[demilich]

Well, I suppose its website have answered the similar question. From my point of view, FAISS and ANNOY are algorithm libraries which can be integrated into any application, but can't be used directly. Meanwhile, Milvus is a server can provide ANNS services independently, which already integrated many ANNS libraryies like FAISS and ANNOY. On the other hand, neighter FAISS nor ANNOY can solve all scenarios which have different vectors data size and distribution. As a server, Milvus can choose right algorithm to solve the problem.