Package org.terrier.matching.models

Class DFReeKLIM

java.lang.Object

org.terrier.matching.models.WeightingModel

org.terrier.matching.models.DFReeKLIM

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, Model

public class DFReeKLIM
extends WeightingModel

This class implements the DFReeKLIM weighting model. DFReeKLIM stands for a DFR model free from parameters. DFReeKLIM is the inner product of two KL Information Measures. Appeared in the paper: FUB, IASI-CNR, UNIVAQ at Microblogging Track of TREC 2011 G. Amati, G. Amodeo, M. Bianchi, G. Marcone, Fondazione Ugo Bordoni G.Amodeo, C. Gaibisso, G. Gambosi, IASI-CNR A. Celi, C. De Nicola, M. Flammini, Univ. dell' Aquila

Since:

4.0

See Also:

Serialized Form

Field Summary

Fields inherited from class org.terrier.matching.models.WeightingModel

averageDocumentLength, c, cs, documentFrequency, es, i, keyFrequency, numberOfDocuments, numberOfPointers, numberOfPostings, numberOfTokens, numberOfUniqueTerms, rq, termFrequency

Constructor Summary

Constructors

Constructor	Description
DFReeKLIM()	A default constructor to make this model.
DFReeKLIM(double c)

Method Summary

Modifier and Type	Method	Description
java.lang.String	getInfo()	Returns the name of the model, in this case "DFReeKLIM"
double	score(double tf, double docLength)	Uses DFReeKLIM to compute a weight for a term in a document.
double	score(double tf, double docLength, double documentFrequency, double termFrequency, double keyFrequency)	Uses DFReeKLIM to compute a weight for a term in a document.

Methods inherited from class org.terrier.matching.models.WeightingModel

clone, getOverflowed, getParameter, prepare, score, setCollectionStatistics, setEntryStatistics, setKeyFrequency, setParameter, setRequest

Methods inherited from class java.lang.Object

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

Constructor Detail

DFReeKLIM

public DFReeKLIM()

A default constructor to make this model.

DFReeKLIM

public DFReeKLIM(double c)

Method Detail

getInfo

public final java.lang.String getInfo()

Returns the name of the model, in this case "DFReeKLIM"

Specified by:

getInfo in interface Model

Specified by:

getInfo in class WeightingModel

Returns:

the name of the model

score

public final double score(double tf,
                          double docLength)

Uses DFReeKLIM to compute a weight for a term in a document.

Specified by:

score in class WeightingModel

Parameters:

tf - The term frequency of the term in the document

docLength - the document's length

Returns:

the score assigned to a document with the given tf and docLength, and other preset parameters

score

public final double score(double tf,
                          double docLength,
                          double documentFrequency,
                          double termFrequency,
                          double keyFrequency)

Uses DFReeKLIM to compute a weight for a term in a document.

Parameters:

tf - The term frequency of the term in the document

docLength - the document's length

documentFrequency - The document frequency of the term (ignored)

termFrequency - the term frequency in the collection (ignored)

keyFrequency - the term frequency in the query (ignored).

Returns:

the score assigned by the weighting model DFReeKLIM.