de.lmu.ifi.dbs.elki.database.query.knn

Class LinearScanKNNQuery<O,D extends Distance<D>>

java.lang.Object

de.lmu.ifi.dbs.elki.database.query.AbstractDataBasedQuery<O>

de.lmu.ifi.dbs.elki.database.query.knn.AbstractDistanceKNNQuery<O,D>

de.lmu.ifi.dbs.elki.database.query.knn.LinearScanKNNQuery<O,D>

All Implemented Interfaces:

DatabaseQuery, KNNQuery<O,D>, LinearScanQuery

Direct Known Subclasses:

LinearScanPrimitiveDistanceKNNQuery

public class LinearScanKNNQuery<O,D extends Distance<D>>
extends AbstractDistanceKNNQuery<O,D>
implements LinearScanQuery

Instance of this query for a particular database.

Field Summary

Fields inherited from class de.lmu.ifi.dbs.elki.database.query.knn.AbstractDistanceKNNQuery

distanceQuery

Fields inherited from class de.lmu.ifi.dbs.elki.database.query.AbstractDataBasedQuery

relation

Fields inherited from interface de.lmu.ifi.dbs.elki.database.query.DatabaseQuery

HINT_BULK, HINT_EXACT, HINT_HEAVY_USE, HINT_NO_CACHE, HINT_OPTIMIZED_ONLY, HINT_SINGLE

Constructor Summary

Constructors

Constructor and Description
LinearScanKNNQuery(DistanceQuery<O,D> distanceQuery) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
List<List<DistanceResultPair<D>>>	getKNNForBulkDBIDs(ArrayDBIDs ids, int k) Bulk query method
void	getKNNForBulkHeaps(Map<DBID,KNNHeap<D>> heaps) Bulk query method configured by a map.
List<DistanceResultPair<D>>	getKNNForDBID(DBID id, int k) Get the k nearest neighbors for a particular id.
List<DistanceResultPair<D>>	getKNNForObject(O obj, int k) Get the k nearest neighbors for a particular id.
private void	linearScanBatchKNN(ArrayDBIDs ids, List<KNNHeap<D>> heaps) Linear batch knn for arbitrary distance functions.

Methods inherited from class de.lmu.ifi.dbs.elki.database.query.knn.AbstractDistanceKNNQuery

getDistanceFactory, getDistanceQuery

Methods inherited from class de.lmu.ifi.dbs.elki.database.query.AbstractDataBasedQuery

getRelation

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.database.query.knn.KNNQuery

getRelation

Constructor Detail

LinearScanKNNQuery

public LinearScanKNNQuery(DistanceQuery<O,D> distanceQuery)

Constructor.

Parameters:

distanceQuery - Distance function to use

Method Detail

linearScanBatchKNN

private void linearScanBatchKNN(ArrayDBIDs ids,
                      List<KNNHeap<D>> heaps)

Linear batch knn for arbitrary distance functions.

Parameters:

ids - DBIDs to process

heaps - Heaps to store the results in

getKNNForDBID

public List<DistanceResultPair<D>> getKNNForDBID(DBID id,
                                        int k)

Description copied from interface: KNNQuery

Get the k nearest neighbors for a particular id.

Specified by:

getKNNForDBID in interface KNNQuery<O,D extends Distance<D>>

Specified by:

getKNNForDBID in class AbstractDistanceKNNQuery<O,D extends Distance<D>>

Parameters:

id - query object ID

k - Number of neighbors requested

Returns:

neighbors

getKNNForBulkDBIDs

public List<List<DistanceResultPair<D>>> getKNNForBulkDBIDs(ArrayDBIDs ids,
                                                   int k)

Description copied from interface: KNNQuery

Bulk query method

Specified by:

getKNNForBulkDBIDs in interface KNNQuery<O,D extends Distance<D>>

Parameters:

ids - query object IDs

k - Number of neighbors requested

Returns:

neighbors

getKNNForBulkHeaps

public void getKNNForBulkHeaps(Map<DBID,KNNHeap<D>> heaps)

Description copied from interface: KNNQuery

Bulk query method configured by a map. Warning: this API is not optimal, and might be removed soon (in fact, it is used in a single place)

Specified by:

getKNNForBulkHeaps in interface KNNQuery<O,D extends Distance<D>>

Parameters:

heaps - Map of heaps to fill.

getKNNForObject

public List<DistanceResultPair<D>> getKNNForObject(O obj,
                                          int k)

Description copied from interface: KNNQuery

Get the k nearest neighbors for a particular id.

Specified by:

getKNNForObject in interface KNNQuery<O,D extends Distance<D>>

Specified by:

getKNNForObject in class AbstractDistanceKNNQuery<O,D extends Distance<D>>

Parameters:

obj - Query object

k - Number of neighbors requested

Returns:

neighbors