/// <summary>
/// Gets a random kown activation function excluding the given activation function.
/// </summary>
/// <param name="excluding_activationFunction">The activation function to exclude from the search.</param>
/// <returns>The random known activation function.</returns>
public Node.ActivationFunction GetRandomActivationFunction(Node.ActivationFunction excluding_activationFunction)
{
if (known_activationFunctions.Count == 0)
{
return(null);
}
else if (known_activationFunctions.Count == 1)
{
return(known_activationFunctions[0]);
}
int choice = -1;
int index = known_activationFunctions.IndexOf(excluding_activationFunction);
if (index == -1)
{
choice = Random.Next(known_activationFunctions.Count);
}
else
{
choice = Random.Next(known_activationFunctions.Count - 1);
if (choice >= index)
{
++choice;
}
}
return(known_activationFunctions[choice]);
}
/// <summary>
/// Constructs a node gene with the given node gene pattern and activation function.
/// </summary>
/// <param name="nodeGenePattern">The node gene pattern that this node gene implements.</param>
/// <param name="activationFunction">The activation function of the node.</param>
/// <exception cref="ArgumentNullException">When the node gene pattern or activation function is null.</exception>
protected internal NodeGene(NodeGenePattern nodeGenePattern, Node.ActivationFunction activationFunction)
{
Helpers.ThrowOnNull(nodeGenePattern, "nodeGenePattern");
Helpers.ThrowOnNull(activationFunction, "activationFunction");
NodeGenePattern = nodeGenePattern;
ActivationFunction = activationFunction;
}
/// <summary>
/// Adds the given activation function to the known activation functions.
/// </summary>
/// <param name="activationFunction">The activation function to add.</param>
/// <returns>False if activation function is already added. True otherwise.</returns>
public bool Add_KnownActivationFunction(Node.ActivationFunction activationFunction)
{
if (known_activationFunctions.Contains(activationFunction))
{
return(false);
}
known_activationFunctions.Add(activationFunction);
return(true);
}
/// <summary>
/// Creates a node gene with the given pattern and activation function.
/// </summary>
/// <param name="nodeGenePattern">The node gene pattern of the node gene.</param>
/// <param name="activationFunction">The activation function of the node gene.</param>
/// <returns>The created node gene.</returns>
/// <exception cref="ArgumentNullException">When the node gene pattern or activation function is null.</exception>
public NodeGene Create_NodeGene(NodeGenePattern nodeGenePattern, Node.ActivationFunction activationFunction)
{
return(new NodeGene(nodeGenePattern, activationFunction));
}
