It would be nice if we did a benchmark and compare popular libraries like annoy, faiss, nmslib, FLANN, etc.
A good reference is /erikbern/ann-benchmarks and /piskvorky/sim-shootout.
See also this topic.
didn't compare faiss?
@anxingle thanks for a link
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Latest benchmark : https://erikbern.com/2018/02/15/new-benchmarks-for-approximate-nearest-neighbors.html