moa.evaluation

Class EWMAClassificationPerformanceEvaluator

java.lang.Object

moa.AbstractMOAObject

moa.options.AbstractOptionHandler

moa.evaluation.EWMAClassificationPerformanceEvaluator

All Implemented Interfaces:

Serializable, ClassificationPerformanceEvaluator, MOAObject, OptionHandler

public class EWMAClassificationPerformanceEvaluator
extends AbstractOptionHandler
implements ClassificationPerformanceEvaluator

Classification evaluator that updates evaluation results using an Exponential Weighted Moving Average.

Version:

$Revision: 7 $

Author:

Albert Bifet (abifet at cs dot waikato dot ac dot nz)

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	EWMAClassificationPerformanceEvaluator.Estimator

Field Summary

Fields

Modifier and Type	Field and Description
FloatOption	alphaOption
protected double	TotalweightObserved
protected EWMAClassificationPerformanceEvaluator.Estimator	weightCorrect

Fields inherited from class moa.options.AbstractOptionHandler

classOptionNamesToPreparedObjects, options

Constructor Summary

Constructors

Constructor and Description
EWMAClassificationPerformanceEvaluator()

Method Summary

Methods

Modifier and Type	Method and Description
void	addResult(weka.core.Instance inst, double[] classVotes) Adds a learning result to this evaluator.
void	getDescription(StringBuilder sb, int indent) Returns a string representation of this object.
double	getFractionCorrectlyClassified()
double	getFractionIncorrectlyClassified()
Measurement[]	getPerformanceMeasurements() Gets the current measurements monitored by this evaluator.
double	getTotalWeightObserved()
void	prepareForUseImpl(TaskMonitor monitor, ObjectRepository repository) This method describes the implementation of how to prepare this object for use.
void	reset() Resets this evaluator.

Methods inherited from class moa.options.AbstractOptionHandler

copy, discoverOptionsViaReflection, getCLICreationString, getOptions, getPreparedClassOption, getPreparedClassOption, getPurposeString, prepareClassOptions, prepareForUse, prepareForUse

Methods inherited from class moa.AbstractMOAObject

copy, measureByteSize, measureByteSize, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface moa.MOAObject

copy, measureByteSize

Field Detail

TotalweightObserved

protected double TotalweightObserved

alphaOption

public FloatOption alphaOption

weightCorrect

protected EWMAClassificationPerformanceEvaluator.Estimator weightCorrect

Constructor Detail

EWMAClassificationPerformanceEvaluator

public EWMAClassificationPerformanceEvaluator()

Method Detail

reset

public void reset()

Description copied from interface: ClassificationPerformanceEvaluator

Resets this evaluator. It must be similar to starting a new evaluator from scratch.

Specified by:

reset in interface ClassificationPerformanceEvaluator

addResult

public void addResult(weka.core.Instance inst,
             double[] classVotes)

Description copied from interface: ClassificationPerformanceEvaluator

Adds a learning result to this evaluator.

Specified by:

addResult in interface ClassificationPerformanceEvaluator

Parameters:

inst - the instance to be classified

classVotes - an array containing the estimated membership probabilities of the test instance in each class

getPerformanceMeasurements

public Measurement[] getPerformanceMeasurements()

Description copied from interface: ClassificationPerformanceEvaluator

Gets the current measurements monitored by this evaluator.

Specified by:

getPerformanceMeasurements in interface ClassificationPerformanceEvaluator

Returns:

an array of measurements monitored by this evaluator

getTotalWeightObserved

public double getTotalWeightObserved()

getFractionCorrectlyClassified

public double getFractionCorrectlyClassified()

getFractionIncorrectlyClassified

public double getFractionIncorrectlyClassified()

getDescription

public void getDescription(StringBuilder sb,
                  int indent)

Description copied from interface: MOAObject

Returns a string representation of this object. Used in AbstractMOAObject.toString to give a string representation of the object.

Specified by:

getDescription in interface MOAObject

Parameters:

sb - the stringbuilder to add the description

indent - the number of characters to indent

prepareForUseImpl

public void prepareForUseImpl(TaskMonitor monitor,
                     ObjectRepository repository)

Description copied from class: AbstractOptionHandler

This method describes the implementation of how to prepare this object for use. All classes that extends this class have to implement prepareForUseImpl and not prepareForUse since prepareForUse calls prepareForUseImpl.

Specified by:

prepareForUseImpl in class AbstractOptionHandler

Parameters:

monitor - the TaskMonitor to use

repository - the ObjectRepository to use