[Numpy-discussion] Scipy dot

David Cournapeau cournape@gmail....
Thu Nov 8 07:06:53 CST 2012


On Thu, Nov 8, 2012 at 12:12 PM, Dag Sverre Seljebotn
<d.s.seljebotn@astro.uio.no> wrote:
> On 11/08/2012 01:07 PM, Gael Varoquaux wrote:
>> On Thu, Nov 08, 2012 at 11:28:21AM +0000, Nathaniel Smith wrote:
>>> I think everyone would be very happy to see numpy.dot modified to do
>>> this automatically. But adding a scipy.dot IMHO would be fixing things
>>> in the wrong place and just create extra confusion.
>>
>> I am not sure I agree: numpy is often compiled without lapack support, as
>> it is not necessary. On the other hand scipy is always compiled with
>> lapack. Thus this makes more sens in scipy.
>
> Well, numpy.dot already contains multiple fallback cases for when it is
> compiled with BLAS and not. So I'm +1 on just making this an improvement
> on numpy.dot. I don't think there's a time when you would not want to
> use this (provided the output order issue is fixed), and it doesn't make
> sense to not have old codes take advantage of the speed improvement.

Indeed, there is no reason not to make this available in NumPy.

Nicolas, can you prepare a patch for numpy ?

David


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