Package elki.datasource.filter.cleaning

Class ReplaceNaNWithRandomFilter

java.lang.Object

elki.datasource.filter.AbstractStreamFilter

elki.datasource.filter.cleaning.ReplaceNaNWithRandomFilter

All Implemented Interfaces:

BundleStreamSource, ObjectFilter, StreamFilter

public class ReplaceNaNWithRandomFilter
extends AbstractStreamFilter

A filter to replace all NaN values with random values.

Note: currently, only dense vector columns are supported.

TODO: add support for sparse vectors.

Since:

0.6.0

Author:

Erich Schubert

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ReplaceNaNWithRandomFilter.Par	Parameterization class.

Nested classes/interfaces inherited from interface elki.datasource.bundle.BundleStreamSource

BundleStreamSource.Event

Field Summary

Fields

Modifier and Type	Field	Description
private NumberVector.Factory<?>[]	densecols	Columns to check.
private Distribution	dist	Distribution to generate replacement values with.
private static Logging	LOG	Class logger
private java.util.Random	rnd	Random generator.
private java.util.ArrayList<java.lang.Object>	rows	Row cache.

Fields inherited from class elki.datasource.filter.AbstractStreamFilter

source

Constructor Summary

Constructors

Constructor	Description
ReplaceNaNWithRandomFilter(Distribution dist, RandomFactory rnd)	Constructor.

Method Summary

Modifier and Type	Method	Description
java.lang.Object	data(int rnum)	Access a particular object and representation.
MultipleObjectsBundle	filter(MultipleObjectsBundle objects)	Filter a set of object packages.
BundleMeta	getMeta()	Get the current meta data.
BundleStreamSource.Event	nextEvent()	Get the next event
private void	updateMeta(BundleMeta meta)	Process an updated meta record.

Methods inherited from class elki.datasource.filter.AbstractStreamFilter

asMultipleObjectsBundle, assignDBID, hasDBIDs, init, toString

Methods inherited from class java.lang.Object

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

Field Detail

LOG

private static final Logging LOG

Class logger

densecols

private NumberVector.Factory<?>[] densecols

Columns to check.

dist

private Distribution dist

Distribution to generate replacement values with.

rows

private java.util.ArrayList<java.lang.Object> rows

Row cache.

rnd

private java.util.Random rnd

Random generator.

Constructor Detail

ReplaceNaNWithRandomFilter

public ReplaceNaNWithRandomFilter(Distribution dist,
                                  RandomFactory rnd)

Constructor.

Parameters:

dist - Distribution to draw from

rnd - Random generator

Method Detail

getMeta

public BundleMeta getMeta()

Description copied from interface: BundleStreamSource

Get the current meta data.

Returns:

Metadata

data

public java.lang.Object data(int rnum)

Description copied from interface: BundleStreamSource

Access a particular object and representation.

Parameters:

rnum - Representation number

Returns:

Contained data

nextEvent

public BundleStreamSource.Event nextEvent()

Description copied from interface: BundleStreamSource

Get the next event

Returns:

Event type

updateMeta

private void updateMeta(BundleMeta meta)

Process an updated meta record.

Parameters:

meta - Meta record

filter

public MultipleObjectsBundle filter(MultipleObjectsBundle objects)

Description copied from interface: ObjectFilter

Filter a set of object packages.

Specified by:

filter in interface ObjectFilter

Overrides:

filter in class AbstractStreamFilter

Parameters:

objects - Object to filter

Returns:

Filtered objects