Class: MiniSearch::Bm25

Inherits:

Object

• Object
• MiniSearch::Bm25

Defined in:

lib/mini_search/bm_25.rb

Overview

en.wikipedia.org/wiki/Okapi_BM25

Class Method Summary

• .calculate(tf:, idf:, k1: 1.2, b: 0.75, document_length:, document_length_average:) ⇒ Object

Class Method Details

.calculate(tf:, idf:, k1: 1.2, b: 0.75, document_length:, document_length_average:) ⇒ Object

# File 'lib/mini_search/bm_25.rb', line 6

def self.calculate(tf:, idf:, k1: 1.2, b: 0.75, document_length:, document_length_average:)
  idf * (
    (tf * (k1 + 1))
    \
    (tf + k1 * (1 - b + b * (document_length.to_f / document_length_average)))
  )
end