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

Class HiSCPreferenceVectorIndex<V extends NumberVector>

java.lang.Object

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

de.lmu.ifi.dbs.elki.index.preprocessed.AbstractPreprocessorIndex<NV,long[]>

de.lmu.ifi.dbs.elki.index.preprocessed.preference.AbstractPreferenceVectorIndex<V>

de.lmu.ifi.dbs.elki.index.preprocessed.preference.HiSCPreferenceVectorIndex<V>

Type Parameters:

V - Vector type

All Implemented Interfaces:

Index, PreferenceVectorIndex<V>, Result

@Title(value="HiSC Preprocessor")
@Description(value="Computes the preference vector of objects of a certain database according to the HiSC algorithm.")
public class HiSCPreferenceVectorIndex<V extends NumberVector>
extends AbstractPreferenceVectorIndex<V>
implements PreferenceVectorIndex<V>

Preprocessor for HiSC preference vector assignment to objects of a certain database.

Author:

Elke Achtert

See Also:

HiSC

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	HiSCPreferenceVectorIndex.Factory<V extends NumberVector> Factory class.

Field Summary

Fields

Modifier and Type	Field and Description
protected double	alpha Holds the value of parameter alpha.
protected int	k Holds the value of parameter k.
private static Logging	LOG Logger to use.

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
HiSCPreferenceVectorIndex(Relation<V> relation, double alpha, int k) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
private long[]	determinePreferenceVector(Relation<V> relation, DBIDRef id, DBIDs neighborIDs, StringBuilder msg) Determines the preference vector according to the specified neighbor ids.
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	initialize() Initialize the index.
void	logStatistics() Send statistics to the logger, if enabled.

Methods inherited from class de.lmu.ifi.dbs.elki.index.preprocessed.preference.AbstractPreferenceVectorIndex

getPreferenceVector

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.index.preprocessed.preference.PreferenceVectorIndex

getPreferenceVector

Field Detail

LOG

private static final Logging LOG

Logger to use.

alpha

protected double alpha

Holds the value of parameter alpha.

k

protected int k

Holds the value of parameter k.

Constructor Detail

HiSCPreferenceVectorIndex

public HiSCPreferenceVectorIndex(Relation<V> relation,
                         double alpha,
                         int k)

Constructor.

Parameters:

relation - Relation in use

alpha - Alpha value

k - k value

Method Detail

initialize

public void initialize()

Description copied from interface: Index

Initialize the index. For static indexes, this is the moment the index is bulk loaded.

Specified by:

initialize in interface Index

determinePreferenceVector

private long[] determinePreferenceVector(Relation<V> relation,
                               DBIDRef id,
                               DBIDs neighborIDs,
                               StringBuilder msg)

Determines the preference vector according to the specified neighbor ids.

Parameters:

relation - the database storing the objects

id - the id of the object for which the preference vector should be determined

neighborIDs - the ids of the neighbors

msg - a string buffer for debug messages

Returns:

the preference vector

getLogger

protected Logging getLogger()

Description copied from class: AbstractPreprocessorIndex

Get the classes static logger.

Specified by:

getLogger in class AbstractPreprocessorIndex<V extends NumberVector,long[]>

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.

Specified by:

logStatistics in interface Index