- java.lang.Object
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- org.apache.lucene.search.similarities.AfterEffect
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- Direct Known Subclasses:
AfterEffectB
,AfterEffectL
public abstract class AfterEffect extends java.lang.Object
This class acts as the base class for the implementations of the first normalization of the informative content in the DFR framework. This component is also called the after effect and is defined by the formula Inf2 = 1 - Prob2, where Prob2 measures the information gain.- See Also:
DFRSimilarity
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Constructor Summary
Constructors Constructor Description AfterEffect()
Sole constructor.
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description abstract Explanation
explain(BasicStats stats, double tfn)
Returns an explanation for the score.abstract double
scoreTimes1pTfn(BasicStats stats)
Returns the product of the after effect with1+tfn
.abstract java.lang.String
toString()
Subclasses must override this method to return the code of the after effect formula.
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Method Detail
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scoreTimes1pTfn
public abstract double scoreTimes1pTfn(BasicStats stats)
Returns the product of the after effect with1+tfn
. This may not depend on the value oftfn
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explain
public abstract Explanation explain(BasicStats stats, double tfn)
Returns an explanation for the score.
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toString
public abstract java.lang.String toString()
Subclasses must override this method to return the code of the after effect formula. Refer to the original paper for the list.- Overrides:
toString
in classjava.lang.Object
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