* Build the CPPN activation functions.
* @param activationFunctions The activation functions collection to add to.
*/
public static void buildCPPNActivationFunctions(
final ChooseObject<ActivationFunction> activationFunctions) {
activationFunctions.add(0.25, new ActivationClippedLinear());
activationFunctions.add(0.25, new ActivationBipolarSteepenedSigmoid());
activationFunctions.add(0.25, new ActivationGaussian());
activationFunctions.add(0.25, new ActivationSIN());
activationFunctions.finalizeStructure();
}