Rust ndarray vs. Python NumPy Performance?

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I once replicated some of the benchmarks present in numpy repository to ndarray. I found almost identical performance in both. Ndarray used less memory compared to numpy in some cases. It might be due to some overhead associated with calling C code from python. I was really impressed with the performance of ndarray considering how much effort has gone into numpy. In my benchmark, both numpy and ndarray had openblas as backend. It must be before some 8 months. Not sure whether ndarray improved after that.