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

Class SLOM<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.SLOM<N,O>

Type Parameters:

N - the type the spatial neighborhood is defined over

O - the type of objects handled by the algorithm

All Implemented Interfaces:

Algorithm, OutlierAlgorithm

@Title(value="SLOM: a new measure for local spatial outliers")
@Description(value="Spatial local outlier measure (SLOM), which captures the local behaviour of datum in their spatial neighbourhood")
@Reference(authors="Sanjay Chawla and Pei Sun",
           title="SLOM: a new measure for local spatial outliers",
           booktitle="Knowledge and Information Systems 9(4), 412-429, 2006",
           url="http://dx.doi.org/10.1007/s10115-005-0200-2")
public class SLOM<N,O>
extends AbstractDistanceBasedSpatialOutlier<N,O>

SLOM: a new measure for local spatial outliers

Reference:
Sanjay Chawla and Pei Sun
SLOM: a new measure for local spatial outliers
in Knowledge and Information Systems 9(4), 412-429, 2006

This implementation works around some corner cases in SLOM, in particular when an object has none or a single neighbor only (albeit the results will still not be too useful then), which will result in divisions by zero.

Author:

Ahmed Hettab

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SLOM.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.AbstractDistanceBasedSpatialOutlier

NON_SPATIAL_DISTANCE_FUNCTION_ID

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

NEIGHBORHOOD_ID

Constructor Summary

Constructors

Constructor and Description
SLOM(NeighborSetPredicate.Factory<N> npred, PrimitiveDistanceFunction<O> nonSpatialDistanceFunction) Constructor.

Method Summary

Methods

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)

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

makeParameterDistanceFunction, 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

SLOM

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

Constructor.

Parameters:

npred - Neighborhood predicate

nonSpatialDistanceFunction - Distance function to use on the non-spatial attributes

Method Detail

run

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

Parameters:

database - Database to process

spatial - Spatial Relation to use.

relation - Relation to use.

Returns:

Outlier detection result

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

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