How to install SciPy on Apple Silicon (ARM / M1)

Question

I have successfully installed python 3.9.1 with Numpy and Matplotlib on a new Mac mini with Apple Silicon. However, I cannot install SciPy : I get compilation errors when using

python3 -m pip install scipy

I also tried installing everything from brew, and import scipy works, but using it gives a seg fault. I have installed ARM versions of lapack and openblas, but this does not fix the problem.

Has anyone succeeded? (I am interested in running it natively, not through Rosetta).

Answer 1

It's possible to install on regular arm64 brew python, you need to compile it yourself.

If numpy is already installed (from wheels) you'll need to uninstall it:

pip3 uninstall -y numpy pythran

I had to compile numpy, which requires cython and pybind11:

pip3 install cython pybind11

Then numpy can be compiled:

pip3 install --no-binary :all: --no-use-pep517 numpy

Scipy needs pythran (this should happen after installing numpy):

pip3 install pythran

Then we need to compile scipy itself, it depends on fortran and BLAS/LACK:

brew install openblas gfortran

Tell scipy where it can find this library:

export OPENBLAS=/opt/homebrew/opt/openblas/lib/

Then finally compilescipy:

pip3 install --no-binary :all: --no-use-pep517 scipy

Answer 2

This one worked for me after wasting hours:

pip install --pre -i https://pypi.anaconda.org/scipy-wheels-nightly/simple scipy

Answer 3

This solution worked on my M1 machine with pyenv:

brew install openblas
OPENBLAS="$(brew --prefix openblas)" pip install numpy scipy