Package org.moeaframework.core.operator.real

Class UM

java.lang.Object

org.moeaframework.core.operator.TypeSafeMutation<RealVariable>

org.moeaframework.core.operator.real.UM

All Implemented Interfaces:

Configurable, Mutation, Variation

public class UM
extends TypeSafeMutation<RealVariable>

Uniform mutation (UM) operator. Each decision variable is mutated by selecting a new value within its bounds uniformly at random. The figure below depicts the offspring distribution.

It is recommended each decision variable is mutated with a probability of 1 / L, where L is the number of decision variables. This results in one mutation per offspring on average.

This operator is type-safe.

Constructor Summary

Constructors

Constructor	Description
UM()	Constructs a uniform mutation operator with default settings.
UM(double probability)	Constructs a uniform mutation operator.

Method Summary

Modifier and Type	Method	Description
String	getName()	Returns the name of this variation operator.
void	mutate(RealVariable variable)	Mutates the specified variable using uniform mutation.

Methods inherited from class org.moeaframework.core.operator.TypeSafeMutation

getProbability, mutate, setProbability

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.moeaframework.core.configuration.Configurable

applyConfiguration, getConfiguration

Methods inherited from interface org.moeaframework.core.operator.Mutation

evolve, getArity

Constructor Details

UM

public UM()

Constructs a uniform mutation operator with default settings.

UM

public UM(double probability)

Constructs a uniform mutation operator.

Parameters:

probability - the probability of mutating each variable in a solution

Method Details

getName

public String getName()

Description copied from interface: Variation

Returns the name of this variation operator. This name should also be used as the prefix for any parameters. As such, the name should only contain alphanumeric characters, avoid using whitespace and other symbols.

Returns:

the name of this variation operator

mutate

public void mutate(RealVariable variable)

Mutates the specified variable using uniform mutation.

Specified by:

mutate in class TypeSafeMutation<RealVariable>

Parameters:

variable - the variable to be mutated