de.lmu.ifi.dbs.elki.algorithm.outlier.spatial
Class SLOM<N,O,D extends NumberDistance<D,?>>

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

Type Parameters:

N - the type the spatial neighborhood is defined over

O - the type of objects handled by the algorithm

D - the type of Distance used for non spatial attributes

All Implemented Interfaces:

Algorithm, OutlierAlgorithm, InspectionUtilFrequentlyScanned, Parameterizable

@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 2005",
           url="http://rp-www.cs.usyd.edu.au/~chawlarg/papers/KAIS_online.pdf")
public class SLOM<N,O,D extends NumberDistance<D,?>>
extends AbstractDistanceBasedSpatialOutlier<N,O,D>

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 2005

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.

Nested Class Summary

static class

SLOM.Parameterizer<N,O,D extends NumberDistance<D,?>> Parameterization class.

Field Summary

private static Logging

logger 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

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

Method Summary

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

logger

private static final Logging logger

The logger for this class.

Constructor Detail

SLOM

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