de.lmu.ifi.dbs.elki.algorithm.clustering

Class OPTICSXi<N extends NumberDistance<N,?>>

java.lang.Object

de.lmu.ifi.dbs.elki.algorithm.AbstractAlgorithm<Clustering<OPTICSModel>>

de.lmu.ifi.dbs.elki.algorithm.clustering.OPTICSXi<N>

Type Parameters:

N - Number distance used by OPTICS

All Implemented Interfaces:

Algorithm, ClusteringAlgorithm<Clustering<OPTICSModel>>, InspectionUtilFrequentlyScanned, Parameterizable

public class OPTICSXi<N extends NumberDistance<N,?>>
extends AbstractAlgorithm<Clustering<OPTICSModel>>
implements ClusteringAlgorithm<Clustering<OPTICSModel>>

Class to handle OPTICS Xi extraction.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	OPTICSXi.Parameterizer<D extends NumberDistance<D,?>> Parameterization class.
static class	OPTICSXi.SteepArea Data structure to represent a steep-down-area for the xi method.
static class	OPTICSXi.SteepAreaResult Result containing the chi-steep areas.
static class	OPTICSXi.SteepDownArea Data structure to represent a steep-down-area for the xi method.
private static class	OPTICSXi.SteepScanPosition<N extends NumberDistance<N,?>> Position when scanning for steep areas
static class	OPTICSXi.SteepUpArea Data structure to represent a steep-down-area for the xi method.

Field Summary

Fields

Modifier and Type	Field and Description
private static Logging	LOG The logger for this class.
(package private) OPTICSTypeAlgorithm<N>	optics The actual algorithm we use.
(package private) double	xi Xi parameter
static OptionID	XI_ID Parameter to specify the steepness threshold.
static OptionID	XIALG_ID Parameter to specify the actual OPTICS algorithm to use.

Constructor Summary

Constructors

Constructor and Description
OPTICSXi(OPTICSTypeAlgorithm<N> optics, double xi) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
private Clustering<OPTICSModel>	extractClusters(ClusterOrderResult<N> clusterOrderResult, Relation<?> relation, double ixi, int minpts) Extract clusters from a cluster order result.
TypeInformation[]	getInputTypeRestriction() Get the input type restriction used for negotiating the data query.
protected Logging	getLogger() Get the (STATIC) logger for this class.
Clustering<OPTICSModel>	run(Database database, Relation<?> relation)
private static void	updateFilterSDASet(double mib, List<OPTICSXi.SteepDownArea> sdaset, double ixi) Update the mib values of SteepDownAreas, and remove obsolete areas.

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.clustering.ClusteringAlgorithm

run

Field Detail

LOG

private static final Logging LOG

The logger for this class.

XIALG_ID

public static final OptionID XIALG_ID

Parameter to specify the actual OPTICS algorithm to use.

XI_ID

public static final OptionID XI_ID

Parameter to specify the steepness threshold.

optics

OPTICSTypeAlgorithm<N extends NumberDistance<N,?>> optics

The actual algorithm we use.

xi

double xi

Xi parameter

Constructor Detail

OPTICSXi

public OPTICSXi(OPTICSTypeAlgorithm<N> optics,
        double xi)

Constructor.

Parameters:

optics - OPTICS algorithm to use

xi - Xi value

Method Detail

run

public Clustering<OPTICSModel> run(Database database,
                          Relation<?> relation)

extractClusters

private Clustering<OPTICSModel> extractClusters(ClusterOrderResult<N> clusterOrderResult,
                                      Relation<?> relation,
                                      double ixi,
                                      int minpts)

Extract clusters from a cluster order result.

Parameters:

clusterOrderResult - cluster order result

relation - Relation

ixi - Parameter 1 - Xi

minpts - Parameter minPts

updateFilterSDASet

private static void updateFilterSDASet(double mib,
                      List<OPTICSXi.SteepDownArea> sdaset,
                      double ixi)

Update the mib values of SteepDownAreas, and remove obsolete areas.

Parameters:

mib - Maximum in-between value

sdaset - Set of steep down areas.

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<Clustering<OPTICSModel>>

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<Clustering<OPTICSModel>>

Returns:

the static logger