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Summary: Pull Request resolved: https://github.com/facebookresearch/faiss/pull/2132 This diff adds the class IndexFlatCodes that becomes the parent of all "flat" encodings. IndexPQ IndexFlat IndexAdditiveQuantizer IndexScalarQuantizer IndexLSH Index2Layer The other changes are: - for IndexFlat, there is no vector<float> with the data anymore. It is replaced with a `get_xb()` function. This broke quite a few external codes, that this diff also attempts to fix. - I/O functions needed to be adapted. This is done without changing the I/O format for any index. - added a small contrib function to get the data from the IndexFlat - the functionality has been made uniform, for example remove_ids and add are now in the parent class. Eventually, we may support generic storage for flat indexes, similar to `InvertedLists`, eg to memmap the data, but this will again require a big change. Reviewed By: wickedfoo Differential Revision: D32646769 fbshipit-source-id: 04a1659173fd51b130ae45d345176b72183cae40