org.apache.lucene.search.similarities

Class BasicModelBE

java.lang.Object

org.apache.lucene.search.similarities.BasicModel

org.apache.lucene.search.similarities.BasicModelBE

public class BasicModelBE
extends BasicModel

Limiting form of the Bose-Einstein model. The formula used in Lucene differs slightly from the one in the original paper: F is increased by tfn+1 and N is increased by F

Constructor Summary

Constructors

Constructor and Description
BasicModelBE() Sole constructor: parameter-free

Method Summary

Modifier and Type	Method and Description
private double	f(double n, double m) The f helper function defined for BE.
float	score(BasicStats stats, float tfn) Returns the informative content score.
java.lang.String	toString() Subclasses must override this method to return the code of the basic model formula.

Methods inherited from class org.apache.lucene.search.similarities.BasicModel

explain

Methods inherited from class java.lang.Object

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

Constructor Detail

BasicModelBE

public BasicModelBE()

Sole constructor: parameter-free

Method Detail

score

public final float score(BasicStats stats,
                         float tfn)

Description copied from class: BasicModel

Returns the informative content score.

Specified by:

score in class BasicModel

f

private final double f(double n,
                       double m)

The f helper function defined for B_E.

toString

public java.lang.String toString()

Description copied from class: BasicModel

Subclasses must override this method to return the code of the basic model formula. Refer to the original paper for the list.

Specified by:

toString in class BasicModel