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

Class NumberVectorFeatureSelectionFilter<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.transform.NumberVectorFeatureSelectionFilter<V>

Type Parameters:

V - Vector type

All Implemented Interfaces:

BundleStreamSource, ObjectFilter, StreamFilter, InspectionUtilFrequentlyScanned

public class NumberVectorFeatureSelectionFilter<V extends NumberVector<?>>
extends AbstractVectorStreamConversionFilter<V,V>

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

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	NumberVectorFeatureSelectionFilter.Parameterizer 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 BitSet	selectedAttributes Keeps the selection of the subspace to project onto.

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
NumberVectorFeatureSelectionFilter(BitSet selectedAttributes) Constructor.

Method Summary

Methods

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 obj) Normalize a single instance.
int	getDimensionality() Get the resulting dimensionality.
protected SimpleTypeInformation<? super V>	getInputTypeRestriction() Get the input type restriction used for negotiating the data query.
BitSet	getSelectedAttributes() Provides a BitSet with the bits set to true corresponding to the selected attributes in NumberVectorFeatureSelectionFilter.Parameterizer.SELECTED_ATTRIBUTES_ID.
void	setSelectedAttributes(BitSet selectedAttributes) Sets the bits set to true in the given BitSet as selected attributes in NumberVectorFeatureSelectionFilter.Parameterizer.SELECTED_ATTRIBUTES_ID.

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

initializeOutputType

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

filter, init

Methods inherited from class java.lang.Object

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

Field Detail

selectedAttributes

private BitSet selectedAttributes

Keeps the selection of the subspace to project onto.

Constructor Detail

NumberVectorFeatureSelectionFilter

public NumberVectorFeatureSelectionFilter(BitSet 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 NumberVector<?>,V extends NumberVector<?>>

Parameters:

obj - Database object to normalize

Returns:

Normalized database object

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

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

setSelectedAttributes

public void setSelectedAttributes(BitSet selectedAttributes)

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

The index in the BitSet is expected to be shifted to the left by one, i.e., index 0 in the BitSet relates to the first attribute.

Parameters:

selectedAttributes - the new selected attributes

getSelectedAttributes

public BitSet getSelectedAttributes()

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

The index in the BitSet is shifted to the left by one, i.e., index 0 in the BitSet relates to the first attribute.

Returns:

the selected attributes

getDimensionality

public int getDimensionality()

Get the resulting dimensionality.

Returns:

dimensionality