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

Class Log1PlusNormalization<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.normalization.AbstractStreamNormalization<V>

de.lmu.ifi.dbs.elki.datasource.filter.normalization.instancewise.Log1PlusNormalization<V>

Type Parameters:

V - vector type

All Implemented Interfaces:

BundleStreamSource, Normalization<V>, ObjectFilter, StreamFilter

public class Log1PlusNormalization<V extends NumberVector>
extends AbstractStreamNormalization<V>

Normalize the data set by applying log(1+|x|*b)/log(b+1) to any value. If the input data was in [0;1], then the resulting values will be in the same range. By default b=1, and thus the transformation is log2(1+|x|).

Since:

0.5.0

Author:

Erich Schubert

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Log1PlusNormalization.Parameterizer<V extends NumberVector> 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 double	boost Boosting factor, and scaling coefficient.
protected double	scale Boosting factor, and scaling coefficient.
static Log1PlusNormalization<NumberVector>	STATIC Static instance.

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
Log1PlusNormalization(double boost) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
protected V	filterSingleObject(V featureVector) Normalize a single instance.
protected SimpleTypeInformation<? super V>	getInputTypeRestriction() Get the input type restriction used for negotiating the data query.

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

convertedType, restore, toString, transform

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

asMultipleObjectsBundle, assignDBID, filter, hasDBIDs, init

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.lmu.ifi.dbs.elki.datasource.filter.ObjectFilter

filter

Field Detail

STATIC

public static final Log1PlusNormalization<NumberVector> STATIC

Static instance.

boost

protected double boost

Boosting factor, and scaling coefficient.

scale

protected double scale

Boosting factor, and scaling coefficient.

Constructor Detail

Log1PlusNormalization

public Log1PlusNormalization(double boost)

Constructor.

Parameters:

boost - Boosting parameter

Method Detail

filterSingleObject

protected V filterSingleObject(V featureVector)

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:

featureVector - 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