edu.udo.cs.yale.example
Class Partition

java.lang.Object
  edu.udo.cs.yale.example.Partition

All Implemented Interfaces:

java.lang.Cloneable

public class Partition
extends java.lang.Object
implements java.lang.Cloneable

Implements a partition. A partition is used to divide an example set into different parts of arbitrary sizes without actually make a copy of the data. Partitions are used by SplittedExampleSets. Partition numbering starts at 0.

Version:

$Id: Partition.java,v 2.19 2006/08/03 14:39:27 ingomierswa Exp $

Author:

Simon Fischer, Ingo Mierswa

Field Summary

private boolean[]	mask Mask for the selected partitions.
private int[]	partitionSizes Size of the individual partitions.
private int[]	splitPartition Maps every example to its partition index.
private int[]	tableIndexMap Maps every example index to the true index of the data row in the example table.

Constructor Summary

	Partition(double[] ratio, int size, PartitionBuilder builder) Creates a new partition of a given size consisting of ratio.length sets.
	Partition(int[] splitPartition, int numberOfPartitions) Creates a partition from the given one.
	Partition(int noPartitions, int size, PartitionBuilder builder) Creates a new partition of a given size consisting of noPartitions equally sized sets.
private	Partition(Partition p) Clone constructor.

Method Summary

void	clearSelection() Clears the selection, i.e. deselects all subsets.
java.lang.Object	clone()
void	deselectSubset(int i) Marks the given subset as deselected.
int	getNumberOfSubsets() Returns the number of subsets.
int	getSelectionSize() Returns the number of selected elements.
int	getTotalSize() Returns the total number of examples.
private void	init(double[] ratio, int size, PartitionBuilder builder) Creates a partition from the given ratios.
private void	init(int[] elements, int noOfPartitions) Private initialization method used by constructors.
void	invertSelection()
boolean	isSelected(int index) Returns true iff the example with the given index is selected according to the current selection mask.
int	mapIndex(int index) Returns the actual example table index of the i-th example of the currently selected subset.
private void	recalculateTableIndices() Recalculates the example table indices of the currently selected examples.
void	selectSubset(int i) Marks the given subset as selected.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

mask

private boolean[] mask

Mask for the selected partitions.

partitionSizes

private int[] partitionSizes

Size of the individual partitions.

splitPartition

private int[] splitPartition

Maps every example to its partition index.

tableIndexMap

private int[] tableIndexMap

Maps every example index to the true index of the data row in the example table.

Constructor Detail

Partition

public Partition(double[] ratio,
                 int size,
                 PartitionBuilder builder)

Creates a new partition of a given size consisting of ratio.length sets. The set i will be of size of size x ratio[i], i.e. the sum of all ratio[i] must be 1. Initially all partitions are selected.

Partition

public Partition(int noPartitions,
                 int size,
                 PartitionBuilder builder)

Creates a new partition of a given size consisting of noPartitions equally sized sets. Initially all partitions are selected.

Partition

public Partition(int[] splitPartition,
                 int numberOfPartitions)

Creates a partition from the given one. Partition numbering starts at 0.

Partition

private Partition(Partition p)

Clone constructor.

Method Detail

init

private void init(double[] ratio,
                  int size,
                  PartitionBuilder builder)

Creates a partition from the given ratios. The partition builder is used for creation.

init

private void init(int[] elements,
                  int noOfPartitions)

Private initialization method used by constructors.

clearSelection

public void clearSelection()

Clears the selection, i.e. deselects all subsets.

invertSelection

public void invertSelection()

selectSubset

public void selectSubset(int i)

Marks the given subset as selected.

deselectSubset

public void deselectSubset(int i)

Marks the given subset as deselected.

getNumberOfSubsets

public int getNumberOfSubsets()

Returns the number of subsets.

getSelectionSize

public int getSelectionSize()

Returns the number of selected elements.

getTotalSize

public int getTotalSize()

Returns the total number of examples.

isSelected

public boolean isSelected(int index)

Returns true iff the example with the given index is selected according to the current selection mask.

recalculateTableIndices

private void recalculateTableIndices()

Recalculates the example table indices of the currently selected examples.

mapIndex

public int mapIndex(int index)

Returns the actual example table index of the i-th example of the currently selected subset.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

clone

public java.lang.Object clone()

Overrides:

clone in class java.lang.Object