Last change
on this file since 12700 was
6152,
checked in by bfarka, 13 years ago
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added ecj and custom statistics to communicate with the okb services #1441
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File size:
1.5 KB
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Rev | Line | |
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[6152] | 1 | /* |
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| 2 | Copyright 2006 by Sean Luke |
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| 3 | Licensed under the Academic Free License version 3.0 |
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| 4 | See the file "LICENSE" for more information |
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| 5 | */ |
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| 6 | |
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| 7 | |
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| 8 | package ec.gp; |
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| 9 | import ec.*; |
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| 10 | |
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| 11 | /* |
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| 12 | * GPNodeSelector.java |
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| 13 | * |
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| 14 | * Created: Tue Oct 12 17:08:10 1999 |
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| 15 | * By: Sean Luke |
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| 16 | */ |
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| 17 | |
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| 18 | /** |
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| 19 | * GPNodeSelector is a Prototype which describes algorithms which |
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| 20 | * select random nodes out of trees, typically marking them for |
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| 21 | * mutation, crossover, or whatnot. GPNodeSelectors can cache information |
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| 22 | * about a tree, as they may receive the pickNode(...) method more than |
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| 23 | * once on a tree. But this should really only be done if it can be |
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| 24 | * done relatively efficiently; it's not all that common. A GPNodeSelector |
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| 25 | * will be called reset() just before it is pressed into service in |
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| 26 | * selecting nodes from a new tree, which gives it the chance to |
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| 27 | * reset caches, etc. |
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| 28 | * |
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| 29 | * @author Sean Luke |
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| 30 | * @version 1.0 |
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| 31 | */ |
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| 32 | |
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| 33 | public interface GPNodeSelector extends Prototype |
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| 34 | { |
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| 35 | /** Picks a node at random from tree and returns it. The tree |
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| 36 | is located in ind, which is located in s.population[subpopulation]. |
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| 37 | This method will be preceded with a call to reset(); |
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| 38 | afterwards, pickNode(...) may be called several times for the |
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| 39 | same tree. |
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| 40 | */ |
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| 41 | |
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| 42 | public abstract GPNode pickNode(final EvolutionState s, |
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| 43 | final int subpopulation, |
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| 44 | final int thread, |
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| 45 | final GPIndividual ind, |
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| 46 | final GPTree tree); |
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| 47 | |
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| 48 | /** Resets the Node Selector before a new series of pickNode() |
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| 49 | if need be. */ |
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| 50 | public abstract void reset(); |
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| 51 | |
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| 52 | } |
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