org.openimaj.lsh.functions

Class DoubleHashFunction

java.lang.Object

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

org.openimaj.lsh.functions.DoubleHashFunction

All Implemented Interfaces:

org.openimaj.util.hash.HashFunction<double[]>

Direct Known Subclasses:

DoublePStableFactory.PStableFunction

public abstract class DoubleHashFunction
extends RandomisedHashFunction<double[]>

Base RandomisedHashFunction for hashing double arrays.

Author:

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

Field Summary

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

random

Method Summary

Modifier and Type	Method and Description
int	computeHashCode(DoubleFV feature) Compute the hash code for the feature vector.
int	computeHashCode(org.openimaj.util.array.SparseDoubleArray array) Compute the hash code for the sparse array.
int	computeHashCode(SparseDoubleFV feature) Compute the hash code for the sparse feature vector.

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.HashFunction

computeHashCode

Method Detail

computeHashCode

public final int computeHashCode(DoubleFV feature)

Compute the hash code for the feature vector.

Parameters:

feature - the feature vector

Returns:

the hash code

computeHashCode

public int computeHashCode(org.openimaj.util.array.SparseDoubleArray array)

Compute the hash code for the sparse array. This method converts the sparse array to a dense one and computes the hash code from that. Subclasses should override this method for improved performance.

Parameters:

array - the sparse array

Returns:

the hash code

computeHashCode

public final int computeHashCode(SparseDoubleFV feature)

Compute the hash code for the sparse feature vector.

Parameters:

feature - the sparse feature

Returns:

the hash code