org.openimaj.lsh.functions

Class DoubleCauchyFactory

java.lang.Object

org.openimaj.lsh.functions.RandomisedHashFunctionFactory<double[]>

org.openimaj.lsh.functions.DoubleHashFunctionFactory

org.openimaj.lsh.functions.DoublePStableFactory

org.openimaj.lsh.functions.DoubleCauchyFactory

All Implemented Interfaces:

HashFunctionFactory<double[]>

public class DoubleCauchyFactory
extends DoublePStableFactory

A hash function factory for producing hash functions that use a Cauchy distribution to approximate L1 distance.

Author:

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

Nested Class Summary

Nested classes/interfaces inherited from class org.openimaj.lsh.functions.DoublePStableFactory

DoublePStableFactory.PStableFunction

Field Summary

Fields inherited from class org.openimaj.lsh.functions.RandomisedHashFunctionFactory

ndims, rng

Constructor Summary

Constructors

Constructor and Description
DoubleCauchyFactory(int ndims, cern.jet.random.engine.MersenneTwister rng, double w) Construct the factory with the given parameters.

Method Summary

Modifier and Type	Method and Description
org.openimaj.lsh.functions.DoubleCauchyFactory.Function	create() Construct a new HashFunction.
protected DoubleFVComparison	fvDistanceFunction()

Methods inherited from class org.openimaj.lsh.functions.DoubleHashFunctionFactory

distanceFunction

Methods inherited from class java.lang.Object

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

Constructor Detail

DoubleCauchyFactory

public DoubleCauchyFactory(int ndims,
                           cern.jet.random.engine.MersenneTwister rng,
                           double w)

Construct the factory with the given parameters.

Parameters:

ndims - number of dimensions of the data

rng - the random number generator

w - the width parameter

Method Detail

create

public org.openimaj.lsh.functions.DoubleCauchyFactory.Function create()

Description copied from interface: HashFunctionFactory

Construct a new HashFunction.

Returns:

the new HashFunction

fvDistanceFunction

protected DoubleFVComparison fvDistanceFunction()

Specified by:

fvDistanceFunction in class DoubleHashFunctionFactory