de.lmu.ifi.dbs.elki.index.lsh.hashfunctions

Interface LocalitySensitiveHashFunction<V>

Type Parameters:

V - Data type to hash.

All Known Implementing Classes:

CosineLocalitySensitiveHashFunction, MultipleProjectionsLocalitySensitiveHashFunction

public interface LocalitySensitiveHashFunction<V>

Hash functions as used by locality sensitive hashing.

Author:

Erich Schubert

Method Summary

Methods

Modifier and Type	Method and Description
int	getNumberOfProjections() Get the number of projections performed.
int	hashObject(V obj) Compute the hash value of an object.
int	hashObject(V obj, double[] buf) Compute the hash value of an object (faster version).

Method Detail

hashObject

int hashObject(V obj)

Compute the hash value of an object.

Parameters:

obj - Object to hash

Returns:

Hash value

hashObject

int hashObject(V obj,
             double[] buf)

Compute the hash value of an object (faster version).

Parameters:

obj - Object to hash

buf - Buffer, sized according to the number of projections.

Returns:

Hash value

getNumberOfProjections

int getNumberOfProjections()

Get the number of projections performed.

Returns:

Number of projections.