllNeurons()[Util.rand.Next(ann.GetAllNeurons().Count)].Bias = Util.rand.NextDouble();
}