Re: [Numpy-discussion] NumPy-Discussion OpenBLAS and dotblas

Charles,

Nothing I've seen so far envisages disturbing the existing, in my opinion flawed, Matrix Class.

I trust that I have not missed anything.

Compilation is a complex press for a person unfamiliar with the C. Anything you could do to simplify that would be welcome.

Colin W.

On 12/08/2014 1:50 PM, Charles R Harris wrote:

On Tue, Aug 12, 2014 at 8:26 AM, Nathaniel Smith <njs@pobox.com mailto:njs@pobox.com> wrote:

Hi Matt,

On Mon, Aug 11, 2014 at 10:46 PM, Matti Picus
<matti.picus@gmail.com <mailto:matti.picus@gmail.com>> wrote:
> Hi Nathaniel.
> Thanks for your prompt reply. I think numpy is a wonderful
project, and you
> all do a great job moving it forward.
> If you ask what would my vision for maturing numpy, I would like
to see a
> grouping of linalg matrix-operation functionality into a python
level
> package, exactly the opposite of more tightly tying linalg into
the core of
> numpy.

As I understood it (though I admit Chuck was pretty terse, maybe he'll
correct me :-)), what he was proposing was basically just a build
system reorganization -- it's much easier to call between C functions
that are in the same Python module than C functions that are in
different modules, so we end up with lots of boilerplate gunk for the
latter. I don't think it would involve any tighter coupling than we
already have in practice.

I'm trying to think of the correct sequence of moves. Here are my current thoughts.

• Move _dotblas down into multiarray
  1. When there is cblas, add cblas implementations of decr->f->dot.
  2. Reimplement API matrixproduct2
  3. Make ndarray.dot a first class method and use it for numpy.dot.
• Implement matmul
  1. Add matrixmultiply (matmul?) to the numpy API
  2. Implement __matmul__ method.
  3. Add functions to linalg for stacked vectors.
  4. Make sure __matmul__ works with __numpy_ufunc__
• Consider using blas_lite instead of cblas, but that is now independent of the previous steps.

<snip>

Chuck

---

NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion