Package org.moeaframework.core.penalty

Class SumOfConstraintsPenaltyFunction

java.lang.Object

org.moeaframework.core.penalty.SumOfConstraintsPenaltyFunction

All Implemented Interfaces:

PenaltyFunction

public class SumOfConstraintsPenaltyFunction
extends Object
implements PenaltyFunction

Penalty function based on a fixed offset plus the sum of constraint violations.

Constructor Summary

Constructors

Constructor	Description
SumOfConstraintsPenaltyFunction()	Constructs a new penalty function based on the sum of constraint violations.
SumOfConstraintsPenaltyFunction(double offset)	Constructs a new penalty function based on the sum of constraint violations.

Method Summary

Modifier and Type	Method	Description
double	calculate(Solution solution)	Calculates the penalty for the given solution.
double	getOffset()	Returns the base penalty applied to all infeasible solutions.
void	setOffset(double offset)	Sets the base penalty applied to all infeasible solutions.

Methods inherited from class java.lang.Object

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

Constructor Details

SumOfConstraintsPenaltyFunction

public SumOfConstraintsPenaltyFunction()

Constructs a new penalty function based on the sum of constraint violations.

SumOfConstraintsPenaltyFunction

public SumOfConstraintsPenaltyFunction(double offset)

Constructs a new penalty function based on the sum of constraint violations.

Parameters:

offset - the base offset applied to all penalties

Method Details

setOffset

public void setOffset(double offset)

Sets the base penalty applied to all infeasible solutions.

Parameters:

offset - the base offset applied to all penalties

getOffset

public double getOffset()

Returns the base penalty applied to all infeasible solutions.

Returns:

the base offset applied to all penalties

calculate

public double calculate(Solution solution)

Description copied from interface: PenaltyFunction

Calculates the penalty for the given solution. In addition to returning the value to the caller, this method also sets the Penalty attribute on the solution.

Calling this method does not alter the objectives or constraints of the solution. It is the responsibility of the caller to use the penalty value, such as during selection. We encourage implementations to return a value of 0.0 for feasible solutions and > 0.0 for solutions violating constraints.

Specified by:

calculate in interface PenaltyFunction

Parameters:

solution - the solution

Returns:

the penalty for the solution