pl.edu.agh.age.compute.stream.emas.migration

Enum MigrationStrategy

java.lang.Object

java.lang.Enum<MigrationStrategy>

pl.edu.agh.age.compute.stream.emas.migration.MigrationStrategy

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<MigrationStrategy>

public enum MigrationStrategy
extends java.lang.Enum<MigrationStrategy>

The strategies for agents migration.

Deterministic strategies (random, highest fitness and lowest fitness) are quite obvious in their behavior. Probabilistic strategies choose agents based on their evaluation quality. Agents with a better evaluation have higher probability of being chosen, and agents with a worse one - have smaller probability. There is no guarantee that agent with the best evaluation of all available will be chosen in probabilistic strategies.

IMPORTANT NOTICE - probabilistic selectors behave best when fitness values consist of only positive or only negative numbers (excluding zeros). If the solution evaluator can output both positive and negative fitnesses - consider using non-probabilistic selectors for more accurate selection, as the probabilistic ones tend to have rather uniform probability distribution in such situations.

Enum Constant Summary

Enum Constants

Enum Constant and Description
HIGHEST_FITNESS
HIGHEST_FITNESS_PROBABILISTIC
LOWEST_FITNESS
LOWEST_FITNESS_PROBABILISTIC
RANDOM

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.function.BiFunction<io.vavr.collection.List<EmasAgent>,java.lang.Integer,io.vavr.collection.List<EmasAgent>>	selector

Method Summary

Modifier and Type	Method and Description
java.util.function.BiFunction<io.vavr.collection.List<EmasAgent>,java.lang.Integer,io.vavr.collection.List<EmasAgent>>	selector()
static MigrationStrategy	valueOf(java.lang.String name) Returns the enum constant of this type with the specified name.
static MigrationStrategy[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

RANDOM

public static final MigrationStrategy RANDOM

HIGHEST_FITNESS

public static final MigrationStrategy HIGHEST_FITNESS

HIGHEST_FITNESS_PROBABILISTIC

public static final MigrationStrategy HIGHEST_FITNESS_PROBABILISTIC

LOWEST_FITNESS

public static final MigrationStrategy LOWEST_FITNESS

LOWEST_FITNESS_PROBABILISTIC

public static final MigrationStrategy LOWEST_FITNESS_PROBABILISTIC

Field Detail

selector

private final java.util.function.BiFunction<io.vavr.collection.List<EmasAgent>,java.lang.Integer,io.vavr.collection.List<EmasAgent>> selector

Method Detail

values

public static MigrationStrategy[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (MigrationStrategy c : MigrationStrategy.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static MigrationStrategy valueOf(java.lang.String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

java.lang.IllegalArgumentException - if this enum type has no constant with the specified name

java.lang.NullPointerException - if the argument is null

selector

public java.util.function.BiFunction<io.vavr.collection.List<EmasAgent>,java.lang.Integer,io.vavr.collection.List<EmasAgent>> selector()