Package elki.index.tree.spatial.rstarvariants.strategies.bulk

Class MaxExtensionSortTileRecursiveBulkSplit

java.lang.Object

elki.index.tree.spatial.rstarvariants.strategies.bulk.AbstractBulkSplit

elki.index.tree.spatial.rstarvariants.strategies.bulk.MaxExtensionSortTileRecursiveBulkSplit

All Implemented Interfaces:

BulkSplit

public class MaxExtensionSortTileRecursiveBulkSplit
extends AbstractBulkSplit

This is variation of the SortTileRecursiveBulkSplit, incorporating some ideas from MaxExtensionBulkSplit. Instead of iterating through the axes in order, it always chooses the axis with the largest extend. This may rarely lead to the data being split on the same axis twice, but most importantly it varies the splitting order compared to STR. AdaptiveSortTileRecursiveBulkSplit takes these ideas one step further, by also varying the fan-out degree.

Since:

0.6.0

Author:

Erich Schubert

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	MaxExtensionSortTileRecursiveBulkSplit.Par	Parameterization class.

Field Summary

Fields

Modifier and Type	Field	Description
static MaxExtensionSortTileRecursiveBulkSplit	STATIC	Static instance.

Constructor Summary

Constructors

Constructor	Description
MaxExtensionSortTileRecursiveBulkSplit()

Method Summary

Modifier and Type	Method	Description
<T extends elki.data.spatial.SpatialComparable> java.util.List<java.util.List<T>>	partition(java.util.List<T> spatialObjects, int minEntries, int maxEntries)	Partitions the specified feature vectors
protected <T extends elki.data.spatial.SpatialComparable> void	strPartition(java.util.List<T> objs, int start, int end, int depth, int dims, int maxEntries, elki.data.spatial.SpatialSingleMeanComparator c, java.util.List<java.util.List<T>> ret)	Recursively partition.

Methods inherited from class elki.index.tree.spatial.rstarvariants.strategies.bulk.AbstractBulkSplit

chooseBulkSplitPoint, trivialPartition

Methods inherited from class java.lang.Object

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

Field Detail

STATIC

public static final MaxExtensionSortTileRecursiveBulkSplit STATIC

Static instance.

Constructor Detail

MaxExtensionSortTileRecursiveBulkSplit

public MaxExtensionSortTileRecursiveBulkSplit()

Method Detail

partition

public <T extends elki.data.spatial.SpatialComparable> java.util.List<java.util.List<T>> partition(java.util.List<T> spatialObjects,
                                                                                                   int minEntries,
                                                                                                   int maxEntries)

Description copied from interface: BulkSplit

Partitions the specified feature vectors

Type Parameters:

T - actual type we split

Parameters:

spatialObjects - the spatial objects to be partitioned

minEntries - the minimum number of entries in a partition

maxEntries - the maximum number of entries in a partition

Returns:

the partition of the specified spatial objects

strPartition

protected <T extends elki.data.spatial.SpatialComparable> void strPartition(java.util.List<T> objs,
                                                                            int start,
                                                                            int end,
                                                                            int depth,
                                                                            int dims,
                                                                            int maxEntries,
                                                                            elki.data.spatial.SpatialSingleMeanComparator c,
                                                                            java.util.List<java.util.List<T>> ret)

Recursively partition.

Type Parameters:

T - data type

Parameters:

objs - Object list

start - Subinterval start

end - Subinterval end

depth - Iteration depth (must be less than dimensionality!)

dims - Total number of dimensions

maxEntries - Maximum page size

c - Comparison helper

ret - Output list