Package elki.datasource.filter.transform

Class NumberVectorRandomFeatureSelectionFilter<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.transform.NumberVectorRandomFeatureSelectionFilter<V>

Type Parameters:

V - vector type

All Implemented Interfaces:

elki.datasource.bundle.BundleStreamSource, elki.datasource.filter.ObjectFilter, elki.datasource.filter.StreamFilter

public class NumberVectorRandomFeatureSelectionFilter<V extends elki.data.NumberVector>
extends AbstractVectorStreamConversionFilter<V,V>

Parser to project the ParsingResult obtained by a suitable base parser onto a randomly selected subset of attributes.

Since:

0.4.0

Author:

Arthur Zimek

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	NumberVectorRandomFeatureSelectionFilter.Par	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
protected int	k	Holds the desired cardinality of the subset of attributes selected for projection.
protected elki.utilities.random.RandomFactory	rnd	Holds a random generator.
protected long[]	selectedAttributes	The selected attributes.

Fields inherited from class elki.datasource.filter.AbstractVectorStreamConversionFilter

factory

Fields inherited from class elki.datasource.filter.AbstractStreamFilter

source

Constructor Summary

Constructors

Constructor	Description
NumberVectorRandomFeatureSelectionFilter(int dim, elki.utilities.random.RandomFactory rnd)	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 obj)	Normalize a single instance.
protected elki.data.type.SimpleTypeInformation<? super V>	getInputTypeRestriction()	Get the input type restriction used for negotiating the data query.
(package private) void	initializeRandomAttributes(elki.data.type.SimpleTypeInformation<V> in)	Initialize random attributes.

Methods inherited from class elki.datasource.filter.AbstractVectorStreamConversionFilter

initializeOutputType

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

Field Detail

selectedAttributes

protected long[] selectedAttributes

The selected attributes.

k

protected int k

Holds the desired cardinality of the subset of attributes selected for projection.

rnd

protected elki.utilities.random.RandomFactory rnd

Holds a random generator.

Constructor Detail

NumberVectorRandomFeatureSelectionFilter

public NumberVectorRandomFeatureSelectionFilter(int dim,
                                                elki.utilities.random.RandomFactory rnd)

Constructor.

Parameters:

dim - Dimensionality

rnd - Random generator

Method Detail

filterSingleObject

protected V filterSingleObject(V obj)

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:

obj - Database object to normalize

Returns:

Normalized database object

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

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

initializeRandomAttributes

void initializeRandomAttributes(elki.data.type.SimpleTypeInformation<V> in)

Initialize random attributes. Invoke this from convertedType(elki.data.type.SimpleTypeInformation<V>)!

Parameters:

in - Type information.