org.jgap.audit

Class FitnessImprovementMonitor

java.lang.Object

org.jgap.audit.FitnessImprovementMonitor

All Implemented Interfaces:

java.io.Serializable, 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. For usage of this monitor class, see class examples.audit.EvolutionMonitorExample.

Since:

3.4.4

See Also:

Serialized Form

Field Summary

Fields inherited from interface org.jgap.audit.IEvolutionMonitor

MONITOR_EVENT_AFTER_BULK_EVAL, MONITOR_EVENT_AFTER_OPERATE, MONITOR_EVENT_AFTER_SELECT, MONITOR_EVENT_AFTER_UPDATE_CHROMOSOMES1, MONITOR_EVENT_AFTER_UPDATE_CHROMOSOMES2, MONITOR_EVENT_BEFORE_ADD_CHROMOSOME, MONITOR_EVENT_BEFORE_BULK_EVAL, MONITOR_EVENT_BEFORE_OPERATE, MONITOR_EVENT_BEFORE_SELECT, MONITOR_EVENT_BEFORE_UPDATE_CHROMOSOMES1, MONITOR_EVENT_BEFORE_UPDATE_CHROMOSOMES2, MONITOR_EVENT_READD_FITTEST, MONITOR_EVENT_REMOVE_CHROMOSOME

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
void	event(java.lang.String a_monitorEvent, int a_evolutionNo, java.lang.Object[] a_information) Called whenever it's worth monitoring.
PopulationHistoryIndexed	getPopulations()
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

equals, 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 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

event

public void event(java.lang.String a_monitorEvent,
                  int a_evolutionNo,
                  java.lang.Object[] a_information)

Called whenever it's worth monitoring.

Specified by:

event in interface IEvolutionMonitor

Parameters:

a_monitorEvent - see constants at top of class IEvolutionMonitor

a_evolutionNo - the index of the evolution round (1, 2, ...)

a_information - event-specific information

Since:

3.5

getPopulations

public PopulationHistoryIndexed getPopulations()

Specified by:

getPopulations in interface IEvolutionMonitor

Returns:

null as no data is gathered by this monitor

Since:

3.5