Class NormalizationH2

java.lang.Object
org.apache.lucene.search.similarities.Normalization
org.apache.lucene.search.similarities.NormalizationH2

public class NormalizationH2 extends Normalization
Normalization model in which the term frequency is inversely related to the length.

While this model is parameterless in the original article, the thesis introduces the parameterized variant. The default value for the c parameter is 1.

  • Constructor Details

    • NormalizationH2

      public NormalizationH2(float c)
      Creates NormalizationH2 with the supplied parameter c.
      Parameters:
      c - hyper-parameter that controls the term frequency normalization with respect to the document length.
    • NormalizationH2

      public NormalizationH2()
  • Method Details

    • tfn

      public final float tfn(BasicStats stats, float tf, float len)
      Description copied from class: Normalization
      Returns the normalized term frequency.
      Specified by:
      tfn in class Normalization
      len - the field length.
    • toString

      public String toString()
      Description copied from class: Normalization
      Subclasses must override this method to return the code of the normalization formula. Refer to the original paper for the list.
      Specified by:
      toString in class Normalization
    • getC

      public float getC()
      Returns the c parameter.
      See Also: