8000 DOC: BLAS/LAPACK linking rules by 1fish2 · Pull Request #19447 · numpy/numpy · GitHub
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DOC: BLAS/LAPACK linking rules #19447

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Merged
merged 7 commits into from
Jul 13, 2021
Merged

DOC: BLAS/LAPACK linking rules #19447

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7977994
Document BLAS/LAPACK linking rules
1fish2 Jul 10, 2021
83f2b22
.gitignore virtualenv's .python-version
1fish2 Jul 10, 2021
05d6e61
fix ")" position
1fish2 Jul 10, 2021
4452927
apply suggestions to the wheel case
1fish2 Jul 12, 2021
8a67d77
code review iteration
1fish2 Jul 12, 2021
e883802
Update numpy/distutils/misc_util.py
1fish2 Jul 13, 2021
599a72f
review feedback
1fish2 Jul 13, 2021
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1 change: 1 addition & 0 deletions .gitignore
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Expand Up @@ -76,6 +76,7 @@ doc/cdoc/build
MANIFEST
.cache
pip-wheel-metadata
.python-version

# Paver generated files #
#########################
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24 changes: 24 additions & 0 deletions numpy/distutils/misc_util.py
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Expand Up @@ -2362,6 +2362,30 @@ def show():
* ``not found``: dispatched features that are not supported
in the system

NumPy BLAS/LAPACK Installation Notes
------------------------------------
Installing a numpy wheel (``pip install numpy`` or force it
via ``pip install numpy --only-binary :numpy: numpy``) includes
an OpenBLAS implementation of the BLAS and LAPACK linear algebra
APIs. In this case, ``library_dirs`` reports the original build
time configuration as compiled with gcc/gfortran; at run time
the OpenBLAS library is in
``site-packages/numpy.libs/`` (linux), or
``site-packages/numpy/.dylibs/`` (macOS), or
``site-packages/numpy/.libs/`` (windows).

Installing numpy from source
(``pip install numpy --no-binary numpy``) searches for BLAS and
LAPACK dynamic link libraries at build time as influenced by
environment variables NPY_BLAS_LIBS, NPY_CBLAS_LIBS, and
NPY_LAPACK_LIBS; or NPY_BLAS_ORDER and NPY_LAPACK_ORDER;
or the optional file ``~/.numpy-site.cfg``.
NumPy remembers those locations and expects to load the same
libraries at run-time.
In NumPy 1.21+ on macOS, 'accelerate' (Apple's Accelerate BLAS
library) is in the default build-time search order after
'openblas'.

Examples
--------
>>> import numpy as np
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