Install soliket on macos M1

[mgerbino]

This is a compilation of instructions I followed to make SOLikeT work (and pass the tox tests) on the new macos M1.

System: Monterey 12.6.3, M1 chip, arm64

The main issue was to have tensorflow correctly installed (see here) and have cosmopower find it.

1. Download latest miniconda installer (e.g., here: Download Conda environment) and properly rename it (e.g., -> miniconda.sh)
2. Install miniconda and tensor flow-deps
   bash ~/miniconda.sh -b -p $HOME/miniconda
source ~/miniconda/bin/activate
conda install -c apple tensorflow-deps
3. Create your virtual env
   conda env create -n my_env -f soliket-tests.yml
conda activate my_env
4. Install tensorflow-macos and metal with correct versioning (I had them work with 2.9 and 0.5)
   pip install tensorflow-macos==2.9
pip install tensorflow-metal==0.5.0
5. Download cosmopower manually
   git clone https://github.com/alessiospuriomancini/cosmopower
cd cosmopower
6. Open requirements.txt and change the tensorflow dep as follows:
   tensorflow>2.0 -> tensorflow-macos>2.0
7. Install cosmopower manually
   pip install .
8. Go back to soliket folder and install it
   cd path/to/your/soliket
pip install -e .

The above should let you install SOLikeT.
In order to pass tests (both with pytest and within the tox env), I needed to add camb to soliket-tests.yml in the conda requirements to be installed via conda-forge (might work also via pip, not tried). Simply, add camb before the pip requirements.

[mgerbino]

Quick update: Alessio is looking into this and will likely update the PyPI to overcome the issue above.

[itrharrison]

@mgerbino can this be closed now? We should update the installation instructions in general. I think I remember the situation changed due to Alessio's action?

[mgerbino]

@itrharrison , I asked Alessio. Last time we spoke, the issue wasn't solved and we still needed to go through the procedure above to have tensowflow installed on M1