On 8/7/21 2:23 am, Jerry Morrison wrote:
Got it!
*Summary:*
* Installing a numpy wheel (e.g. `pip install numpy==1.21.0`) uses its
embedded OpenBLAS on every platform that has a wheel.
That OpenBLAS is always compiled with gcc/gfortran.
In this case, `np.show_config()` reports `library_dirs =
['/usr/local/lib']` even though there's no libblas in that directory.
* Installing numpy from source (e.g. `pip install numpy==1.21.0
--no-binary numpy)` looks for BLAS & LAPACK libraries at build time as
influenced by the environment vars NPY_BLAS_ORDER/NPY_LAPACK_ORDER or
by the file ~/.numpy-site.cfg.
On macOS, 'accelerate' is in the default search order after 'openblas'.
On macOS < 11.3, importing numpy that's linked to Accelerate will
detect an Accelerate bug and raise a RuntimeError.
That seems correct, although admittedly show_config could do a better
job. The problem is that not every BLAS implementation provides a
convenient method to self-report.
It might be nice to document all this somewhere more permanent, the
docstring for show_config might be a good place to start.
Matti
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