Package org.opt4j.common.logger

Class TsvLogger

java.lang.Object

org.opt4j.common.logger.AbstractLogger

org.opt4j.common.logger.TsvLogger

All Implemented Interfaces:

Logger, IndividualStateListener, OptimizerIterationListener, OptimizerStateListener

public class TsvLogger
extends AbstractLogger
implements Logger

The TsvLogger writes all Individuals from the Archive to the specified file. It can be configured to write the data each iterationStep iterations or each evaluationStep evaluations. The file format is TSV (tab separated values), according to the Definition of tab-separated-values (tsv) by IANA.

Field Summary

Fields

Modifier and Type	Field	Description
protected final Archive	archive

Fields inherited from class org.opt4j.common.logger.AbstractLogger

evaluationCount, evaluationCountLast, evaluationStep, isFirst, iterationStep

Constructor Summary

Constructors

Constructor	Description
TsvLogger(Archive archive, String filename, int evaluationStep, int iterationStep)	Creates an TsvLogger.

Method Summary

Modifier and Type	Method	Description
protected String	getColumnDelimiter()	The String separating two columns.
protected String	getCommentDelimiter()	The String starting a line comment.
protected String	getIndividual(Individual individual)	Creates a String representation of the given Individual.
protected String	getStatistics(int iteration, int evaluation, double time)	Statistics for the given iteration and evaluation.
protected PrintWriter	initWriter(String filename)	Initialize the print write from a filename
void	logEvent(int iteration, int evaluation)	Callback method called if the specific number of iterations or evaluations is reached.
void	logHeader(Collection<Objective> objectives)	Writes the header.
void	optimizationStarted()	Callback method invoked once the optimization starts.
void	optimizationStopped()	Callback method invoked once the optimization stops.

Methods inherited from class org.opt4j.common.logger.AbstractLogger

inidividualStateChanged, iterationComplete, optimizationStarted, optimizationStopped

Methods inherited from class java.lang.Object

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

Field Details

archive

protected final Archive archive

Constructor Details

TsvLogger

@Inject
public TsvLogger(Archive archive,
 String filename,
 int evaluationStep,
 int iterationStep)

Creates an TsvLogger.

Parameters:

archive - the archive

filename - the filename (using namespace TsvLogger)

evaluationStep - the number of evaluations between two logging events (using namespace TsvLogger)

iterationStep - the number of iterations between two logging events (using namespace TsvLogger)

Method Details

initWriter

protected PrintWriter initWriter(String filename)

Initialize the print write from a filename

Parameters:

filename - the filename

Returns:

the print writer

optimizationStarted

public void optimizationStarted()

Description copied from class: AbstractLogger

Callback method invoked once the optimization starts.

Specified by:

optimizationStarted in class AbstractLogger

logEvent

public void logEvent(int iteration,
 int evaluation)

Description copied from class: AbstractLogger

Callback method called if the specific number of iterations or evaluations is reached.

Specified by:

logEvent in class AbstractLogger

Parameters:

iteration - the current iteration number

evaluation - the current evaluation number

optimizationStopped

public void optimizationStopped()

Description copied from class: AbstractLogger

Callback method invoked once the optimization stops.

Specified by:

optimizationStopped in class AbstractLogger

logHeader

public void logHeader(Collection<Objective> objectives)

Description copied from class: AbstractLogger

Writes the header.

Specified by:

logHeader in class AbstractLogger

Parameters:

objectives - a collection of objectives

getColumnDelimiter

protected String getColumnDelimiter()

The String separating two columns. The tab character ("\t") is the default, which leads to a tab separated values file format (TSV).

Returns:

the delimiter

getIndividual

protected String getIndividual(Individual individual)

Creates a String representation of the given Individual. Per default, the Values of all Objectives of the individual, separated by getColumnDelimiter(), are returned. The String representation of a Value must not contain the tab character.

Parameters:

individual - the individual

Returns:

the corresponding string

getStatistics

protected String getStatistics(int iteration,
 int evaluation,
 double time)

Statistics for the given iteration and evaluation. Per default, the iteration, the number of evaluations and the optimization run time in milliseconds, separated by getColumnDelimiter(), are returned.

Parameters:

iteration - the current iteration

evaluation - the current number of evaluations

time - the current runtime of the optimization

Returns:

the corresponding string

getCommentDelimiter

protected String getCommentDelimiter()

The String starting a line comment. Default is the empty String ("") according to the TSV specification.

Returns:

the comment delimiter