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the usual way to implement it in numpy is a.argsort().argsort()
which would translate to a.posargsort(axis).posargsort(axis)
in larray
for large 1D arrays, another technique is faster, but not sure it's worth it for now:
https://gist.github.com/naught101/14042d91a2d0f18a6ae4#file-python_rank_benchmarking-py-L17