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Docement about how knowhere works in milvus v2.0: TODO
https://github.com/milvus-io/milvus/blob/master/docs/design_docs/index_design.md
https://github.com/milvus-io/milvus/blob/master/docs/design_docs/milvus_create_index_en.md
Motivation
Google recently released a new algorithm to find Approximate Nearest Neighbors called ScaNN. They show through benchmarks that it can perform significantly better than the existing solutions like Annoy, FAISS, hnsw. The goal is to add support for ScaNN algorithm to the list of Milvus supported indexes.
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