fr.univnantes.termsuite.engines.contextualizer

Class Contextualizer

java.lang.Object

fr.univnantes.termsuite.framework.Engine

fr.univnantes.termsuite.engines.SimpleEngine

fr.univnantes.termsuite.engines.contextualizer.Contextualizer

public class Contextualizer
extends SimpleEngine

An engine that index TermOccurrences within Documents so as to make method TermOccurrence#getContext() invokable.

Field Summary

Fields inherited from class fr.univnantes.termsuite.engines.SimpleEngine

history, terminology

Fields inherited from class fr.univnantes.termsuite.framework.Engine

pipelineService

Constructor Summary

Constructors

Constructor and Description
Contextualizer()

Method Summary

Modifier and Type	Method and Description
ContextData	computeContextData(CrossTable crossTable, Term x, Term y) Computes coefficients a, b, c and d (available) and computes the association rate based on these coefficients.
CrossTable	computeCrossTable()
void	computeDocumentViews()
java.util.Iterator<java.util.Iterator<TermOccurrence>>	contextIterator(Term t, int contextSize)
AssociationRate	createAssocRate()
void	execute()
long	setContexts()
void	toAssocRateVector(Term t, CrossTable table, AssociationRate assocRateFunction, boolean normalize) Normalize this vector according to a cross table and an association rate measure.

Methods inherited from class fr.univnantes.termsuite.framework.Engine

getEngineName

Methods inherited from class java.lang.Object

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

Constructor Detail

Contextualizer

public Contextualizer()

Method Detail

execute

public void execute()

Specified by:

execute in class SimpleEngine

setContexts

public long setContexts()

computeDocumentViews

public void computeDocumentViews()

createAssocRate

public AssociationRate createAssocRate()

toAssocRateVector

public void toAssocRateVector(Term t,
                              CrossTable table,
                              AssociationRate assocRateFunction,
                              boolean normalize)

Normalize this vector according to a cross table and an association rate measure. This method recomputes all ContextVector.Entry.frequency values with the normalized ones.

Parameters:

contextVector -

table - the pre-computed co-occurrences CrossTable

assocRateFunction - the AssociationRate measure implementation

normalize -

computeContextData

public ContextData computeContextData(CrossTable crossTable,
                                      Term x,
                                      Term y)

Computes coefficients a, b, c and d (available) and computes the association rate based on these coefficients. These coefficients are made available through the not-thread safe methods #getLastX().

Parameters:

x - the base term

y - the co term

Returns:

the association rate

contextIterator

public java.util.Iterator<java.util.Iterator<TermOccurrence>> contextIterator(Term t,
                                                                              int contextSize)

computeCrossTable

public CrossTable computeCrossTable()