Class BasicModelBE
- java.lang.Object
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- org.apache.lucene.search.similarities.BasicModel
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- org.apache.lucene.search.similarities.BasicModelBE
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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 bytfn+1
andN
is increased byF
- 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 or infinite scores with
Normalizations that return large or small values for
tfn
such as NormalizationH3. Consider using the geometric approximation (BasicModelG
) instead, which provides the same relevance but with less practical problems.
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Constructor Summary
Constructors Constructor Description BasicModelBE()
Sole constructor: parameter-free
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description 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 org.apache.lucene.search.similarities.BasicModel
explain
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Method Detail
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score
public final float score(BasicStats stats, float tfn)
Description copied from class:BasicModel
Returns the informative content score.- Specified by:
score
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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