use RAFT for select_k on the gpu#656
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This changes to use RAFT https://github.com/rapidsai/raft for GPU top-k code instead of faiss. The RAFT version is quite a bit faster, and also doesn't have the same performance issues with small batch sizes that faiss has (meaning we can delete a bunch of code that was trying to work around that).
Use the raft cublas handle and thrust policy so that we use the stream associated with the raft handle (rather than just the default stream)
raft::select_k doesn't always return sorted outputs - handle this in unittest
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Benchmarking this change on a dataset of github stars - containing 9M items with 96 dimensional embeddings, shows a good improvement in queries per second:
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This changes to use RAFT https://github.com/rapidsai/raft for GPU top-k code instead of faiss. The RAFT version is quite a bit faster, and also doesn't have the same performance issues with small batch sizes that faiss has (meaning we can delete a bunch of code that was trying to work around that). RAFT also doesn't have limitations on the size of K, where faiss is limited to k less than 2048.