Package org.apache.lucene.search.similarities

Class Distribution

  • Direct Known Subclasses:
    DistributionLL, DistributionSPL
    public abstract class Distribution
extends java.lang.Object
    The probabilistic distribution used to model term occurrence in information-based models.
    See Also:
    IBSimilarity

    • Constructor Summary

      Constructors 
      Constructor Description
      Distribution()
      Sole constructor.

    • Method Summary

      All Methods Instance Methods Abstract Methods Concrete Methods 
      Modifier and Type Method Description
      Explanation explain​(BasicStats stats, float tfn, float lambda)
      Explains the score.
      abstract float score​(BasicStats stats, float tfn, float lambda)
      Computes the score.
      abstract java.lang.String toString()
      Subclasses must override this method to return the name of the distribution.

      • Methods inherited from class java.lang.Object

        equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

    • Constructor Detail

      • Distribution

        public Distribution()
        Sole constructor. (For invocation by subclass constructors, typically implicit.)

    • Method Detail

      • score

        public abstract float score​(BasicStats stats,
                            float tfn,
                            float lambda)
        Computes the score.

      • explain

        public Explanation explain​(BasicStats stats,
                           float tfn,
                           float lambda)
        Explains the score. Returns the name of the model only, since both tfn and lambda are explained elsewhere.

      • toString

        public abstract java.lang.String toString()
        Subclasses must override this method to return the name of the distribution.
        Overrides:
        toString in class java.lang.Object