de.lmu.ifi.dbs.elki.algorithm.outlier.lof

Class LDF<O extends NumberVector>

java.lang.Object

de.lmu.ifi.dbs.elki.algorithm.AbstractAlgorithm<R>

de.lmu.ifi.dbs.elki.algorithm.AbstractDistanceBasedAlgorithm<O,OutlierResult>

de.lmu.ifi.dbs.elki.algorithm.outlier.lof.LDF<O>

Type Parameters:

O - the type of objects handled by this algorithm

All Implemented Interfaces:

Algorithm, DistanceBasedAlgorithm<O>, OutlierAlgorithm

@Title(value="LDF: Outlier Detection with Kernel Density Functions")
 @Reference(authors="L. J. Latecki, A. Lazarevic, D. Pokrajac",
           title="Outlier Detection with Kernel Density Functions",
           booktitle="Machine Learning and Data Mining in Pattern Recognition",
           url="https://doi.org/10.1007/978-3-540-73499-4_6",
           bibkey="DBLP:conf/mldm/LateckiLP07")
 @Alias(value="de.lmu.ifi.dbs.elki.algorithm.outlier.LDF")
public class LDF<O extends NumberVector>
extends AbstractDistanceBasedAlgorithm<O,OutlierResult>
implements OutlierAlgorithm

Outlier Detection with Kernel Density Functions.

A variation of LOF which uses kernel density estimation, but in contrast to SimpleKernelDensityLOF also uses the reachability concept of LOF.

Reference:

Outlier Detection with Kernel Density Functions
L. J. Latecki, A. Lazarevic, D. Pokrajac
Machine Learning and Data Mining in Pattern Recognition

Since:

0.5.5

Author:

Erich Schubert

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	LDF.Parameterizer<O extends NumberVector> Parameterization class.

Field Summary

Fields

Modifier and Type	Field and Description
protected double	c Scaling constant, to limit value range to 1/c
protected double	h Bandwidth scaling factor.
protected int	k Parameter k.
private KernelDensityFunction	kernel Kernel density function
private static Logging	LOG The logger for this class.

Fields inherited from class de.lmu.ifi.dbs.elki.algorithm.AbstractAlgorithm

ALGORITHM_ID

Fields inherited from interface de.lmu.ifi.dbs.elki.algorithm.DistanceBasedAlgorithm

DISTANCE_FUNCTION_ID

Constructor Summary

Constructors

Constructor and Description
LDF(int k, DistanceFunction<? super O> distance, KernelDensityFunction kernel, double h, double c) Constructor.

Method Summary

Modifier and Type	Method and Description
TypeInformation[]	getInputTypeRestriction() Get the input type restriction used for negotiating the data query.
protected Logging	getLogger() Get the (STATIC) logger for this class.
OutlierResult	run(Database database, Relation<O> relation) Run the naive kernel density LOF algorithm.

Methods inherited from class de.lmu.ifi.dbs.elki.algorithm.AbstractDistanceBasedAlgorithm

getDistanceFunction

Methods inherited from class de.lmu.ifi.dbs.elki.algorithm.AbstractAlgorithm

run

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.lmu.ifi.dbs.elki.algorithm.outlier.OutlierAlgorithm

run

Field Detail

LOG

private static final Logging LOG

The logger for this class.

k

protected int k

Parameter k.

h

protected double h

Bandwidth scaling factor.

c

protected double c

Scaling constant, to limit value range to 1/c

kernel

private KernelDensityFunction kernel

Kernel density function

Constructor Detail

LDF

public LDF(int k,
           DistanceFunction<? super O> distance,
           KernelDensityFunction kernel,
           double h,
           double c)

Constructor.

Parameters:

k - the value of k

kernel - Kernel function

h - Kernel bandwidth scaling

c - Score scaling parameter

Method Detail

run

public OutlierResult run(Database database,
                         Relation<O> relation)

Run the naive kernel density LOF algorithm.

Parameters:

database - Database to query

relation - Data to process

Returns:

LOF outlier result

getInputTypeRestriction

public TypeInformation[] getInputTypeRestriction()

Description copied from class: AbstractAlgorithm

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

Specified by:

getInputTypeRestriction in interface Algorithm

Specified by:

getInputTypeRestriction in class AbstractAlgorithm<OutlierResult>

Returns:

Type restriction

getLogger

protected Logging getLogger()

Description copied from class: AbstractAlgorithm

Get the (STATIC) logger for this class.

Specified by:

getLogger in class AbstractAlgorithm<OutlierResult>

Returns:

the static logger