ec.es
Class ESSelection
java.lang.Object
ec.BreedingSource
ec.SelectionMethod
ec.es.ESSelection
- All Implemented Interfaces:
- Prototype, Setup, RandomChoiceChooser, java.io.Serializable, java.lang.Cloneable
public class ESSelection
- extends SelectionMethod
ESSelection is a special SelectionMethod designed to be used with
evolutionary strategies-type breeders.
To do evolution strategies evolution, the
breeding pipelines should contain at least one ESSelection selection method.
While a child is being generated by the pipeline, the ESSelection object will return a parent
from the pool of mu parents. The particular parent is chosen round-robin, so all the parents
will have an equal number of children. It's perfectly fine to have more than one ESSelection
object in the tree, or to call the same one repeatedly during the course of generating a child;
all such objects will consistently return the same parent. They only increment to the nex
parent in the pool of mu parents after the child has been created from the pipeline. You can
also mix ESSelection operators with other operators (like Tournament Selection). But you ought
to have at least one ESSelection operator in the pipeline -- else it wouldn't be Evolution
Strategies, would it?
Default Base
es.select
- See Also:
- Serialized Form
Method Summary |
Parameter |
defaultBase()
Returns the default base for this prototype. |
void |
prepareToProduce(EvolutionState state,
int subpopulation,
int thread)
A default version of prepareToProduce which does nothing. |
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. |
int |
produce(int min,
int max,
int start,
int subpopulation,
Individual[] inds,
EvolutionState state,
int thread)
Produces n individuals from the given subpopulation
and puts them into inds[start...start+n-1],
where n = Min(Max(q,min),max), where q is the "typical" number of
individuals the BreedingSource produces in one shot, and returns
n. |
Methods inherited from class java.lang.Object |
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
P_ESSELECT
public static final java.lang.String P_ESSELECT
- See Also:
- Constant Field Values
ESSelection
public ESSelection()
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(...).
prepareToProduce
public void prepareToProduce(EvolutionState state,
int subpopulation,
int thread)
- Description copied from class:
SelectionMethod
- A default version of prepareToProduce which does nothing.
- Overrides:
prepareToProduce
in class SelectionMethod
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.
- Specified by:
produce
in class SelectionMethod
produce
public int produce(int min,
int max,
int start,
int subpopulation,
Individual[] inds,
EvolutionState state,
int thread)
- Description copied from class:
BreedingSource
- Produces n individuals from the given subpopulation
and puts them into inds[start...start+n-1],
where n = Min(Max(q,min),max), where q is the "typical" number of
individuals the BreedingSource produces in one shot, and returns
n. max must be >= min, and min must be >= 1. For example, crossover
might typically produce two individuals, tournament selection might typically
produce a single individual, etc.
- Overrides:
produce
in class SelectionMethod