org.openimaj.lsh.functions

Class DoubleHashFunctionFactory

java.lang.Object

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

org.openimaj.lsh.functions.DoubleHashFunctionFactory

All Implemented Interfaces:

HashFunctionFactory<double[]>

Direct Known Subclasses:

DoubleHammingFactory, DoubleHyperplaneCosineFactory, DoubleHyperplaneL1Factory, DoublePStableFactory

public abstract class DoubleHashFunctionFactory
extends RandomisedHashFunctionFactory<double[]>

Base RandomisedHashFunction for producing hash functions seeded by random numbers.

Author:

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

Field Summary

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

ndims, rng

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	DoubleHashFunctionFactory(int ndims, cern.jet.random.engine.MersenneTwister rng)

Method Summary

Modifier and Type	Method and Description
DistanceComparator<double[]>	distanceFunction()
protected abstract DoubleFVComparison	fvDistanceFunction()

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

Constructor Detail

DoubleHashFunctionFactory

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

Method Detail

fvDistanceFunction

protected abstract DoubleFVComparison fvDistanceFunction()

distanceFunction

public final DistanceComparator<double[]> distanceFunction()

Specified by:

distanceFunction in class RandomisedHashFunctionFactory<double[]>

Returns:

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