Package org.moeaframework.core.fitness

Class IndicatorFitnessEvaluator

java.lang.Object

org.moeaframework.core.fitness.IndicatorFitnessEvaluator

All Implemented Interfaces:

FitnessEvaluator

Direct Known Subclasses:

AdditiveEpsilonIndicatorFitnessEvaluator, HypervolumeFitnessEvaluator

public abstract class IndicatorFitnessEvaluator
extends Object
implements FitnessEvaluator

Abstract class for assigning fitness based on a binary indicator. This class combines the pair-wise fitness of each solution into an aggregate fitness within the entire population.

Constructor Summary

Constructors

Constructor	Description
IndicatorFitnessEvaluator(Problem problem)	Constructs an indicator-based fitness for the specified problem.

Method Summary

Modifier and Type	Method	Description
protected abstract double	calculateIndicator(Solution solution1, Solution solution2)	Returns the indicator value relative to the two solutions.
void	evaluate(Population population)	Evaluates the fitness of solutions in the population, updating the Fitness attribute.
Problem	getProblem()	Returns the problem.
void	removeAndUpdate(Population population, int removeIndex)	After calling evaluate(Population), this method is used to iteratively remove solutions from the population while updating the fitness value.

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.fitness.FitnessEvaluator

areLargerValuesPreferred

Constructor Details

IndicatorFitnessEvaluator

public IndicatorFitnessEvaluator(Problem problem)

Constructs an indicator-based fitness for the specified problem.

Parameters:

problem - the problem

Method Details

getProblem

public Problem getProblem()

Returns the problem.

Returns:

the problem

evaluate

public void evaluate(Population population)

Description copied from interface: FitnessEvaluator

Evaluates the fitness of solutions in the population, updating the Fitness attribute.

Specified by:

evaluate in interface FitnessEvaluator

Parameters:

population - the population to be evaluated

removeAndUpdate

public void removeAndUpdate(Population population,
 int removeIndex)

After calling evaluate(Population), this method is used to iteratively remove solutions from the population while updating the fitness value. There must be no other modifications to the population between invocations of evaluate(Population) and this method other than removing solutions using this method.

Parameters:

population - the population

removeIndex - the index to remove

calculateIndicator

protected abstract double calculateIndicator(Solution solution1,
 Solution solution2)

Returns the indicator value relative to the two solutions.

Parameters:

solution1 - the first solution

solution2 - the second solution

Returns:

the indicator value relative to the two solutions