[fix] Mac M3 Setup: Couldnt install OpenCV and confirm installation version

[xnanodax]

Just went through installation and trying to remember what I did to fix my set up. By now, I've closed some terminals so I am not able to trace back exactly what I did. I'm hoping these steps can help someone out there.

Issue 1

Couldnt install conda install -c conda-forge opencv===4.5.3

Error while loading conda entry point: conda-libmamba-solver (dlopen(/Users/<user>/miniconda3/lib/python3.10/site-packages/libmambapy/bindings.cpython-310-darwin.so, 0x0002): Library not loaded: @rpath/libarchive.19.dylib Referenced from: <C6FFB0DE-2F95-397A-80F7-4F74339F6DC5> /Users/<user>/miniconda3/lib/libmamba.2.0.0.dylib Reason: tried: '/Users/<user>/miniconda3/lib/libarchive.19.dylib' (no such file), '/Users/<user>/miniconda3/lib/python3.10/site-packages/libmambapy/../../../libarchive.19.dylib' (no such file), '/Users/<user>/miniconda3/lib/python3.10/site-packages/libmambapy/../../../libarchive.19.dylib' (no such file), '/Users/<user>/miniconda3/bin/../lib/libarchive.19.dylib' (no such file), '/Users/<user>/miniconda3/bin/../lib/libarchive.19.dylib' (no such file), '/usr/local/lib/libarchive.19.dylib' (no such file), '/usr/lib/libarchive.19.dylib' (no such file, not in dyld cache)) CondaValueError: You have chosen a non-default solver backend (libmamba) but it was not recognized. Choose one of: classic

Fix
$ conda install --solver=classic conda-forge::conda-libmamba-solver conda-forge::libmamba conda-forge::libmambapy conda-forge::libarchive

Issue 2

After installing OpenCV successfully, I couldnt check my OpenCV version python -c "import cv2; print(cv2.__version__)"

Received the following stack trace:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
ImportError: dlopen(/Users/cynthiama/miniconda3/envs/mlep-w1-lab/lib/python3.8/site-packages/cv2.cpython-38-darwin.so, 0x0002): Library not loaded: @rpath/liblapack.3.dylib
  Referenced from: <A2784E06-8E0A-3B5C-B262-0BCE2AAF2DCF> /Users/cynthiama/miniconda3/envs/mlep-w1-lab/lib/libopencv_core.4.5.3.dylib
  Reason: tried: '/Users/cynthiama/miniconda3/envs/mlep-w1-lab/lib/liblapack.3.dylib' (no such file), '/Users/cynthiama/miniconda3/envs/mlep-w1-lab/lib/liblapack.3.dylib' (no such file), '/Users/cynthiama/miniconda3/envs/mlep-w1-lab/lib/python3.8/site-packages/../../liblapack.3.dylib' (no such file), '/Users/cynthiama/miniconda3/envs/mlep-w1-lab/lib/python3.8/site-packages/../../liblapack.3.dylib' (no such file), '/Users/cynthiama/miniconda3/envs/mlep-w1-lab/bin/../lib/liblapack.3.dylib' (no such file), '/Users/cynthiama/miniconda3/envs/mlep-w1-lab/bin/../lib/liblapack.3.dylib' (no such file), '/usr/local/lib/liblapack.3.dylib' (no such file), '/usr/lib/liblapack.3.dylib' (no such file, not in dyld cache)

Fix conda install python=3.10
I had to downgrade python versions