[Numpy-discussion] Deprecate matrices in 1.15 and remove in 1.17?

[Ralf Gommers]

On Fri, Dec 1, 2017 at 8:39 AM, Charles R Harris <charlesr.harris at gmail.com>
wrote:

>
>
> On Thu, Nov 30, 2017 at 11:43 AM, Ralf Gommers <ralf.gommers at gmail.com>
> wrote:
>
>>
>>
>> On Fri, Dec 1, 2017 at 7:17 AM, Matthew Rocklin <mrocklin at gmail.com>
>> wrote:
>>
>>> How would the community handle the scipy.sparse matrix subclasses?
>>> These are still in common use.
>>>
>>
>> They're not going anywhere for quite a while (until the sparse ndarrays
>> materialize at least). Hence np.matrix needs to be moved, not deleted. We
>> discussed this earlier this year: https://mail.python.org/piperm
>> ail/numpy-discussion/2017-January/076332.html
>>
>>
>>> Somewhat related: https://github.com/scipy/scipy/issues/8162
>>>
>>> On Thu, Nov 30, 2017 at 1:13 PM, <josef.pktd at gmail.com> wrote:
>>>
>>>>
>>>>
>>>> On Thu, Nov 30, 2017 at 9:23 AM, Marten van Kerkwijk <
>>>> m.h.vankerkwijk at gmail.com> wrote:
>>>>
>>>>> Hi All,
>>>>>
>>>>> I wondered if the move to python3-only starting with numpy 1.17 would
>>>>> be a good reason to act on what we all seem to agree: that the matrix
>>>>> class was a bad idea, with its overriding of multiplication and lack
>>>>> of support for stacks of matrices.
>>>>
>>>>
>> I'd suggest any release in the next couple of years is fine,but the one
>> where we drop Python 2 support is probably the worst choice. That's one of
>> the few things the core Python devs got 100% right with the Python 3 move:
>> advocate that in the 2->3 transition packages would not make any API
>> changes in order to make porting the least painful.
>>
>> Ralf
>>
>
> Agree, we don't want to pile in too many changes at once. I think the big
> sticking point is the sparse matrices in SciPy, even issuing a
> DeprecationWarning could be problematic as long as there are sparse
> matrices. May I suggest that we put together an NEP for the NumPy side of
> things? Ralf, does SciPy have a mechanism for proposing such changes?
>

Not an official one, but any NEP-like proposal can be considered. I imagine
the NEP itself will have to say something about it anyway, so could as well
put it all in there.

Ralf
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