Class BasicModelBE

  extended by
      extended by

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

WARNING: This API is experimental and might change in incompatible ways in the next release.
NOTE: in some corner cases this model may give poor performance with Normalizations that return large values for tfn such as NormalizationH3. Consider using the geometric approximation (BasicModelG) instead, which provides the same relevance but with less practical problems.

Constructor Summary
          Sole constructor: parameter-free
Method Summary
 float score(BasicStats stats, float tfn)
          Returns the informative content score.
 String toString()
          Subclasses must override this method to return the code of the basic model formula.
Methods inherited from class
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail


public BasicModelBE()
Sole constructor: parameter-free

Method Detail


public final float score(BasicStats stats,
                         float tfn)
Description copied from class: BasicModel
Returns the informative content score.

Specified by:
score in class BasicModel


public 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

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