meka.classifiers.multilabel.meta

Class EM

java.lang.Object

weka.classifiers.AbstractClassifier

weka.classifiers.SingleClassifierEnhancer

meka.classifiers.multilabel.ProblemTransformationMethod

meka.classifiers.multilabel.meta.EM

All Implemented Interfaces:

Serializable, Cloneable, MultiLabelClassifier, SemisupervisedClassifier, weka.classifiers.Classifier, weka.core.BatchPredictor, weka.core.CapabilitiesHandler, weka.core.CapabilitiesIgnorer, weka.core.CommandlineRunnable, weka.core.OptionHandler, weka.core.RevisionHandler, weka.core.TechnicalInformationHandler

Direct Known Subclasses:

CM

public class EM
extends ProblemTransformationMethod
implements SemisupervisedClassifier, weka.core.TechnicalInformationHandler

EM.java - Expectation Maximization using any multi-label classifier. A specified multi-label classifier is built on the training data. This model is then used to classify the test data. The confidence with which instances are classified is used to reweight them. This data is then used to retrain the classifier. This cycle continues ('EM'-style) for I iterations. The final model is used to officially classifier the test data.
Because of the weighting, it is advised to use a classifier which gives good confidence (probabalistic) outputs.

Version:

2010

Author:

Jesse Read

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected weka.core.Instances	D_
protected int	m_I

Fields inherited from class meka.classifiers.multilabel.ProblemTransformationMethod

m_InstancesTemplate

Fields inherited from class weka.classifiers.SingleClassifierEnhancer

m_Classifier

Fields inherited from class weka.classifiers.AbstractClassifier

BATCH_SIZE_DEFAULT, m_BatchSize, m_Debug, m_DoNotCheckCapabilities, m_numDecimalPlaces, NUM_DECIMAL_PLACES_DEFAULT

Constructor Summary

Constructors

Constructor and Description
EM()

Method Summary

Modifier and Type	Method and Description
void	buildClassifier(weka.core.Instances D)
protected String	defaultClassifierString()
double[]	distributionForInstance(weka.core.Instance x)
int	getIterations()
String[]	getOptions()
String	getRevision()
weka.core.TechnicalInformation	getTechnicalInformation()
String	globalInfo() Description to display in the GUI.
void	introduceUnlabelledData(weka.core.Instances D) Set Unlabelled Data - provide unlabelled data prior to calling buildClassifier(Instances).
String	iterationsTipText()
Enumeration	listOptions()
static void	main(String[] args)
void	setIterations(int i)
void	setOptions(String[] options)
protected void	updateWeights(ProblemTransformationMethod h, weka.core.Instances D)

Methods inherited from class meka.classifiers.multilabel.ProblemTransformationMethod

evaluation, getCapabilities, getModel, getTemplate, makeCopies, runClassifier, testCapabilities, toString

Methods inherited from class weka.classifiers.SingleClassifierEnhancer

classifierTipText, defaultClassifierOptions, getClassifier, getClassifierSpec, postExecution, preExecution, setClassifier

Methods inherited from class weka.classifiers.AbstractClassifier

batchSizeTipText, classifyInstance, debugTipText, distributionsForInstances, doNotCheckCapabilitiesTipText, forName, getBatchSize, getDebug, getDoNotCheckCapabilities, getNumDecimalPlaces, implementsMoreEfficientBatchPrediction, makeCopies, makeCopy, numDecimalPlacesTipText, run, runClassifier, setBatchSize, setDebug, setDoNotCheckCapabilities, setNumDecimalPlaces

Methods inherited from class java.lang.Object

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

Methods inherited from interface meka.classifiers.multilabel.MultiLabelClassifier

debugTipText, getDebug, getModel, setDebug

Methods inherited from interface weka.classifiers.Classifier

classifyInstance, getCapabilities

Field Detail

m_I

protected int m_I

D_

protected weka.core.Instances D_

Constructor Detail

EM

public EM()

Method Detail

defaultClassifierString

protected String defaultClassifierString()

Overrides:

defaultClassifierString in class ProblemTransformationMethod

introduceUnlabelledData

public void introduceUnlabelledData(weka.core.Instances D)

Description copied from interface: SemisupervisedClassifier

Set Unlabelled Data - provide unlabelled data prior to calling buildClassifier(Instances).

Specified by:

introduceUnlabelledData in interface SemisupervisedClassifier

Parameters:

D - Instances for which the true class labels are not available for each instance.

globalInfo

public String globalInfo()

Description copied from class: ProblemTransformationMethod

Description to display in the GUI.

Overrides:

globalInfo in class ProblemTransformationMethod

Returns:

the description

buildClassifier

public void buildClassifier(weka.core.Instances D)
                     throws Exception

Specified by:

buildClassifier in interface weka.classifiers.Classifier

Specified by:

buildClassifier in class ProblemTransformationMethod

Throws:

Exception

updateWeights

protected void updateWeights(ProblemTransformationMethod h,
                             weka.core.Instances D)
                      throws Exception

Throws:

Exception

distributionForInstance

public double[] distributionForInstance(weka.core.Instance x)
                                 throws Exception

Specified by:

distributionForInstance in interface weka.classifiers.Classifier

Specified by:

distributionForInstance in class ProblemTransformationMethod

Throws:

Exception

setIterations

public void setIterations(int i)

getIterations

public int getIterations()

iterationsTipText

public String iterationsTipText()

listOptions

public Enumeration listOptions()

Specified by:

listOptions in interface weka.core.OptionHandler

Overrides:

listOptions in class weka.classifiers.SingleClassifierEnhancer

setOptions

public void setOptions(String[] options)
                throws Exception

Specified by:

setOptions in interface weka.core.OptionHandler

Overrides:

setOptions in class weka.classifiers.SingleClassifierEnhancer

Throws:

Exception

getOptions

public String[] getOptions()

Specified by:

getOptions in interface weka.core.OptionHandler

Overrides:

getOptions in class weka.classifiers.SingleClassifierEnhancer

getRevision

public String getRevision()

Specified by:

getRevision in interface weka.core.RevisionHandler

Overrides:

getRevision in class ProblemTransformationMethod

getTechnicalInformation

public weka.core.TechnicalInformation getTechnicalInformation()

Specified by:

getTechnicalInformation in interface weka.core.TechnicalInformationHandler

main

public static void main(String[] args)