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java.lang.Objectec.Breeder
ec.simple.SimpleBreeder
ec.steadystate.SteadyStateBreeder
public class SteadyStateBreeder
This subclass of Breeder performs the evaluation portion of Steady-State Evolution and (in distributed form) Asynchronous Evolution. The procedure is as follows. We begin with an empty Population and one by one create new Indivdiuals and send them off to be evaluated. In basic Steady-State Evolution the individuals are immediately evaluated and we wait for them; but in Asynchronous Evolution the individuals are evaluated for however long it takes and we don't wait for them to finish. When individuals return they are added to the Population until it is full. No duplicate individuals are allowed.
At this point the system switches to its "steady state": individuals are bred from the population one by one, and sent off to be evaluated. Once again, in basic Steady-State Evolution the individuals are immediately evaluated and we wait for them; but in Asynchronous Evolution the individuals are evaluated for however long it takes and we don't wait for them to finish. When an individual returns, we mark an individual in the Population for death, then replace it with the new returning individual. Note that during the steady-state, Asynchronous Evolution could be still sending back some "new" individuals created during the initialization phase, not "bred" individuals.
The determination of how an individual is marked for death is done by the SteadyStateBreeder. This is a SelectionMethod. Note that this SelectionMethod probably should not be selecting for the "fittest" individuals, but rather for either random individuals (the standard approach) or for "bad" individuals.
Parameters
deselector classname, inherits and != ec.SelectionMethod |
(The SelectionMethod used to pick individuals for death) |
Field Summary | |
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static java.lang.String |
P_DESELECTOR
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Fields inherited from class ec.simple.SimpleBreeder |
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elite, P_ELITE, P_REEVALUATE_ELITES, reevaluateElites |
Constructor Summary | |
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SteadyStateBreeder()
Do we allow duplicates? |
Method Summary | |
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Individual |
breedIndividual(EvolutionState state,
int subpop,
int thread)
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void |
finishPipelines(EvolutionState state)
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void |
individualReplaced(SteadyStateEvolutionState state,
int subpopulation,
int thread,
int individual)
Called whenever individuals have been replaced by new individuals in the population. |
void |
prepareToBreed(EvolutionState state,
int thread)
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void |
setup(EvolutionState state,
Parameter base)
Sets up the object by reading it from the parameters stored in state, built off of the parameter base base. |
void |
sourcesAreProperForm(SteadyStateEvolutionState state,
BreedingPipeline[] breedingPipelines)
Called to check to see if the breeding sources are correct -- if you use this method, you must call state.output.exitIfErrors() immediately afterwards. |
Methods inherited from class ec.simple.SimpleBreeder |
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breedPopChunk, breedPopulation, computeSubpopulationLength, loadElites, unmarkElitesEvaluated |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final java.lang.String P_DESELECTOR
Constructor Detail |
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public SteadyStateBreeder()
Method Detail |
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public void setup(EvolutionState state, Parameter base)
Setup
setup
in interface Setup
setup
in class SimpleBreeder
public void sourcesAreProperForm(SteadyStateEvolutionState state, BreedingPipeline[] breedingPipelines)
public void individualReplaced(SteadyStateEvolutionState state, int subpopulation, int thread, int individual)
public void finishPipelines(EvolutionState state)
public void prepareToBreed(EvolutionState state, int thread)
public Individual breedIndividual(EvolutionState state, int subpop, int thread)
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