de.lmu.ifi.dbs.elki.index.preprocessed.subspaceproj

Class FourCSubspaceIndex<V extends NumberVector<?>,D extends Distance<D>>

java.lang.Object

de.lmu.ifi.dbs.elki.index.AbstractIndex<O>

de.lmu.ifi.dbs.elki.index.preprocessed.AbstractPreprocessorIndex<NV,P>

de.lmu.ifi.dbs.elki.index.preprocessed.subspaceproj.AbstractSubspaceProjectionIndex<V,D,PCAFilteredResult>

de.lmu.ifi.dbs.elki.index.preprocessed.subspaceproj.FourCSubspaceIndex<V,D>

Type Parameters:

V - Vector type

D - Distance type

All Implemented Interfaces:

Index, LocalProjectionIndex<V,PCAFilteredResult>, SubspaceProjectionIndex<V,PCAFilteredResult>, Result

@Title(value="4C Preprocessor")
@Description(value="Computes the local dimensionality and locally weighted matrix of objects of a certain database according to the 4C algorithm.\nThe PCA is based on epsilon range queries.")
public class FourCSubspaceIndex<V extends NumberVector<?>,D extends Distance<D>>
extends AbstractSubspaceProjectionIndex<V,D,PCAFilteredResult>

Preprocessor for 4C local dimensionality and locally weighted matrix assignment to objects of a certain database.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	FourCSubspaceIndex.Factory<V extends NumberVector<?>,D extends Distance<D>> Factory class for 4C preprocessors.

Field Summary

Fields

Modifier and Type	Field and Description
private static Logging	LOG Our logger
private PCAFilteredRunner<V>	pca The Filtered PCA Runner

Fields inherited from class de.lmu.ifi.dbs.elki.index.preprocessed.subspaceproj.AbstractSubspaceProjectionIndex

epsilon, minpts, rangeQueryDistanceFunction

Fields inherited from class de.lmu.ifi.dbs.elki.index.preprocessed.AbstractPreprocessorIndex

storage

Fields inherited from class de.lmu.ifi.dbs.elki.index.AbstractIndex

relation

Constructor Summary

Constructors

Constructor and Description
FourCSubspaceIndex(Relation<V> relation, D epsilon, DistanceFunction<V,D> rangeQueryDistanceFunction, int minpts, PCAFilteredRunner<V> pca) Full constructor.

Method Summary

Methods

Modifier and Type	Method and Description
protected PCAFilteredResult	computeProjection(DBIDRef id, DistanceDBIDList<D> neighbors, Relation<V> database) This method implements the type of variance analysis to be computed for a given point.
protected Logging	getLogger() Get the classes static logger.
String	getLongName() A "pretty" name for the result, for use in titles, captions and menus.
String	getShortName() A short name for the result, useful for file names.
void	logStatistics() Send statistics to the logger, if enabled.

Methods inherited from class de.lmu.ifi.dbs.elki.index.preprocessed.subspaceproj.AbstractSubspaceProjectionIndex

getLocalProjection, initialize

Methods inherited from class java.lang.Object

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

Field Detail

LOG

private static final Logging LOG

Our logger

pca

private PCAFilteredRunner<V extends NumberVector<?>> pca

The Filtered PCA Runner

Constructor Detail

FourCSubspaceIndex

public FourCSubspaceIndex(Relation<V> relation,
                  D epsilon,
                  DistanceFunction<V,D> rangeQueryDistanceFunction,
                  int minpts,
                  PCAFilteredRunner<V> pca)

Full constructor.

Parameters:

relation - Relation

epsilon - Epsilon value

rangeQueryDistanceFunction -

minpts - MinPts value

pca - PCA runner

Method Detail

computeProjection

protected PCAFilteredResult computeProjection(DBIDRef id,
                                  DistanceDBIDList<D> neighbors,
                                  Relation<V> database)

Description copied from class: AbstractSubspaceProjectionIndex

This method implements the type of variance analysis to be computed for a given point.

Example1: for 4C, this method should implement a PCA for the given point. Example2: for PreDeCon, this method should implement a simple axis-parallel variance analysis.

Specified by:

computeProjection in class AbstractSubspaceProjectionIndex<V extends NumberVector<?>,D extends Distance<D>,PCAFilteredResult>

Parameters:

id - the given point

neighbors - the neighbors as query results of the given point

database - the database for which the preprocessing is performed

Returns:

local subspace projection

getLogger

protected Logging getLogger()

Description copied from class: AbstractPreprocessorIndex

Get the classes static logger.

Specified by:

getLogger in class AbstractPreprocessorIndex<V extends NumberVector<?>,PCAFilteredResult>

Returns:

Logger

getLongName

public String getLongName()

Description copied from interface: Result

A "pretty" name for the result, for use in titles, captions and menus.

Specified by:

getLongName in interface Result

Specified by:

getLongName in class AbstractIndex<V extends NumberVector<?>>

Returns:

result name

getShortName

public String getShortName()

Description copied from interface: Result

A short name for the result, useful for file names.

Specified by:

getShortName in interface Result

Specified by:

getShortName in class AbstractIndex<V extends NumberVector<?>>

Returns:

result name

logStatistics

public void logStatistics()

Description copied from interface: Index

Send statistics to the logger, if enabled. Note: you must have set the logging level appropriately before initializing the index! Otherwise, the index might not have collected the desired statistics.