Enable random subsampling #122
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tfeher
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Random sampling of training set for IVF methods was reverted in rapidsai/raft#2144 due to the large memory usage of the subsample method.
Since then, PR rapidsai/raft#2155 has implemented a new random sampling method with improved memory utilization. Using that we can now enable random sampling of IVF methods (rapidsai/raft#2052 and rapidsai/raft#2077).
Random subsampling has measurable overhead for IVF-Flat, therefore it is only enabled for IVF-PQ.