Package ec.parsimony

Class LexicographicTournamentSelection

java.lang.Object

ec.BreedingSource

ec.SelectionMethod

ec.select.TournamentSelection

ec.parsimony.LexicographicTournamentSelection

All Implemented Interfaces:

Prototype, Setup, SteadyStateBSourceForm, RandomChoiceChooserD, Serializable, Cloneable

public class LexicographicTournamentSelection
extends TournamentSelection

Does a simple tournament selection, limited to the subpopulation it's working in at the time.

Tournament selection works like this: first, size individuals are chosen at random from the population. Then of those individuals, the one with the best fitness is selected. If two individuals have the same fitness, the one with smaller size is prefered. The default tournament size is 7.

Typical Number of Individuals Produced Per produce(...) call
Always 1.

Parameters

base.size int >= 1	(the tournament size)
base.pick-worst bool = true or false (default)	(should we pick the worst individual in the tournament instead of the best?)

Default Base
select.lexicographic-tournament

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static final String	P_TOURNAMENT	default base

Fields inherited from class ec.select.TournamentSelection

P_PICKWORST, P_SIZE, pickWorst, probabilityOfPickingSizePlusOne, size

Fields inherited from class ec.SelectionMethod

INDS_PRODUCED, KEY_PARENTS

Fields inherited from class ec.BreedingSource

NO_PROBABILITY, P_PROB, probability

Constructor Summary

Constructors

Constructor	Description
LexicographicTournamentSelection()

Method Summary

Modifier and Type	Method	Description
boolean	betterThan(Individual first, Individual second, int subpopulation, EvolutionState state, int thread)	Returns true if *first* is a better (fitter, whatever) individual than *second*.
Parameter	defaultBase()	Returns the default base for this prototype.

Methods inherited from class ec.select.TournamentSelection

getRandomIndividual, getTournamentSizeToUse, individualReplaced, produce, setup, sourcesAreProperForm

Methods inherited from class ec.SelectionMethod

finishProducing, prepareToProduce, produce, produces, produceWithoutCloning, typicalIndsProduced

Methods inherited from class ec.BreedingSource

clone, fillStubs, getProbability, pickRandom, preparePipeline, setProbability, setupProbabilities

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

P_TOURNAMENT

public static final String P_TOURNAMENT

default base

See Also:

• Constant Field Values

Constructor Details

LexicographicTournamentSelection

public LexicographicTournamentSelection()

Method Details

defaultBase

public Parameter defaultBase()

Description copied from interface: Prototype

Returns the default base for this prototype. This should generally be implemented by building off of the static base() method on the DefaultsForm object for the prototype's package. This should be callable during setup(...).

Specified by:

defaultBase in interface Prototype

Overrides:

defaultBase in class TournamentSelection

betterThan

public boolean betterThan(Individual first,
 Individual second,
 int subpopulation,
 EvolutionState state,
 int thread)

Description copied from class: TournamentSelection

Returns true if *first* is a better (fitter, whatever) individual than *second*.

Overrides:

betterThan in class TournamentSelection