/// <summary>
/// Prunes the network in the given direction for the specified number of layers.
/// </summary>
/// <param name="network">Current network.</param>
/// <param name="backwards">If true, removes layer by layer in reverse order (i.e. output layer first).</param>
/// <param name="layers">Number of layers to prune from the network.</param>
public static Network Prune(this Network network, bool backwards = true, int layers = 1)
{
int count = layers;
int layer = (backwards ? (network.Layers - 1) : 0);
while (count > 0)
{
count--;
var nodes = network.GetNodes(layer);
for (int i = 0; i < nodes.Count(); i++)
{
network.RemoveNode(nodes.ElementAt(i));
}
layer = (backwards ? --layer : ++layer);
}
network.Reindex();
// remove bias outputs
var outputs = network.GetNodes(network.Layers - 1).Where(w => w.IsBias);
for (int x = 0; x < outputs.Count(); x++)
{
network.RemoveNode(outputs.ElementAt(x));
}
for (int i = 0; i < network.GetNodes(0).Count(); i++)
{
network.GetNodes(0).ElementAt(i).In.Clear();
}
network.In = network.GetNodes(0).ToArray();
for (int i = 0; i < network.GetNodes(network.Layers - 1).Count(); i++)
{
network.GetNodes(network.Layers - 1).ElementAt(i).Out.Clear();
}
network.Out = network.GetNodes(network.Layers - 1).ToArray();
return(network);
}