Package elki.outlier.anglebased

Class ABOD<V extends NumberVector>

java.lang.Object

elki.outlier.anglebased.ABOD<V>

Type Parameters:

V - Vector type

All Implemented Interfaces:

Algorithm, OutlierAlgorithm

Direct Known Subclasses:

FastABOD

@Title("ABOD: Angle-Based Outlier Detection")
@Description("Outlier detection using variance analysis on angles, especially for high dimensional data sets.")
@Reference(authors="Hans-Peter Kriegel, Matthias Schubert, Arthur Zimek",
           title="Angle-Based Outlier Detection in High-dimensional Data",
           booktitle="Proc. 14th ACM SIGKDD Int. Conf. Knowledge Discovery and Data Mining (KDD\'08)",
           url="https://doi.org/10.1145/1401890.1401946",
           bibkey="DBLP:conf/kdd/KriegelSZ08")
public class ABOD<V extends NumberVector>
extends java.lang.Object
implements OutlierAlgorithm

Angle-Based Outlier Detection / Angle-Based Outlier Factor.

Outlier detection using variance analysis on angles, especially for high dimensional data sets. Exact version, which has cubic runtime (see also FastABOD and LBABOD for faster versions).

Reference:

Hans-Peter Kriegel, Matthias Schubert, Arthur Zimek
Angle-Based Outlier Detection in High-dimensional Data
Proc. 14th ACM SIGKDD Int. Conf. Knowledge Discovery and Data Mining (KDD'08)

Since:

0.2

Author:

Matthias Schubert (Original Code), Erich Schubert (ELKIfication)

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ABOD.Par<V extends NumberVector>	Parameterization class.

Nested classes/interfaces inherited from interface elki.Algorithm

Algorithm.Utils

Field Summary

Fields

Modifier and Type	Field	Description
protected Similarity<? super V>	kernelFunction	Store the configured Kernel version.

Constructor Summary

Constructors

Constructor	Description
ABOD(Similarity<? super V> kernelFunction)	Constructor for Angle-Based Outlier Detection (ABOD).

Method Summary

Modifier and Type	Method	Description
protected double	computeABOF(KernelMatrix kernelMatrix, DBIDRef pA, DBIDArrayIter pB, DBIDArrayIter pC, MeanVariance s)	Compute the exact ABOF value.
TypeInformation[]	getInputTypeRestriction()	Get the input type restriction used for negotiating the data query.
OutlierResult	run(Relation<V> relation)	Run ABOD on the data set.

Methods inherited from class java.lang.Object

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

Methods inherited from interface elki.outlier.OutlierAlgorithm

autorun

Field Detail

kernelFunction

protected Similarity<? super V extends NumberVector> kernelFunction

Store the configured Kernel version.

Constructor Detail

ABOD

public ABOD(Similarity<? super V> kernelFunction)

Constructor for Angle-Based Outlier Detection (ABOD).

Parameters:

kernelFunction - kernel function to use

Method Detail

run

public OutlierResult run(Relation<V> relation)

Run ABOD on the data set.

Returns:

Angle-based outlier detection result

computeABOF

protected double computeABOF(KernelMatrix kernelMatrix,
                             DBIDRef pA,
                             DBIDArrayIter pB,
                             DBIDArrayIter pC,
                             MeanVariance s)

Compute the exact ABOF value.

Parameters:

kernelMatrix - Kernel matrix

pA - Object A to compute ABOF for

pB - Iterator over objects B

pC - Iterator over objects C

s - Statistics tracker

Returns:

ABOF value

getInputTypeRestriction

public TypeInformation[] getInputTypeRestriction()

Description copied from interface: Algorithm

Get the input type restriction used for negotiating the data query.

Specified by:

getInputTypeRestriction in interface Algorithm

Returns:

Type restriction