Package elki.utilities.scaling.outlier

Class OutlierMinusLogScaling

java.lang.Object

elki.utilities.scaling.outlier.OutlierMinusLogScaling

All Implemented Interfaces:

OutlierScaling, elki.utilities.scaling.ScalingFunction

@Reference(authors="Hans-Peter Kriegel, Peer Kr\u00f6ger, Erich Schubert, Arthur Zimek",
           title="Interpreting and Unifying Outlier Scores",
           booktitle="Proc. 11th SIAM International Conference on Data Mining (SDM 2011)",
           url="https://doi.org/10.1137/1.9781611972818.2",
           bibkey="DBLP:conf/sdm/KriegelKSZ11")
public class OutlierMinusLogScaling
extends java.lang.Object
implements OutlierScaling

Scaling function to invert values by computing -log(x)

Useful for example for scaling ABOD, but see MinusLogStandardDeviationScaling and MinusLogGammaScaling for more advanced scalings for this algorithm.

Reference:

Hans-Peter Kriegel, Peer Kröger, Erich Schubert, Arthur Zimek
Interpreting and Unifying Outlier Scores
Proc. 11th SIAM International Conference on Data Mining (SDM 2011)

Since:

0.3

Author:

Erich Schubert

Field Summary

Fields

Modifier and Type	Field	Description
(package private) double	max	Maximum value seen, set by prepare(elki.result.outlier.OutlierResult)
(package private) double	mlogmax	Maximum -log value seen, set by prepare(elki.result.outlier.OutlierResult)

Constructor Summary

Constructors

Constructor	Description
OutlierMinusLogScaling()	Constructor.

Method Summary

Modifier and Type	Method	Description
double	getMax()
double	getMin()
double	getScaled(double value)
<A> void	prepare(A array, elki.utilities.datastructures.arraylike.NumberArrayAdapter<?,A> adapter)	Prepare is called once for each data set, before getScaled() will be called.
void	prepare(OutlierResult or)	Prepare is called once for each data set, before getScaled() will be called.

Methods inherited from class java.lang.Object

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

Field Detail

max

double max

Maximum value seen, set by prepare(elki.result.outlier.OutlierResult)

mlogmax

double mlogmax

Maximum -log value seen, set by prepare(elki.result.outlier.OutlierResult)

Constructor Detail

OutlierMinusLogScaling

public OutlierMinusLogScaling()

Constructor.

Method Detail

getScaled

public double getScaled(double value)

Specified by:

getScaled in interface elki.utilities.scaling.ScalingFunction

getMin

public double getMin()

Specified by:

getMin in interface elki.utilities.scaling.ScalingFunction

getMax

public double getMax()

Specified by:

getMax in interface elki.utilities.scaling.ScalingFunction

prepare

public void prepare(OutlierResult or)

Description copied from interface: OutlierScaling

Prepare is called once for each data set, before getScaled() will be called. This function can be used to extract global parameters such as means, minimums or maximums from the outlier scores.

Specified by:

prepare in interface OutlierScaling

Parameters:

or - Outlier result to use

prepare

public <A> void prepare(A array,
                        elki.utilities.datastructures.arraylike.NumberArrayAdapter<?,A> adapter)

Description copied from interface: OutlierScaling

Prepare is called once for each data set, before getScaled() will be called. This function can be used to extract global parameters such as means, minimums or maximums from the score array. The method using a full OutlierResult is preferred, as it will allow access to the metadata.

Specified by:

prepare in interface OutlierScaling

Parameters:

array - Data to process

adapter - Array adapter