ec.gp

Interface GPNodeSelector

All Superinterfaces:

java.lang.Cloneable, Prototype, java.io.Serializable, Setup

All Known Implementing Classes:

KozaNodeSelector

public interface GPNodeSelector
extends Prototype

GPNodeSelector is a Prototype which describes algorithms which select random nodes out of trees, typically marking them for mutation, crossover, or whatnot. GPNodeSelectors can cache information about a tree, as they may receive the pickNode(...) method more than once on a tree. But this should really only be done if it can be done relatively efficiently; it's not all that common. A GPNodeSelector will be called reset() just before it is pressed into service in selecting nodes from a new tree, which gives it the chance to reset caches, etc.

Method Summary

Modifier and Type	Method and Description
GPNode	pickNode(EvolutionState s, int subpopulation, int thread, GPIndividual ind, GPTree tree) Picks a node at random from tree and returns it.
void	reset() Resets the Node Selector before a new series of pickNode() if need be.

Methods inherited from interface ec.Prototype

clone, defaultBase, setup

Method Detail

pickNode

GPNode pickNode(EvolutionState s,
                int subpopulation,
                int thread,
                GPIndividual ind,
                GPTree tree)

Picks a node at random from tree and returns it. The tree is located in ind, which is located in s.population[subpopulation]. This method will be preceded with a call to reset(); afterwards, pickNode(...) may be called several times for the same tree.

reset

void reset()

Resets the Node Selector before a new series of pickNode() if need be.