ec.parsimony

Class DoubleTournamentSelection

java.lang.Object

ec.BreedingSource

ec.SelectionMethod

ec.parsimony.DoubleTournamentSelection

All Implemented Interfaces:

Prototype, Setup, SteadyStateBSourceForm, RandomChoiceChooserD, Serializable, Cloneable

public class DoubleTournamentSelection
extends SelectionMethod
implements SteadyStateBSourceForm

Version:

1.0

Author:

Sean Luke & Liviu Panait

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
boolean	doLengthFirst
static String	P_DOLENGTHFIRST
static String	P_PICKWORST
static String	P_PICKWORST2
static String	P_SIZE size parameter
static String	P_SIZE2
static String	P_TOURNAMENT default base
boolean	pickWorst Do we pick the worst instead of the best?
boolean	pickWorst2
double	probabilityOfSelection What's our probability of selection? If 1.0, we always pick the "good" individual.
double	probabilityOfSelection2
int	size Size of the tournament
int	size2

Fields inherited from class ec.SelectionMethod

INDS_PRODUCED

Fields inherited from class ec.BreedingSource

NO_PROBABILITY, P_PROB, probability

Constructor Summary

Constructors

Constructor and Description
DoubleTournamentSelection()

Method Summary

Methods

Modifier and Type	Method and Description
Parameter	defaultBase() Returns the default base for this prototype.
void	individualReplaced(SteadyStateEvolutionState state, int subpopulation, int thread, int individual) Called whenever an individual has been replaced by another in the population.
int	make(int subpopulation, EvolutionState state, int thread) Produces the index of a person selected from among several by a tournament.
int	produce(int subpopulation, EvolutionState state, int thread) Produces the index of a person selected from among several by a tournament.
void	setup(EvolutionState state, Parameter base) Sets up the BreedingPipeline.
void	sourcesAreProperForm(SteadyStateEvolutionState state) Issue an error (not a fatal -- we guarantee that callers of this method will also call exitIfErrors) if any of your sources, or their sources, etc., are not of SteadyStateBSourceForm.

Methods inherited from class ec.SelectionMethod

finishProducing, prepareToProduce, produce, produces, typicalIndsProduced

Methods inherited from class ec.BreedingSource

clone, getProbability, pickRandom, preparePipeline, setProbability, setupProbabilities

Methods inherited from class java.lang.Object

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

Field Detail

P_TOURNAMENT

public static final String P_TOURNAMENT

default base

See Also:

Constant Field Values

P_PICKWORST

public static final String P_PICKWORST

See Also:

Constant Field Values

P_PICKWORST2

public static final String P_PICKWORST2

See Also:

Constant Field Values

P_DOLENGTHFIRST

public static final String P_DOLENGTHFIRST

See Also:

Constant Field Values

P_SIZE

public static final String P_SIZE

size parameter

See Also:

Constant Field Values

P_SIZE2

public static final String P_SIZE2

See Also:

Constant Field Values

size

public int size

Size of the tournament

size2

public int size2

probabilityOfSelection

public double probabilityOfSelection

What's our probability of selection? If 1.0, we always pick the "good" individual.

probabilityOfSelection2

public double probabilityOfSelection2

pickWorst

public boolean pickWorst

Do we pick the worst instead of the best?

pickWorst2

public boolean pickWorst2

doLengthFirst

public boolean doLengthFirst

Constructor Detail

DoubleTournamentSelection

public DoubleTournamentSelection()

Method Detail

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

setup

public void setup(EvolutionState state,
         Parameter base)

Description copied from class: BreedingSource

Sets up the BreedingPipeline. You can use state.output.error here because the top-level caller promises to call exitIfErrors() after calling setup. Note that probability might get modified again by an external source if it doesn't normalize right.

The most common modification is to normalize it with some other set of probabilities, then set all of them up in increasing summation; this allows the use of the fast static BreedingSource-picking utility method, BreedingSource.pickRandom(...). In order to use this method, for example, if four breeding source probabilities are {0.3, 0.2, 0.1, 0.4}, then they should get normalized and summed by the outside owners as: {0.3, 0.5, 0.6, 1.0}.

Specified by:

setup in interface Prototype

Specified by:

setup in interface Setup

Overrides:

setup in class BreedingSource

See Also:

Prototype.setup(EvolutionState,Parameter)

produce

public int produce(int subpopulation,
          EvolutionState state,
          int thread)

Produces the index of a person selected from among several by a tournament. The tournament's criteria is fitness of individuals if doLengthFirst is true, otherwise the size of the individuals.

Specified by:

produce in class SelectionMethod

make

public int make(int subpopulation,
       EvolutionState state,
       int thread)

Produces the index of a person selected from among several by a tournament. The tournament's criteria is size of individuals if doLengthFirst is true, otherwise the fitness of the individuals.

individualReplaced

public void individualReplaced(SteadyStateEvolutionState state,
                      int subpopulation,
                      int thread,
                      int individual)

Description copied from interface: SteadyStateBSourceForm

Called whenever an individual has been replaced by another in the population.

Specified by:

individualReplaced in interface SteadyStateBSourceForm

sourcesAreProperForm

public void sourcesAreProperForm(SteadyStateEvolutionState state)

Description copied from interface: SteadyStateBSourceForm

Issue an error (not a fatal -- we guarantee that callers of this method will also call exitIfErrors) if any of your sources, or their sources, etc., are not of SteadyStateBSourceForm.

Specified by:

sourcesAreProperForm in interface SteadyStateBSourceForm