Package org.moeaframework.core.operator.program

Class PointMutation

java.lang.Object

org.moeaframework.core.operator.program.PointMutation

All Implemented Interfaces:

Configurable, Mutation, Variation

public class PointMutation
extends Object
implements Mutation

Mutates a program by randomly selecting nodes in the expression tree and replacing the node with a new, compatible, randomly-selected node.

This operator is type-safe.

Constructor Summary

Constructors

Constructor	Description
PointMutation()	Constructs a new point mutation operator with the default settings.
PointMutation(double probability)	Constructs a new point mutation operator.

Method Summary

Modifier and Type	Method	Description
String	getName()	Returns the name of this variation operator.
double	getProbability()	Gets the probability of mutating a node in the tree.
Solution	mutate(Solution parent)	Mutates the given parent to produce an offspring.
protected void	mutate(Node node, Rules rules)	Applies point mutation to the specified node.
void	setProbability(double probability)	Sets the probability of mutating a node in the tree.

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

PointMutation

public PointMutation()

Constructs a new point mutation operator with the default settings.

PointMutation

public PointMutation(double probability)

Constructs a new point mutation operator.

Parameters:

probability - the probability of mutating a node in the tree

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

getProbability

public double getProbability()

Gets the probability of mutating a node in the tree.

Returns:

the probability

setProbability

public void setProbability(double probability)

Sets the probability of mutating a node in the tree.

Parameters:

probability - the probability (0.0 - 1.0)

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

mutate

protected void mutate(Node node,
 Rules rules)

Applies point mutation to the specified node.

Parameters:

node - the node undergoing point mutation

rules - the rules defining the program syntax