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

Class SOF<N,O>

java.lang.Object

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

de.lmu.ifi.dbs.elki.algorithm.outlier.spatial.AbstractNeighborhoodOutlier<N>

de.lmu.ifi.dbs.elki.algorithm.outlier.spatial.AbstractDistanceBasedSpatialOutlier<N,O>

de.lmu.ifi.dbs.elki.algorithm.outlier.spatial.SOF<N,O>

Type Parameters:

N - Neighborhood object type

O - Attribute object type

All Implemented Interfaces:

Algorithm, OutlierAlgorithm

@Title(value="Spatial Outlier Factor")
 @Reference(authors="T. Huang, X. Qin",
           title="Detecting outliers in spatial database",
           booktitle="Proc. 3rd International Conference on Image and Graphics",
           url="https://doi.org/10.1109/ICIG.2004.53",
           bibkey="DBLP:conf/icig/HuangQ04")
public class SOF<N,O>
extends AbstractDistanceBasedSpatialOutlier<N,O>

The Spatial Outlier Factor (SOF) is a spatial LOF variation.

Since the "reachability distance" of LOF cannot be used canonically in the bichromatic case, this part of LOF is dropped and the exact distance is used instead.

Reference:

T. Huang, X. Qin
Detecting outliers in spatial database
Proc. 3rd International Conference on Image and Graphics

A LOF variation simplified with reachDist(o,p) == dist(o,p).

Since:

0.4.0

Author:

Ahmed Hettab

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SOF.Parameterizer<N,O> Parameterization class

Field Summary

Fields

Modifier and Type	Field and Description
private static Logging	LOG The logger for this class.

Fields inherited from class de.lmu.ifi.dbs.elki.algorithm.outlier.spatial.AbstractNeighborhoodOutlier

NEIGHBORHOOD_ID

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

ALGORITHM_ID

Constructor Summary

Constructors

Constructor and Description
SOF(NeighborSetPredicate.Factory<N> npred, PrimitiveDistanceFunction<O> nonSpatialDistanceFunction) 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<N> spatial, Relation<O> relation) The main run method

Methods inherited from class de.lmu.ifi.dbs.elki.algorithm.outlier.spatial.AbstractDistanceBasedSpatialOutlier

getNonSpatialDistanceFunction

Methods inherited from class de.lmu.ifi.dbs.elki.algorithm.outlier.spatial.AbstractNeighborhoodOutlier

getNeighborSetPredicateFactory

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.

Constructor Detail

SOF

public SOF(NeighborSetPredicate.Factory<N> npred,
           PrimitiveDistanceFunction<O> nonSpatialDistanceFunction)

Constructor.

Parameters:

npred - Neighborhood predicate

nonSpatialDistanceFunction - Distance function on non-spatial attributes

Method Detail

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

run

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

The main run method

Parameters:

database - Database to use (actually unused)

spatial - Relation for neighborhood

relation - Attributes to evaluate

Returns:

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