dragon.ir.search.smooth

Class OkapiSmoother

java.lang.Object

dragon.ir.search.smooth.AbstractSmoother

dragon.ir.search.smooth.OkapiSmoother

All Implemented Interfaces:

Smoother

public class OkapiSmoother
extends AbstractSmoother

Okapi Smoother

Copyright: Copyright (c) 2005

Company: IST, Drexel University

Version:

1.0

Author:

Davis Zhou

Field Summary

Fields inherited from class dragon.ir.search.smooth.AbstractSmoother

docFirstOptimal, querytermFirstOptimal, queryWeight, useLog

Constructor Summary

Constructors

Constructor and Description
OkapiSmoother(IRCollection collection)
OkapiSmoother(IRCollection collection, double bm25k1, double bm25b)

Method Summary

Modifier and Type	Method and Description
protected double	computeSmoothedProb(int termFrequency)
void	setDoc(IRDoc doc) Set the current document for processing
boolean	setParameters(double[] params)
void	setQueryTerm(SimpleTermPredicate queryTerm) Set the current query term for processing

Methods inherited from class dragon.ir.search.smooth.AbstractSmoother

getLogLikelihoodOption, getProb, getSmoothedProb, getSmoothedProb, getSmoothedProb, getSmoothedProb, getSmoothedProb, getSmoothedProb, getSmoothedProb, isDocFirstOptimal, isQueryTermFirstOptimal, setLogLikelihoodOption

Methods inherited from class java.lang.Object

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

Constructor Detail

OkapiSmoother

public OkapiSmoother(IRCollection collection)

OkapiSmoother

public OkapiSmoother(IRCollection collection,
                     double bm25k1,
                     double bm25b)

Method Detail

setParameters

public boolean setParameters(double[] params)

Parameters:

params - paramteres for the current smoother

Returns:

true if successful

setQueryTerm

public void setQueryTerm(SimpleTermPredicate queryTerm)

Description copied from interface: Smoother

Set the current query term for processing

Parameters:

queryTerm - the query term

setDoc

public void setDoc(IRDoc doc)

Description copied from interface: Smoother

Set the current document for processing

Parameters:

doc - the document

computeSmoothedProb

protected double computeSmoothedProb(int termFrequency)

Specified by:

computeSmoothedProb in class AbstractSmoother