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For the last 40 years, BM25 has served as the standard for search engines. It is a simple yet powerful algorithm that has been used by many search engines, including Google, Bing, and Yahoo.
Though it seemed that the advent of vector search would diminish its influence, it did so only partially. The current state-of-the-art approach to retrieval nowadays tries to incorporate BM25 along with embeddings into a hybrid search system.