That was a good opportunity to raise the issue of how hosted notebooks deprive scientists from their autonomy and undermine #reproducibility. "There is no cloud".
loved that. On nix, when I wanted to use jupyter, I finished by writing about 200 LOC of a system module to have a python 2.7 and a 3.7 interpreter with tensorflow 1 ( and now, et tensorflow 1 has been deleted from nixpkgs). It look really nice to be able to declare depency directly in the notebook.
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