org.jgap.audit

Class EvolutionMonitor

java.lang.Object

org.jgap.audit.EvolutionMonitor

All Implemented Interfaces:

java.io.Serializable, IEvolutionMonitor

public class EvolutionMonitor
extends java.lang.Object
implements IEvolutionMonitor

Monitors the evolution progress extensively. Keeps track of the population development for each single generation during the whole evolution process. Monitors chromosomes as well as genes. For each chromosome the originating chromosome is monitored (applies for natural selectors as well as for genetic operators that transform a single chromosome, like MutationOperator). For more complex genetic operators, like CrossoverOperator, all originating chromosomes are monitored (in crossover there are two). For genes an analogue monitoring is supported as for chromosomes. TO ACTIVATE MONITORING: Configuration.setMonitor(new EvolutionMonitor()); Each chromosome and gene itself has a unique ID. This ID is set by method setUniqueID. A unique ID is a String value that, in best case, is unique worldwide. A chromosome's or gene's originator is set by method setUniqueIDTemplate. This method accepts an index, as there could be more than one originator (see below). -------------------------------------------------------------------------- To give a better view, here are the population snapshots that are taken during a single evolution generation (chromosomes are given by *,+,-,.): |-------| |-------| |-------| |-------| |-------| | ** * | | ** | | * | | + | | + | |* * * | => |* * * | => |* * | => |* - | => |* . | | * ** | | ** | | ** | | ** | | -* | |-------| |-------| |-------| |-------| |-------| Update Natural Natural Genetic Genetic Chromosomes Selector 1 Selector i Operator 1 Operator j (Fitness calc.) |-------| |-------| |-------| |-------| |-------| | + | | + | | +** | | +** | | + * | => |* . | => |* . | => |* . | => |* * . | => |* * . | | -* | | -* | |* -* | |* -* | |* - | |-------| |-------| |-------| |-------| |-------| Bulk Fitness Update Add new Re-add Natural Function Chromosomes Chromosomes Fittest Selector k (optional) Chromosome (Post-Sel.) |-------| | + * | => |* * . | |* - | |-------| End of cycle For each single evolution cycle, these population states are kept separately. -------------------------------------------------------------------------- For each chromosome the originating chromosomes are tracked. Here are examples: Natural Selection, e.g. WeightedRouletteSelector: Chromosome 4715 has originator Chromosome 4711 (different ID because of cloning) Genetic Operation, e.g. MutationOperator: Chromosome 5512 has originator Chromosome 1139 Genetic Operation, e.g. CrossoverOperator: Chromosome 7119 has originator Chromosomes 807 and 5703 Chromosome 7120 has originator Chromosomes 807 and 5703 => two resulting Chromosomes have the same originators! Genetic, Operation, e.g. YourOperator: There can be as many originating Chromosomes as your operator regards -------------------------------------------------------------------------- For each gene the originating genes are tracked. Examples: Natural Selection, e.g. WeightedRouletteSelector: All Genes in Chromosome 4711 have the same originating genes as Chromosome 4711's originating Chromosome's genes. => Chromosome is selected only, not modified, thus the Genes stick to the Chromosome they belong to. Genes unique ID of template is not set. Genetic Operation, e.g. MutationOperator: Each mutated Gene originates from exactly one other Gene Genetic Operation, e.g. CrossoverOperator: Each crossed over Gene A has one originating Gene B. In turn, Gene B has one originating Gene A, as their alleles are swapped. All uncrossed Genes have the same originator as the Chromosome they belong to, thus their unique ID of template is not set. Genetic, Operation, e.g. YourOperator: A Gene could virtually have any number of originators.

Since:

3.5

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static int	CONTEXT_AFTER_BULK_EVALUATION
static int	CONTEXT_END_OF_CYCLE
static int	CONTEXT_NEW_CHROMOSOME
static int	CONTEXT_OFFSET_AFTER_OPERATE
static int	CONTEXT_OFFSET_NATURAL_SELECTOR1
static int	CONTEXT_OFFSET_NATURAL_SELECTOR2
static int	CONTEXT_READD_FITTEST
static int	CONTEXT_UPDATE_CHROMOSOMES1
static int	CONTEXT_UPDATE_CHROMOSOMES2

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
EvolutionMonitor()

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

Field Detail

CONTEXT_UPDATE_CHROMOSOMES1

public static final int CONTEXT_UPDATE_CHROMOSOMES1

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Constant Field Values

CONTEXT_OFFSET_NATURAL_SELECTOR1

public static final int CONTEXT_OFFSET_NATURAL_SELECTOR1

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Constant Field Values

CONTEXT_OFFSET_AFTER_OPERATE

public static final int CONTEXT_OFFSET_AFTER_OPERATE

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Constant Field Values

CONTEXT_AFTER_BULK_EVALUATION

public static final int CONTEXT_AFTER_BULK_EVALUATION

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Constant Field Values

CONTEXT_UPDATE_CHROMOSOMES2

public static final int CONTEXT_UPDATE_CHROMOSOMES2

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Constant Field Values

CONTEXT_NEW_CHROMOSOME

public static final int CONTEXT_NEW_CHROMOSOME

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Constant Field Values

CONTEXT_READD_FITTEST

public static final int CONTEXT_READD_FITTEST

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Constant Field Values

CONTEXT_OFFSET_NATURAL_SELECTOR2

public static final int CONTEXT_OFFSET_NATURAL_SELECTOR2

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Constant Field Values

CONTEXT_END_OF_CYCLE

public static final int CONTEXT_END_OF_CYCLE

See Also:

Constant Field Values

Constructor Detail

EvolutionMonitor

public EvolutionMonitor()

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:

3.5

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:

the gathered monitoring data