de.lmu.ifi.dbs.elki.datasource.filter.normalization.instancewise

Class InstanceMeanVarianceNormalization<V extends NumberVector>

java.lang.Object

de.lmu.ifi.dbs.elki.datasource.filter.AbstractStreamFilter

de.lmu.ifi.dbs.elki.datasource.filter.AbstractStreamConversionFilter<I,O>

de.lmu.ifi.dbs.elki.datasource.filter.AbstractVectorStreamConversionFilter<V,V>

de.lmu.ifi.dbs.elki.datasource.filter.normalization.instancewise.InstanceMeanVarianceNormalization<V>

Type Parameters:

V - vector type

All Implemented Interfaces:

BundleStreamSource, Normalization<V>, ObjectFilter, StreamFilter

public class InstanceMeanVarianceNormalization<V extends 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 and Description
static class	InstanceMeanVarianceNormalization.Parameterizer<V extends NumberVector> Parameterization class.

Nested classes/interfaces inherited from interface de.lmu.ifi.dbs.elki.datasource.bundle.BundleStreamSource

BundleStreamSource.Event

Field Summary

Fields

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

Fields inherited from class de.lmu.ifi.dbs.elki.datasource.filter.AbstractVectorStreamConversionFilter

factory

Fields inherited from class de.lmu.ifi.dbs.elki.datasource.filter.AbstractStreamFilter

source

Constructor Summary

Constructors

Constructor and Description
InstanceMeanVarianceNormalization() Constructor.

Method Summary

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

Methods inherited from class de.lmu.ifi.dbs.elki.datasource.filter.AbstractStreamConversionFilter

data, getMeta, nextEvent

Methods inherited from class de.lmu.ifi.dbs.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 de.lmu.ifi.dbs.elki.datasource.filter.normalization.Normalization

restore, transform

Methods inherited from interface de.lmu.ifi.dbs.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 NumberVector,V extends 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(SimpleTypeInformation<V> type)

Description copied from class: AbstractVectorStreamConversionFilter

Initialize factory from a data type.

Overrides:

initializeOutputType in class AbstractVectorStreamConversionFilter<V extends NumberVector,V extends NumberVector>

Parameters:

type - Output data type information.

convertedType

protected SimpleTypeInformation<? super V> convertedType(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 NumberVector,V extends NumberVector>

Parameters:

in - input type restriction

Returns:

output type restriction

getInputTypeRestriction

protected 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 NumberVector,V extends NumberVector>

Returns:

Type restriction