Package org.moeaframework.algorithm.single

Class SelfAdaptiveNormalVariation

java.lang.Object

org.moeaframework.algorithm.single.SelfAdaptiveNormalVariation

All Implemented Interfaces:

Configurable, Mutation, Variation

public class SelfAdaptiveNormalVariation
extends Object
implements Mutation

Self adaptive variation based on the normal distribution. The self adaptive parameter sigma is stored as the "sigma" attribute. Each call to Mutation.evolve(Solution[]) performs the following changes:

   sigma = sigma * e^(tau * N(0,1))
   vars = vars + sigma * N(0,I)
 

where N(0,1) and N(0,I) are normally-distributed random numbers with mean 0 and standard deviation 1.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	SIGMA	The attribute for storing the self adaptive parameter.

Constructor Summary

Constructors

Constructor	Description
SelfAdaptiveNormalVariation()	Constructs a new instance of the self-adaptive variation based on the normal distribution.

Method Summary

Modifier and Type	Method	Description
String	getName()	Returns the name of this variation operator.
Solution	mutate(Solution parent)	Mutates the given parent to produce an offspring.

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

Field Details

SIGMA

public static final String SIGMA

The attribute for storing the self adaptive parameter.

See Also:

• Constant Field Values

Constructor Details

SelfAdaptiveNormalVariation

public SelfAdaptiveNormalVariation()

Constructs a new instance of the self-adaptive variation based on the normal distribution.

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.

Specified by:

getName in interface Variation

Returns:

the name of this variation operator

mutate

public Solution mutate(Solution parent)

Description copied from interface: Mutation

Mutates the given parent to produce an offspring.

Specified by:

mutate in interface Mutation

Parameters:

parent - the parent solution

Returns:

the offspring