Package elki.datasource.filter.normalization.instancewise

Class InstanceMeanVarianceNormalization<V extends elki.data.NumberVector>

java.lang.Object

elki.datasource.filter.AbstractStreamFilter

elki.datasource.filter.AbstractStreamConversionFilter<I,O>

elki.datasource.filter.AbstractVectorStreamConversionFilter<V,V>

elki.datasource.filter.normalization.instancewise.InstanceMeanVarianceNormalization<V>

Type Parameters:

V - vector type

All Implemented Interfaces:

elki.datasource.bundle.BundleStreamSource, Normalization<V>, elki.datasource.filter.ObjectFilter, elki.datasource.filter.StreamFilter

public class InstanceMeanVarianceNormalization<V extends elki.data.NumberVector>
extends AbstractVectorStreamConversionFilter<V,V>
implements Normalization<V>

Normalize vectors such that they have zero mean and unit variance.

Since:

0.7.0

Author:

Erich Schubert

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	InstanceMeanVarianceNormalization.Par<V extends elki.data.NumberVector>	Parameterization class.

Nested classes/interfaces inherited from interface elki.datasource.bundle.BundleStreamSource

elki.datasource.bundle.BundleStreamSource.Event

Field Summary

Fields

Modifier and Type	Field	Description
private int	multiplicity	Multiplicity of the vector.

Fields inherited from class elki.datasource.filter.AbstractVectorStreamConversionFilter

factory

Fields inherited from class elki.datasource.filter.AbstractStreamFilter

source

Constructor Summary

Constructors

Constructor	Description
InstanceMeanVarianceNormalization()	Constructor.

Method Summary

Modifier and Type	Method	Description
protected elki.data.type.SimpleTypeInformation<? super V>	convertedType(elki.data.type.SimpleTypeInformation<V> in)	Get the output type from the input type after conversion.
protected V	filterSingleObject(V featureVector)	Normalize a single instance.
protected elki.data.type.SimpleTypeInformation<? super V>	getInputTypeRestriction()	Get the input type restriction used for negotiating the data query.
protected void	initializeOutputType(elki.data.type.SimpleTypeInformation<V> type)	Initialize factory from a data type.
protected double[]	multivariateStandardization(double[] raw)
protected double[]	univariateStandardization(double[] raw)

Methods inherited from class elki.datasource.filter.AbstractStreamConversionFilter

data, getMeta, nextEvent

Methods inherited from class elki.datasource.filter.AbstractStreamFilter

asMultipleObjectsBundle, assignDBID, filter, hasDBIDs, init, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface elki.datasource.filter.normalization.Normalization

restore, transform

Methods inherited from interface elki.datasource.filter.ObjectFilter

filter

Field Detail

multiplicity

private int multiplicity

Multiplicity of the vector.

Constructor Detail

InstanceMeanVarianceNormalization

public InstanceMeanVarianceNormalization()

Constructor.

Method Detail

filterSingleObject

protected V filterSingleObject(V featureVector)

Description copied from class: AbstractStreamConversionFilter

Normalize a single instance. You can implement this as UnsupportedOperationException if you override both public "normalize" functions!

Specified by:

filterSingleObject in class AbstractStreamConversionFilter<V extends elki.data.NumberVector,V extends elki.data.NumberVector>

Parameters:

featureVector - Database object to normalize

Returns:

Normalized database object

univariateStandardization

protected double[] univariateStandardization(double[] raw)

multivariateStandardization

protected double[] multivariateStandardization(double[] raw)

initializeOutputType

protected void initializeOutputType(elki.data.type.SimpleTypeInformation<V> type)

Description copied from class: AbstractVectorStreamConversionFilter

Initialize factory from a data type.

Overrides:

initializeOutputType in class AbstractVectorStreamConversionFilter<V extends elki.data.NumberVector,V extends elki.data.NumberVector>

Parameters:

type - Output data type information.

convertedType

protected elki.data.type.SimpleTypeInformation<? super V> convertedType(elki.data.type.SimpleTypeInformation<V> in)

Description copied from class: AbstractStreamConversionFilter

Get the output type from the input type after conversion.

Specified by:

convertedType in class AbstractStreamConversionFilter<V extends elki.data.NumberVector,V extends elki.data.NumberVector>

Parameters:

in - input type restriction

Returns:

output type restriction

getInputTypeRestriction

protected elki.data.type.SimpleTypeInformation<? super V> getInputTypeRestriction()

Description copied from class: AbstractStreamConversionFilter

Get the input type restriction used for negotiating the data query.

Specified by:

getInputTypeRestriction in class AbstractStreamConversionFilter<V extends elki.data.NumberVector,V extends elki.data.NumberVector>

Returns:

Type restriction