Class BasicModelG
- java.lang.Object
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- org.apache.lucene.search.similarities.BasicModel
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- org.apache.lucene.search.similarities.BasicModelG
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public class BasicModelG extends BasicModel
Geometric as limiting form of the Bose-Einstein model. The formula used in Lucene differs slightly from the one in the original paper:F
is increased by1
andN
is increased byF
.- WARNING: This API is experimental and might change in incompatible ways in the next release.
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Constructor Summary
Constructors Constructor Description BasicModelG()
Sole constructor: parameter-free
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Explanation
explain(BasicStats stats, double tfn, double aeTimes1pTfn)
Returns an explanation for the score.double
score(BasicStats stats, double tfn, double aeTimes1pTfn)
Returns the informative content score combined with the after effect, more specificallyinformationContentScore * aeTimes1pTfn / (1 + tfn)
.String
toString()
Subclasses must override this method to return the code of the basic model formula.
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Method Detail
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score
public final double score(BasicStats stats, double tfn, double aeTimes1pTfn)
Description copied from class:BasicModel
Returns the informative content score combined with the after effect, more specificallyinformationContentScore * aeTimes1pTfn / (1 + tfn)
. This function must be non-decreasing withtfn
.- Specified by:
score
in classBasicModel
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explain
public Explanation explain(BasicStats stats, double tfn, double aeTimes1pTfn)
Description copied from class:BasicModel
Returns an explanation for the score. Subclasses must override this method.- Specified by:
explain
in classBasicModel
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toString
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 classBasicModel
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