10-11-2016 Link Updates:

BM25F: http://www.minerazzi.com/tutorials/bm25f-model-tutorial.pdf

BM25: http://www.minerazzi.com/tutorials/okapi-bm25-model.pdf

We have a new tutorial on Okapi Simple BM25 with Extension to Multiple Fields.

Unlike the BM25, this model (known as Simple BM25F) incorporates the structure of documents into the scoring process.

In addition, we’ve uploaded a new, improved, and expanded version of the Okapi Best Match 25 tutorial.

Have a great IR day!