[Numpy-discussion] Adding a "suffle=True" kwarg to numpy.random.Generator.choice

[Stephan Hoyer]

This sounds like a welcome backwards compatible option for more
performance. I imagine there are plenty of applications (e.g., sets) where
shuffled order doesn't matter.

+1 from me.


On Tue, Jul 9, 2019 at 5:32 PM Matti Picus <matti.picus at gmail.com> wrote:

> In PR https://github.com/numpy/numpy/pull/13812, Thrasibule rewrote the
> algorithm used with a faster alternative branch for some cases. The
> faster algorithm does not necessarily shuffle the results, so for
> instance gen.choice(2000, 2000, replace=False) may simply return
> arange(2000). In the old code the result is always shuffled. We propose
> adding a new kwarg "shuffle" that defaults to True. Users looking for
> maximum performance may choose to use shuffle=False.
>
>
> Since this is a behavioral change (although only in the new Generator
> class, the new code will not be used in RandomState), we are proposing
> it to the mailing list
>
> Any thoughts?
>
>
> Matti
>
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