net.semanticmetadata.lire.indexers.hashing

类 BitSampling

java.lang.Object

net.semanticmetadata.lire.indexers.hashing.BitSampling

public class BitSampling
extends java.lang.Object

Provides a simple way to hashing. It's bit sampling and can be put into the locality sensitive hashing family of hashing functions.

Created: 24.02.12, 14:00

作者:

Mathias Lux, mathias@juggle.at

字段概要

字段

限定符和类型	字段和说明
static int	dimensions
static java.lang.String	hashFunctionsFileName
static int	numFunctionBundles
static double	w

构造器概要

构造器

构造器和说明
BitSampling()

方法概要

限定符和类型	方法和说明
static int[]	generateHashes(double[] histogram) Generates and returns the hashes for a given histogram input.
static void	generateHashFunctions() Writes a file to disk to be read for hashing.
static void	generateHashFunctions(java.lang.String hashFunctionsFileName)
static int	getBits()
static int	getNumFunctionBundles()
static double	getW()
static void	main(java.lang.String[] args) Generate new hash functions.
static double[][][]	readHashFunctions() Reads a file from disk, where the hash bundles are specified.
static double[][][]	readHashFunctions(java.io.InputStream inputStream) Reads a file from a given InputStream, where the hash bundles are specified.
static void	setBits(int bits)
static void	setNumFunctionBundles(int numFunctionBundles)
static void	setW(double w)

从类继承的方法 java.lang.Object

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

字段详细资料

w

public static double w

numFunctionBundles

public static int numFunctionBundles

dimensions

public static int dimensions

hashFunctionsFileName

public static final java.lang.String hashFunctionsFileName

另请参阅:

常量字段值

构造器详细资料

BitSampling

public BitSampling()

方法详细资料

main

public static void main(java.lang.String[] args)

Generate new hash functions.

参数:

args -

generateHashFunctions

public static void generateHashFunctions()
                                  throws java.io.IOException

Writes a file to disk to be read for hashing.

抛出:

java.io.IOException

generateHashFunctions

public static void generateHashFunctions(java.lang.String hashFunctionsFileName)
                                  throws java.io.IOException

抛出:

java.io.IOException

readHashFunctions

public static double[][][] readHashFunctions()
                                      throws java.io.IOException

Reads a file from disk, where the hash bundles are specified. Make sure to generate it first and make sure to re-use it for search. This method reads the in class specified file relative to the execution directory.

返回:

抛出:

java.io.IOException

readHashFunctions

public static double[][][] readHashFunctions(java.io.InputStream inputStream)
                                      throws java.io.IOException

Reads a file from a given InputStream, where the hash bundles are specified. Make sure to generate it first and make sure to re-use it for search.

参数:

inputStream - to access the data, most likely a File on a hard disk

返回:

抛出:

java.io.IOException

generateHashes

public static int[] generateHashes(double[] histogram)

Generates and returns the hashes for a given histogram input.

参数:

histogram -

返回:

setW

public static void setW(double w)

setNumFunctionBundles

public static void setNumFunctionBundles(int numFunctionBundles)

getBits

public static int getBits()

setBits

public static void setBits(int bits)

getW

public static double getW()

getNumFunctionBundles

public static int getNumFunctionBundles()