Package generic.lsh.vector

Class WeightedLSHCosineVectorFactory

java.lang.Object

generic.lsh.vector.LSHVectorFactory

generic.lsh.vector.WeightedLSHCosineVectorFactory

public class WeightedLSHCosineVectorFactory
extends LSHVectorFactory

Field Summary

Fields inherited from class generic.lsh.vector.LSHVectorFactory

idfLookup, settings, weightFactory

Constructor Summary

Constructors

Constructor	Description
WeightedLSHCosineVectorFactory()

Method Summary

Modifier and Type	Method	Description
LSHVector	buildVector(int[] feature)	Generate an LSHVector from a feature set, individual features are integer hashes.
LSHVector	buildZeroVector()	Generate vector with all coefficients zero.
LSHVector	restoreVectorFromSql(java.lang.String sql)	Generate an LSHVector based on string returned from SQL query Factory generates weights based on term frequency info in the string and its internal IDF knowledge
LSHVector	restoreVectorFromXml(XmlPullParser parser)	Generate an LSHVector based on XML tag seen by pull parser.

Methods inherited from class generic.lsh.vector.LSHVectorFactory

calculateSignificance, getSelfSignificance, getSettings, getSignificanceAddend, getSignificanceScale, isLoaded, readWeights, set

Methods inherited from class java.lang.Object

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

Constructor Detail

WeightedLSHCosineVectorFactory

public WeightedLSHCosineVectorFactory()

Method Detail

buildZeroVector

public LSHVector buildZeroVector()

Description copied from class: LSHVectorFactory

Generate vector with all coefficients zero.

Specified by:

buildZeroVector in class LSHVectorFactory

Returns:

the zero vector

buildVector

public LSHVector buildVector(int[] feature)

Description copied from class: LSHVectorFactory

Generate an LSHVector from a feature set, individual features are integer hashes. The integers MUST already be sorted. The same integer can occur more than once in the array (term frequency (TF) > 1). The factory decides internally how to create weights based on term frequency and any knowledge of Inverse Document Frequency (IDF)

Specified by:

buildVector in class LSHVectorFactory

Parameters:

feature - is the sorted array of integer features

Returns:

the newly minted LSHVector

restoreVectorFromXml

public LSHVector restoreVectorFromXml(XmlPullParser parser)

Description copied from class: LSHVectorFactory

Generate an LSHVector based on XML tag seen by pull parser. Factory generates weights based on term frequency info in the XML tag and its internal IDF knowledge

Specified by:

restoreVectorFromXml in class LSHVectorFactory

Parameters:

parser - is the XML parser

Returns:

the newly minted LSHVector

restoreVectorFromSql

public LSHVector restoreVectorFromSql(java.lang.String sql)
                               throws java.io.IOException

Description copied from class: LSHVectorFactory

Generate an LSHVector based on string returned from SQL query Factory generates weights based on term frequency info in the string and its internal IDF knowledge

Specified by:

restoreVectorFromSql in class LSHVectorFactory

Parameters:

sql - is the column data string returned by an SQL query

Returns:

the newly minted LSHVector

Throws:

java.io.IOException