ec.evolve

Class RandomRestarts

java.lang.Object

ec.Statistics

ec.evolve.RandomRestarts

All Implemented Interfaces:

Setup, Singleton, Serializable

public class RandomRestarts
extends Statistics

A special Statistics class which performs random restarts on the population, effectively reininitializing the population and starting over again. RandomRestarts has two ways of determining when to perform a restart. If the restart type is "fixed", then the restart will occur precisely when the generation is a multiple of restart-upper-bound, minus one. (That's hardly random, of course). If the restart type is "random", then at the beginning of the run, and after every restart, a new restart is chosen randomly from one to restart-upper-bound.

This class is compatible with populations which load from files -- it temporarily disables the load-from-file feature when telling the population to populate itself again, forcing the population to do so by creating random individuals.

Author:

James O'Beirne

Parameters

base.start int >= 0 (default = 1)	The first generation where the clock may be started.
base.restart-type random (default) or fixed	Either initiates clock at a random value or a fixed one.
base.restart-upper-bound 1 < int < \inf	Maximum time clock can initiate with.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
int	countdown
static String	P_RESTART_TYPE
static String	P_RESTART_UPPERBOUND
static String	P_START
(package private) String	restartType
int	start
int	upperbound

Fields inherited from class ec.Statistics

children, P_CHILD, P_MUZZLE, P_NUMCHILDREN, P_SILENT, P_SILENT_FILE, P_SILENT_PRINT, silentFile, silentPrint

Constructor Summary

Constructors

Constructor and Description
RandomRestarts()

Method Summary

Methods

Modifier and Type	Method and Description
(package private) void	possiblyRestart(EvolutionState state)
void	preEvaluationStatistics(EvolutionState state) Checks the clock; if it's time to restart, we repopulate the population.
(package private) void	resetClock(EvolutionState state)
void	setup(EvolutionState state, Parameter base) Gets the clock ticking.

Methods inherited from class ec.Statistics

enteringInitialPopulationStatistics, enteringSteadyStateStatistics, finalStatistics, generationBoundaryStatistics, individualsBredStatistics, individualsEvaluatedStatistics, postBreedingStatistics, postCheckpointStatistics, postEvaluationStatistics, postInitializationStatistics, postPostBreedingExchangeStatistics, postPreBreedingExchangeStatistics, preBreedingStatistics, preCheckpointStatistics, preInitializationStatistics, prePostBreedingExchangeStatistics, prePreBreedingExchangeStatistics

Methods inherited from class java.lang.Object

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

Field Detail

P_RESTART_TYPE

public static final String P_RESTART_TYPE

See Also:

Constant Field Values

P_RESTART_UPPERBOUND

public static final String P_RESTART_UPPERBOUND

See Also:

Constant Field Values

P_START

public static final String P_START

See Also:

Constant Field Values

countdown

public int countdown

upperbound

public int upperbound

start

public int start

restartType

String restartType

Constructor Detail

RandomRestarts

public RandomRestarts()

Method Detail

setup

public void setup(EvolutionState state,
         Parameter base)

Gets the clock ticking.

Specified by:

setup in interface Setup

Overrides:

setup in class Statistics

preEvaluationStatistics

public void preEvaluationStatistics(EvolutionState state)

Checks the clock; if it's time to restart, we repopulate the population. Afterwards, we reset the clock. If it's not time yet, the clock goes tick.

Overrides:

preEvaluationStatistics in class Statistics

possiblyRestart

void possiblyRestart(EvolutionState state)

resetClock

void resetClock(EvolutionState state)