edu.ucla.sspace.index

Class GaussianVectorGenerator

java.lang.Object

edu.ucla.sspace.index.GaussianVectorGenerator

All Implemented Interfaces:

DoubleVectorGenerator<DoubleVector>, Generator<DoubleVector>, Serializable

public class GaussianVectorGenerator
extends Object
implements DoubleVectorGenerator<DoubleVector>, Serializable

A Generator for vectors where each entry is from a guassian distribution having some mean and standard deviation. This class supports the following properties:

Property: "edu.ucla.sspace.index.GuassianVectorGenerator.stdev"
Default:

This variable is the standard deviation used when generating random numbers from a gaussian distribution

Property: "edu.ucla.sspace.index.GuassianVectorGenerator.mean"
Default: "0"

This variable is the mean used for generating values from gaussian distribution for vectors

Author:

Keith Stevens

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static String	DEFAULT_MEAN
static double	DEFAULT_STANDARD_DEVIATION
static String	MEAN_PROPERTY The property for setting the standard deviation.
static String	STANDARD_DEVIATION_PROPERTY The property for setting the standard deviation.

Constructor Summary

Constructors

Constructor and Description
GaussianVectorGenerator(int indexVectorLength) Create a GaussianVectorGenerator that uses the system properties for setup.
GaussianVectorGenerator(int indexVectorLength, Properties prop) Create a GaussianVectorGenerator which uses vectorLength as the size of each generated Vector.

Method Summary

Methods

Modifier and Type	Method and Description
DoubleVector	generate() Generate a new random vector using a guassian distribution for each value.

Methods inherited from class java.lang.Object

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

Field Detail

STANDARD_DEVIATION_PROPERTY

public static final String STANDARD_DEVIATION_PROPERTY

The property for setting the standard deviation.

See Also:

Constant Field Values

MEAN_PROPERTY

public static final String MEAN_PROPERTY

The property for setting the standard deviation.

See Also:

Constant Field Values

DEFAULT_STANDARD_DEVIATION

public static final double DEFAULT_STANDARD_DEVIATION

See Also:

Constant Field Values

DEFAULT_MEAN

public static final String DEFAULT_MEAN

See Also:

Constant Field Values

Constructor Detail

GaussianVectorGenerator

public GaussianVectorGenerator(int indexVectorLength)

Create a GaussianVectorGenerator that uses the system properties for setup.

GaussianVectorGenerator

public GaussianVectorGenerator(int indexVectorLength,
                       Properties prop)

Create a GaussianVectorGenerator which uses vectorLength as the size of each generated Vector.

Parameters:

vectorLength - The length of each index and semantic Vector used in this IndexVectorGenerator.

Method Detail

generate

public DoubleVector generate()

Generate a new random vector using a guassian distribution for each value.

Specified by:

generate in interface DoubleVectorGenerator<DoubleVector>

Specified by:

generate in interface Generator<DoubleVector>

Returns:

an index vector