CODEWITHSUNDEEP
elasticsearch
Shamp
Shamp

Reputation: 31

What is bm25 and why elasticsearch chose this algorithm for scoring in version 5 and above

Can anybody explain it to me what is bm-25 and how it differs from tf-idf which was previously used and Why Elasticsearch in version 5.0+ changed their scoring algorithm from tf-idf to bm25.

Upvotes: 3

Views: 3919

Answers (1)

Nirmal
Nirmal

Reputation: 1336

BM-25 is ranking function which calculates score to represent a document's relevance with respect to query. In tests this approach gives better results compared to earlier TF-IDF based scoring.

Lucene switched to BM-25 as default scoring from 6.0 - which is underlying search library used by Elasticsearch and SOLR

Upvotes: 3

Related Questions