[Numpy-discussion] import overhead of numpy.testing

Charles R Harris charlesr.harris@gmail....
Sun Aug 11 15:44:00 CDT 2013


On Sun, Aug 11, 2013 at 2:24 PM, Benjamin Root <ben.root@ou.edu> wrote:

>
> On Aug 11, 2013 5:02 AM, "Ralf Gommers" <ralf.gommers@gmail.com> wrote:
> >
> >
> >
> >
> > On Sun, Aug 11, 2013 at 3:35 AM, Benjamin Root <ben.root@ou.edu> wrote:
> >>
> >> Would there be some sort of way to detect that numpy.testing wasn't
> explicitly imported and issue a deprecation warning? Say, move the code
> into numpy._testing, import in into the namespace as testing, but then have
> the testing.py file set a flag in _testing to indicate an explicit import
> has occurred?
> >>
> >> Eventually, even _testing would no longer get imported by default and
> all will be well.
> >>
> >> Of course, that might be too convoluted?
> >
> > I'm not sure how that would work (you didn't describe how to decide that
> the import was explicit), but imho the impact would be too high.
> >
> > Ralf
> >
>
> The idea would be that within numpy (and we should fix SciPy as well), we
> would always import numpy._testing as testing, and not import testing.py
> ourselves. Then, there would be a flag in _testing.py that would be set to
> emit, by default, warnings about using np.testing without an explicit
> import, and stating which version all code will have to be switched by
> perhaps 2.0?).
>
> testing.py would do a from _testing import *, but also set the flag in
> _testing to not emit warnings, because only a non-numpy (and SciPy) module
> would have imported it.
>
> It isn't foolproof. If a project has multiple dependencies that use
> np.testing, and only one of them explicitly imports np.testing, then the
> warning becomes hidden for the non-compliant parts. However, if we make
> sure that the core SciPy projects use np._testing, it would go a long way
> to get the word out.
>
> Again, I am just throwing it out there as an idea. The speedups we are
> getting right now so far are nice, so it is entirely possible that this
> kludge is just not worth the last remaining bits of extra time.
>
>
OT: Benjamin, would you take a look at PR #3534 <http://The number of nests
varies a lot here year to year. Some years the yellow jackets have nests in
every little overhang, cranny, and all over the eaves. Other years there
are very few. I usually leave them alone and watch their comings and
goings. One year I think there was a big fight or plague because dead and
dying wasps and larvae were falling onto the ground from a nest behind some
siding. Honeybees can be worse, I once saw an old house where the bees had
taken over the inside of a whole wall. The honey was just oozing through
and dripping down the wall. That said, if I get stung I clean them buggers
out. Darwinian selection in action.>. It is the continuation of your
nanmean, nanvar, and nanstd work.

Chuck
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