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

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.