is2.data

Class RandomIndex

java.lang.Object

is2.data.RandomIndex

All Implemented Interfaces:

Long2IntInterface

public class RandomIndex
extends Object
implements Long2IntInterface

Author:

Dr. Bernd Bohnet, 20.05.2011

Constructor Summary

Constructors

Constructor and Description
RandomIndex(int kbit, int lbit, int hsize, int numberFunctions) Creates the random functions.

Method Summary

Methods

Modifier and Type	Method and Description
int[]	hash(long x)
int[]	hashU(long x)
int	l2i(long l) Maps a long to a integer value.
int	size()

Methods inherited from class java.lang.Object

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

Constructor Detail

RandomIndex

public RandomIndex(int kbit,
           int lbit,
           int hsize,
           int numberFunctions)

Creates the random functions.

Parameters:

kbit - The bits to be mapped

lbit - The left shift of the bits

hsize - The size of the featurs space (not included in the original algorithm)

numberFunctions - The number of the hash functions

Method Detail

hash

public int[] hash(long x)

hashU

public int[] hashU(long x)

l2i

public int l2i(long l)

Description copied from interface: Long2IntInterface

Maps a long to a integer value. This is very useful to save memory for sparse data long values

Specified by:

l2i in interface Long2IntInterface

Returns:

the integer

size

public int size()

Specified by:

size in interface Long2IntInterface