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Summary: Pull Request resolved: https://github.com/facebookresearch/faiss/pull/2682 IndexShards normally sees the indexes as opaque, so there is no way to factrorize the coarse quantizer. This diff introduces IndexIVFShards that handles IVF indexes with a common quantizer so that the quantization is computed only once. Reviewed By: alexanderguzhva Differential Revision: D42781513 fbshipit-source-id: 441316eff4c1ba0468501c456af9194ea5f042d6