org.terrier.matching.models.basicmodel
Class PL

java.lang.Object
  org.terrier.matching.models.basicmodel.BasicModel
      org.terrier.matching.models.basicmodel.P
          org.terrier.matching.models.basicmodel.PL

All Implemented Interfaces:

java.io.Serializable

public class PL
extends P

This class implements the PL weighting model.

Since:

3.0

Author:

Gianni Amati, Ben He, Vassilis Plachouras

See Also:

Serialized Form

Field Summary

Fields inherited from class org.terrier.matching.models.basicmodel.P

modelName

Fields inherited from class org.terrier.matching.models.basicmodel.BasicModel

i, numberOfDocuments, numberOfTokens

Constructor Summary

PL()

Method Summary

java.lang.String	getInfo() Returns the name of the model.
double	score(double tf, double documentFrequency, double F_t, double keyFrequency, double documentLength) This method provides the contract for implementing weighting models.

Methods inherited from class org.terrier.matching.models.basicmodel.BasicModel

setNumberOfDocuments, setNumberOfTokens, stirlingPower

Methods inherited from class java.lang.Object

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

Constructor Detail

PL

public PL()

Method Detail

score

public double score(double tf,
                    double documentFrequency,
                    double F_t,
                    double keyFrequency,
                    double documentLength)

Description copied from class: P

This method provides the contract for implementing weighting models.

Overrides:

score in class P

Parameters:

tf - The term frequency in the document

documentFrequency - The document frequency of the term

F_t - the term frequency in the collection

keyFrequency - The normalised query term frequency.

documentLength - The length of the document.

Returns:

the score returned by the implemented weighting model.

getInfo

public java.lang.String getInfo()

Description copied from class: P

Returns the name of the model.

Overrides:

getInfo in class P

Returns:

the name of the model