ec.parsimony
Class LexicographicTournament

java.lang.Object
  |
  +--ec.BreedingSource
        |
        +--ec.SelectionMethod
              |
              +--ec.parsimony.LexicographicTournament
All Implemented Interfaces:
java.lang.Cloneable, Prototype, RandomChoiceChooser, java.io.Serializable, Setup, SteadyStateBSourceForm

public class LexicographicTournament
extends SelectionMethod
implements SteadyStateBSourceForm

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
static int DEFAULT_SIZE
          Default size
static java.lang.String P_PICKWORST
           
static java.lang.String P_SIZE
          size parameter
static java.lang.String P_TOURNAMENT
          default base
 boolean pickWorst
          Do we pick the worst instead of the best?
 int size
          Size of the tournament
 
Fields inherited from class ec.SelectionMethod
INDS_PRODUCED
 
Fields inherited from class ec.BreedingSource
CHECKBOUNDARY, DEFAULT_PRODUCED, NO_PROBABILITY, P_PROB, probability, UNUSED
 
Constructor Summary
LexicographicTournament()
           
 
Method Summary
 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          Called whenever an individual has been replaced by another in the population.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 produce(int subpopulation, EvolutionState state, int thread)
          An alternative form of "produce" special to Selection Methods; selects an individual from the given subpopulation and returns its position in that subpopulation.
 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, preparePipeline, prepareToProduce, produce, produces, typicalIndsProduced
 
Methods inherited from class ec.BreedingSource
getProbability, pickRandom, protoClone, protoCloneSimple, setProbability, setupProbabilities
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

P_TOURNAMENT

public static final java.lang.String P_TOURNAMENT
default base

P_PICKWORST

public static final java.lang.String P_PICKWORST

P_SIZE

public static final java.lang.String P_SIZE
size parameter

DEFAULT_SIZE

public static final int DEFAULT_SIZE
Default size

size

public int size
Size of the tournament

pickWorst

public boolean pickWorst
Do we pick the worst instead of the best?
Constructor Detail

LexicographicTournament

public LexicographicTournament()
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(...).

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}.

Overrides:
setup in class BreedingSource
Following copied from class: ec.BreedingSource
See Also:
Prototype.setup(EvolutionState,Parameter)

produce

public int produce(int subpopulation,
                   EvolutionState state,
                   int thread)
Description copied from class: SelectionMethod
An alternative form of "produce" special to Selection Methods; selects an individual from the given subpopulation and returns its position in that subpopulation.
Overrides:
produce in class SelectionMethod

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