[Numpy-discussion] 1.6.0b1 half float buffer bug?

Ralf Gommers ralf.gommers@googlemail....
Thu Mar 31 12:40:39 CDT 2011

On Thu, Mar 31, 2011 at 7:06 PM, Mark Wiebe <mwwiebe@gmail.com> wrote:
> On Wed, Mar 30, 2011 at 4:42 PM, Eli Stevens (Gmail) <wickedgrey@gmail.com>
> wrote:
>> On Fri, Mar 25, 2011 at 10:00 AM, Eli Stevens (Gmail)
>> <wickedgrey@gmail.com> wrote:
>> > Can anyone please give me some suggestions on how to go about writing
>> > a unit test for this?  Or should I just submit a pull request?
>> I've gotten a bit of positive feedback to adding the 'e' type to the
>> struct module on the python-ideas list (per my understanding, not
>> before python 3.3, but I don't think that should hinder adoption in
>> other libraries), so I'd like to ask again about unit testing a change
>> like this.  Can anyone offer some advice for where to start?
> The tests for the buffer protocol are in
> numpy/core/tests/test_multiarray.py, starting at line 1847. It does some
> round-trip testing of all the types through the memoryview object.
> You'll also need to change the _dtype_from_pep3118 in
> numpy/core/_internal.py, called from the _descriptor_from_pep3118_format
> function, so that NumPy can accept the half type from a buffer as well.
>> Also, what kind of timeframe / cutoff am I looking at to get this into
>> 1.6.0 or 1.6.x?
> Since the changes to NumPy are pretty small, I think it should be ok to get
> into 1.6.0. How to handle it is up to Ralf, however, and it would probably
> be best to get it into beta 2 which I believe he would like to release over
> the weekend (please chime in to correct me).

It would definitely need to get into beta 2, and even then I'm a
little hesitant to push in such a change at the last moment. It would
need some testing with other libraries that use the numpy buffer
protocol. Also, reading back the thread, Pauli seemed to disagree with


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