org.dllearner.algorithms

Class NaiveALLearner

java.lang.Object

org.dllearner.core.AbstractComponent

org.dllearner.core.AbstractCELA

org.dllearner.algorithms.NaiveALLearner

All Implemented Interfaces:

ClassExpressionLearningAlgorithm, Component, LearningAlgorithm, StoppableLearningAlgorithm

public class NaiveALLearner
extends AbstractCELA

Simple example learning algorithm exhaustively creating complex class expressions of the AL description logic.

Field Summary

Fields inherited from class org.dllearner.core.AbstractCELA

allowedConcepts, allowedDataProperties, allowedObjectProperties, baseURI, bestEvaluatedDescriptions, dataFactory, dfPercent, duplicator, ignoredConcepts, ignoredDataProperties, ignoredObjectProperties, isRunning, learningProblem, MAX_NR_OF_RESULTS, maxExecutionTimeInSeconds, minimizer, nanoStartTime, OWL_NOTHING, OWL_THING, prefixes, reasoner, renderer, stop

Fields inherited from class org.dllearner.core.AbstractComponent

initialized

Constructor Summary

Constructors

Constructor and Description
NaiveALLearner()
NaiveALLearner(AbstractClassExpressionLearningProblem lp, AbstractReasonerComponent reasoner)

Method Summary

Modifier and Type	Method and Description
org.semanticweb.owlapi.model.OWLClassExpression	getCurrentlyBestDescription()
EvaluatedDescription	getCurrentlyBestEvaluatedDescription() Returns the best descriptions obtained so far.
int	getMaxLength()
void	init() Method to be called after the component has been configured.
boolean	isRunning() Returns whether the learning algorithm is running.
void	setMaxLength(int length)
void	start() Starts the algorithm.
void	stop() Stops the algorithm gracefully.

Methods inherited from class org.dllearner.core.AbstractCELA

changeLearningProblem, changeReasonerComponent, descriptionToString, getAllowedConcepts, getAllowedDataProperties, getAllowedObjectProperties, getCurrentlyBestDescriptions, getCurrentlyBestDescriptions, getCurrentlyBestDescriptions, getCurrentlyBestEvaluatedDescriptions, getCurrentlyBestEvaluatedDescriptions, getCurrentlyBestEvaluatedDescriptions, getCurrentlyBestEvaluatedDescriptions, getCurrentlyBestMostGeneralEvaluatedDescriptions, getCurrentRuntimeInMilliSeconds, getDurationAsString, getIgnoredConcepts, getIgnoredDataProperties, getIgnoredObjectProperties, getLearningProblem, getMaxExecutionTimeInSeconds, getNiceDescription, getReasoner, getRemainingRuntimeInMilliseconds, getSolutionString, initClassHierarchy, initDataPropertyHierarchy, initObjectPropertyHierarchy, isTimeExpired, isUseMinimizer, rewrite, setAllowedConcepts, setAllowedDataProperties, setAllowedObjectProperties, setIgnoredConcepts, setIgnoredDataProperties, setIgnoredObjectProperties, setLearningProblem, setMaxExecutionTime, setMaxExecutionTimeInSeconds, setReasoner, setRenderer, setUseMinimizer, supportedLearningProblems

Methods inherited from class org.dllearner.core.AbstractComponent

isInitialized

Methods inherited from class java.lang.Object

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

Constructor Detail

NaiveALLearner

public NaiveALLearner()

NaiveALLearner

public NaiveALLearner(AbstractClassExpressionLearningProblem lp,
                      AbstractReasonerComponent reasoner)

Method Detail

start

public void start()

Description copied from interface: LearningAlgorithm

Starts the algorithm. It runs until paused, stopped, or a termination criterion has been reached.

init

public void init()
          throws ComponentInitException

Description copied from interface: Component

Method to be called after the component has been configured. Implementation of components can overwrite this method to perform setup and initialisation tasks for this component.

Throws:

ComponentInitException - This exception is thrown if any exceptions occur within the initialisation process of this component. As component developer, you are encouraged to re-throw occurring exception as ComponentInitException and giving an error message as well as the actually exception by using the constructor ComponentInitException.ComponentInitException(String, Throwable).

stop

public void stop()

Description copied from interface: StoppableLearningAlgorithm

Stops the algorithm gracefully. A stopped algorithm cannot be resumed anymore. Use this method for cleanup and freeing memory.

Specified by:

stop in interface StoppableLearningAlgorithm

Overrides:

stop in class AbstractCELA

isRunning

public boolean isRunning()

Description copied from interface: StoppableLearningAlgorithm

Returns whether the learning algorithm is running. Implementation should use a boolean status variable in their implementations of the start and resume methods.

Specified by:

isRunning in interface StoppableLearningAlgorithm

Overrides:

isRunning in class AbstractCELA

Returns:

True if the algorithm is running, false otherwise.

getCurrentlyBestDescription

public org.semanticweb.owlapi.model.OWLClassExpression getCurrentlyBestDescription()

Overrides:

getCurrentlyBestDescription in class AbstractCELA

Returns:

The best class OWLClassExpression found by the learning algorithm so far.

See Also:

AbstractCELA.getCurrentlyBestEvaluatedDescription()

getCurrentlyBestEvaluatedDescription

public EvaluatedDescription getCurrentlyBestEvaluatedDescription()

Description copied from class: AbstractCELA

Returns the best descriptions obtained so far.

Overrides:

getCurrentlyBestEvaluatedDescription in class AbstractCELA

Returns:

Best class class expression found so far.

setMaxLength

public void setMaxLength(int length)

getMaxLength

public int getMaxLength()