org.openimaj.lsh.functions

Class RandomisedHashFunctionFactory<OBJECT>

java.lang.Object

org.openimaj.lsh.functions.RandomisedHashFunctionFactory<OBJECT>

Type Parameters:

OBJECT - type of object being hashed

All Implemented Interfaces:

HashFunctionFactory<OBJECT>

Direct Known Subclasses:

ByteHashFunctionFactory, DoubleHashFunctionFactory, FloatHashFunctionFactory, IntHashFunctionFactory, LongHashFunctionFactory, ShortHashFunctionFactory

public abstract class RandomisedHashFunctionFactory<OBJECT>
extends Object
implements HashFunctionFactory<OBJECT>

A factory for producing RandomisedHashFunctions.

Author:

Jonathon Hare (jsh2@ecs.soton.ac.uk)

Field Summary

Fields

Modifier and Type	Field and Description
protected int	ndims
protected cern.jet.random.engine.MersenneTwister	rng

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	RandomisedHashFunctionFactory(int ndims, cern.jet.random.engine.MersenneTwister rng) * @param ndims number of dimensions of data

Method Summary

Modifier and Type	Method and Description
abstract DistanceComparator<OBJECT>	distanceFunction()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.openimaj.util.hash.HashFunctionFactory

create

Field Detail

rng

protected cern.jet.random.engine.MersenneTwister rng

ndims

protected int ndims

Constructor Detail

RandomisedHashFunctionFactory

protected RandomisedHashFunctionFactory(int ndims,
                                        cern.jet.random.engine.MersenneTwister rng)

* @param ndims number of dimensions of data

Parameters:

rng - the random number generator

Method Detail

distanceFunction

public abstract DistanceComparator<OBJECT> distanceFunction()

Returns:

a distance comparator that produces distances of the type approximated by this hashing scheme