protected override void PerformMutation(IGraphChromosome graph, float probability)
{
if (RandomizationProvider.Current.GetDouble() >= probability)
{
return;
}
// No edges to add
if (graph.EdgeCount == graph.VertexCount * graph.VertexCount)
{
return;
}
// Shuffle
var allIDs = graph.Vertices.Select(v => v.ID);
uint[] fromVerts = MutationService.Shuffle(allIDs, RandomizationProvider.Current).ToArray();
uint[] toVerts = MutationService.Shuffle(allIDs, RandomizationProvider.Current).ToArray();
// Find the first that does not exist
foreach (var v1 in fromVerts)
{
foreach (var v2 in toVerts)
{
if (!graph.ContainsEdge(v1, v2))
{
graph.AddEdge(v1, v2, graph.CreateNewEdge());
return;
}
}
}
}
public override double Evaluate(IBlackBox net)
{
if (net.InputCount != 2 || net.OutputCount != 1)
{
throw new IndexOutOfRangeException();
}
var inputs = MutationService.Shuffle(Inputs, RandomizationProvider.Current);
double error = 0;
foreach (var ins in inputs)
{
net.Reset();
net.SetInputs(ins);
net.Activate(3);
double output = net.GetOutput(0);
double expected = (ins[0] == ins[1]) ? 0 : 1;
double diff = output - expected;
error += (diff >= 0) ? diff : -diff;
}
return(4 - error);
}
