Comment by OutOfHere

The submission and the readme fail to explain the important thing, which is how BM25 is run. If it creates bags of words for every document for every query, that would be ineffective. If it reuses the BM25 index, it is not clear when it is constricted, updated, and how it is stored.

Because BM25 ostensibly relies on word matching, there is no way it will extend to concept matching.