Package elki.datasource.filter.transform

Class NumberVectorFeatureSelectionFilter<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.NumberVectorFeatureSelectionFilter<V>

Type Parameters:

V - Vector type

All Implemented Interfaces:

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

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

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

Since:

0.5.5

Author:

Arthur Zimek

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	NumberVectorFeatureSelectionFilter.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
private long[]	selectedAttributes	Keeps the selection of the subspace to project onto.

Fields inherited from class elki.datasource.filter.AbstractVectorStreamConversionFilter

factory

Fields inherited from class elki.datasource.filter.AbstractStreamFilter

source

Constructor Summary

Constructors

Constructor	Description
NumberVectorFeatureSelectionFilter(long[] selectedAttributes)	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.
int	getDimensionality()	Get the resulting dimensionality.
protected elki.data.type.SimpleTypeInformation<? super V>	getInputTypeRestriction()	Get the input type restriction used for negotiating the data query.
long[]	getSelectedAttributes()	Provides a BitSet with the bits set to true corresponding to the selected attributes in NumberVectorFeatureSelectionFilter.Par.SELECTED_ATTRIBUTES_ID.
void	setSelectedAttributes(long[] selectedAttributes)	Sets the bits set to true in the given BitSet as selected attributes in NumberVectorFeatureSelectionFilter.Par.SELECTED_ATTRIBUTES_ID.

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

private long[] selectedAttributes

Keeps the selection of the subspace to project onto.

Constructor Detail

NumberVectorFeatureSelectionFilter

public NumberVectorFeatureSelectionFilter(long[] selectedAttributes)

Constructor.

Parameters:

selectedAttributes - Selected attributes

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

setSelectedAttributes

public void setSelectedAttributes(long[] selectedAttributes)

Sets the bits set to true in the given BitSet as selected attributes in NumberVectorFeatureSelectionFilter.Par.SELECTED_ATTRIBUTES_ID.

Parameters:

selectedAttributes - the new selected attributes

getSelectedAttributes

public long[] getSelectedAttributes()

Provides a BitSet with the bits set to true corresponding to the selected attributes in NumberVectorFeatureSelectionFilter.Par.SELECTED_ATTRIBUTES_ID.

Returns:

the selected attributes

getDimensionality

public int getDimensionality()

Get the resulting dimensionality.

Returns:

dimensionality