org.jgap.audit
Class FitnessImprovementMonitor

java.lang.Object
  org.jgap.audit.FitnessImprovementMonitor

All Implemented Interfaces:

IEvolutionMonitor

public class FitnessImprovementMonitor
extends java.lang.Object
implements IEvolutionMonitor

Monitors the evolution and stops it if evolution does not make a progress as desired.

Since:

3.4.4

Constructor Summary

FitnessImprovementMonitor(int a_initialWaitSeconds, int a_checkIntervalSeconds, double a_improvedFitnessExpected)
Constructor.

Method Summary

boolean	nextCycle(Population a_pop, java.util.List<java.lang.String> a_messages) Called after another evolution cycle has been executed.
void	start(Configuration a_config) Called just before the evolution starts.

Methods inherited from class java.lang.Object

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

Constructor Detail

FitnessImprovementMonitor

public FitnessImprovementMonitor(int a_initialWaitSeconds,
                                 int a_checkIntervalSeconds,
                                 double a_improvedFitnessExpected)

Constructor.

Parameters:

a_initialWaitSeconds - number of seconds to wait until first check

a_checkIntervalSeconds - number of seconds to wait after the previous check (except for the first check, where a_initialWaitSeconds is taken)

a_improvedFitnessExpected - number of fitness units the current best solution evolved is better than the best solution from the previously check

Since:

3.4.4

Method Detail

nextCycle

public boolean nextCycle(Population a_pop,
                         java.util.List<java.lang.String> a_messages)

Called after another evolution cycle has been executed.

Specified by:

nextCycle in interface IEvolutionMonitor

Parameters:

a_pop - the currently evolved population

a_messages - the monitor can append messages here to indicate why it asks evolution to stop

Returns:

true: continue with the evolution; false: stop evolution

Since:

3.4.4

start

public void start(Configuration a_config)

Called just before the evolution starts.

Specified by:

start in interface IEvolutionMonitor

Parameters:

a_config - the configuration used

Since:

3.4.4