Class PassageScorer

Ranks passages found by PostingsHighlighter.

Each passage is scored as a miniature document within the document. The final score is computed as norm * ? (weight * tf). The default implementation is norm * BM25.

@lucene.experimental

Inheritance
System.Object
PassageScorer
Assembly: Lucene.Net.ICU.dll
Syntax
public class PassageScorer : object

Constructors

Name Description
PassageScorer()

Creates PassageScorer with these default values:

  • k1 = 1.2
  • b = 0.75
  • pivot = 87
PassageScorer(Single, Single, Single)

Creates PassageScorer with specified scoring parameters

Methods

Name Description
Norm(Int32)

Normalize a passage according to its position in the document.

Typically passages towards the beginning of the document are more useful for summarizing the contents.

The default implementation is 1 + 1/log(pivot + passageStart)
Tf(Int32, Int32)

Computes term weight, given the frequency within the passage and the passage's length.
Weight(Int32, Int32)

Computes term importance, given its in-document statistics.

Extension Methods