Class DistributionSPL
- java.lang.Object
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- org.apache.lucene.search.similarities.Distribution
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- org.apache.lucene.search.similarities.DistributionSPL
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public class DistributionSPL extends Distribution
The smoothed power-law (SPL) distribution for the information-based framework that is described in the original paper.Unlike for DFR, the natural logarithm is used, as it is faster to compute and the original paper does not express any preference to a specific base. WARNING: this model currently returns infinite scores for very small tf values and negative scores for very large tf values
- WARNING: This API is experimental and might change in incompatible ways in the next release.
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Constructor Summary
Constructors Constructor Description DistributionSPL()
Sole constructor: parameter-free
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description double
score(BasicStats stats, double tfn, double lambda)
Computes the score.String
toString()
Subclasses must override this method to return the name of the distribution.-
Methods inherited from class org.apache.lucene.search.similarities.Distribution
explain
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Method Detail
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score
public final double score(BasicStats stats, double tfn, double lambda)
Description copied from class:Distribution
Computes the score.- Specified by:
score
in classDistribution
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toString
public String toString()
Description copied from class:Distribution
Subclasses must override this method to return the name of the distribution.- Specified by:
toString
in classDistribution
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