[Numpy-discussion] NumPy-Discussion OpenBLAS and dotblas

[Ralf Gommers]

On Tue, Aug 12, 2014 at 9:24 PM, Sturla Molden <sturla.molden at gmail.com>
wrote:

> Charles R Harris <charlesr.harris at gmail.com> wrote:
>
> >    - 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.
>
> We could consider to have a linalg._linalg module that just stores BLAS and
> LAPACK function pointer values as read-only integer attributes. This way we
> could move _dotblas into the core without actually having linalg in the
> core. linalg._linalg would just sit there and own BLAS and LAPACK, and no
> other part of NumPy would need build dependencies on these libraries.


Note that those dependencies are optional now.


> When _dotblas is imported it just imports linalg._linalg and reads whatever
> function pointer value it needs. It would also make it possible to remove
> BLAS and LAPACK build dependencies from SciPy, as long as we export most or
> all of BLAS and LAPACK.
>

That's not possible. The only way you can do that is move the hard
dependency on BLAS & LAPACK to numpy, which we don't want to do.

Ralf
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