ec.parsimony
Class DoubleTournamentSelection

java.lang.Object
  extended by ec.BreedingSource
      extended by ec.SelectionMethod
          extended by ec.parsimony.DoubleTournamentSelection
All Implemented Interfaces:
Prototype, Setup, SteadyStateBSourceForm, RandomChoiceChooser, java.io.Serializable, java.lang.Cloneable

public class DoubleTournamentSelection
extends SelectionMethod
implements SteadyStateBSourceForm

Version:
1.0
Author:
Sean Luke & Liviu Panait
See Also:
Serialized Form

Field Summary
static int DEFAULT_SIZE
           
 boolean doLengthFirst
           
static java.lang.String P_DOLENGTHFIRST
           
static java.lang.String P_PICKWORST
           
static java.lang.String P_PICKWORST2
           
static java.lang.String P_SIZE
          size parameter
static java.lang.String P_SIZE2
           
static java.lang.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
CHECKBOUNDARY, DEFAULT_PRODUCED, NO_PROBABILITY, P_PROB, probability, UNUSED
 
Constructor Summary
DoubleTournamentSelection()
           
 
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          Called whenever an individual has been replaced by another in the population.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 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, preparePipeline, prepareToProduce, produce, produces, typicalIndsProduced
 
Methods inherited from class ec.BreedingSource
clone, getProbability, pickRandom, 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 java.lang.String P_TOURNAMENT
default base

See Also:
Constant Field Values

P_PICKWORST

public static final java.lang.String P_PICKWORST
See Also:
Constant Field Values

P_PICKWORST2

public static final java.lang.String P_PICKWORST2
See Also:
Constant Field Values

P_DOLENGTHFIRST

public static final java.lang.String P_DOLENGTHFIRST
See Also:
Constant Field Values

P_SIZE

public static final java.lang.String P_SIZE
size parameter

See Also:
Constant Field Values

P_SIZE2

public static final java.lang.String P_SIZE2
See Also:
Constant Field Values

DEFAULT_SIZE

public static final int DEFAULT_SIZE
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