org.opt4j.optimizer.ea

Class Normalizer

java.lang.Object

org.opt4j.optimizer.ea.Normalizer

All Implemented Interfaces:

IndividualStateListener

public class Normalizer
extends Object
implements IndividualStateListener

The Normalizer can be used to normalize Objectives.

Author:

reimann

Constructor Summary

Constructors

Constructor and Description
Normalizer()

Method Summary

Modifier and Type	Method and Description
void	inidividualStateChanged(Individual individual) Invoked if the Individual changes its state.
Objectives	normalize(Objectives objectives) Returns normalized objectives.
static double	toMinProblem(Objective objective, Value<?> value) Transforms the the Objective to a minimization objective, i.e.

Methods inherited from class java.lang.Object

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

Constructor Detail

Normalizer

public Normalizer()

Method Detail

normalize

public Objectives normalize(Objectives objectives)

Returns normalized objectives. Each objective is in the range between 0 and 1 and has to be minimized. Here, 0 is the smallest value seen so far for this objective for all evaluated Individuals and 1 the biggest value, respectively. If an objective is infeasible, it is set to 1.

Parameters:

objectives - the objectives to normalize

Returns:

the normalized objectives

inidividualStateChanged

public void inidividualStateChanged(Individual individual)

Description copied from interface: IndividualStateListener

Invoked if the Individual changes its state.

Specified by:

inidividualStateChanged in interface IndividualStateListener

Parameters:

individual - the individual that changes the state

toMinProblem

public static final double toMinProblem(Objective objective,
                                        Value<?> value)

Transforms the the Objective to a minimization objective, i.e. if the given objective is to be maximized, the negation of the given value is returned.

Parameters:

objective - the respective objective

value - the value to transform

Returns:

the corresponding double value