[Numpy-discussion] NEP: Random Number Generator Policy

Robert Kern robert.kern at gmail.com
Sun Jun 3 19:36:00 EDT 2018

On Sun, Jun 3, 2018 at 4:35 PM Eric Wieser <wieser.eric+numpy at gmail.com>

> You make a bunch of good points refuting reproducible research as an
> argument for not changing the random number streams.
> However, there’s a second use-case you don’t address - unit tests. For
> better or worse, downstream, or even our own
> <https://github.com/numpy/numpy/blob/c4813a9/numpy/core/tests/test_multiarray.py#L5093-L5108>,
> unit tests use a seeded random number generator as a shorthand to produce
> some arbirary array, and then hard-code the expected output in their tests.
> Breaking stream compatibility will break these tests.
> I don’t think writing tests in this way is particularly good idea, but
> unfortunately they do still exist.
> It would be good to address this use case in the NEP, even if the
> conclusion is just “changing the stream will break tests of this form”

I do! Search for "unit test" or "StableRandom". :-)

Robert Kern
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/numpy-discussion/attachments/20180603/94af514a/attachment.html>

More information about the NumPy-Discussion mailing list