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

Class AbstractRandomFeatureSelectionFilter<V extends FeatureVector<?,?>>

java.lang.Object

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

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

de.lmu.ifi.dbs.elki.datasource.filter.AbstractRandomFeatureSelectionFilter<V>

Type Parameters:

V - the type of FeatureVector contained in both the original data of the base parser and the projected data of this ProjectionParser

All Implemented Interfaces:

BundleStreamSource, ObjectFilter, StreamFilter, InspectionUtilFrequentlyScanned

Direct Known Subclasses:

DoubleVectorRandomProjectionFilter, SparseNumberVectorRandomProjectionFilter

public abstract class AbstractRandomFeatureSelectionFilter<V extends FeatureVector<?,?>>
extends AbstractStreamConversionFilter<V,V>

A RandomProjectionParser selects a subset of attributes randomly for projection of a ParsingResult.

The cardinality of the subset of attributes is specified as a parameter.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	AbstractRandomFeatureSelectionFilter.Parameterizer<V extends NumberVector<V,?>> 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
protected int	k Holds the desired cardinality of the subset of attributes selected for projection.
static OptionID	NUMBER_SELECTED_ATTRIBUTES_ID Parameter for the desired cardinality of the subset of attributes selected for projection.
protected Random	random Holds a random object.
static OptionID	SEED_ID Optional parameter to specify a seed for random projection.
protected BitSet	selectedAttributes The selected attributes

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

column, meta

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

source

Constructor Summary

Constructors

Constructor and Description
AbstractRandomFeatureSelectionFilter(int dim) Constructor.
AbstractRandomFeatureSelectionFilter(int dim, long seed) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
(package private) void	initializeRandomAttributes(SimpleTypeInformation<V> in) Initialize random attributes.

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

convertedType, data, filterSingleObject, getInputTypeRestriction, 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

protected BitSet selectedAttributes

The selected attributes

NUMBER_SELECTED_ATTRIBUTES_ID

public static final OptionID NUMBER_SELECTED_ATTRIBUTES_ID

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

Key: -randomprojection.numberselected

Default: 1

Constraint: ≥1

SEED_ID

public static final OptionID SEED_ID

Optional parameter to specify a seed for random projection. If unused, system time is used as seed.

Key: -randomprojection.seed

k

protected int k

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

random

protected final Random random

Holds a random object.

Constructor Detail

AbstractRandomFeatureSelectionFilter

public AbstractRandomFeatureSelectionFilter(int dim)

Constructor.

Parameters:

dim - dimensionality

AbstractRandomFeatureSelectionFilter

public AbstractRandomFeatureSelectionFilter(int dim,
                                    long seed)

Constructor.

Parameters:

dim - dimensionality

seed - seed for random

Method Detail

initializeRandomAttributes

void initializeRandomAttributes(SimpleTypeInformation<V> in)

Initialize random attributes. Invoke this from AbstractStreamConversionFilter.convertedType(de.lmu.ifi.dbs.elki.data.type.SimpleTypeInformation<I>)!

Parameters:

in - Type information.