Jupyter error - 'The kernel appears to have died, it will restart automatically'

[volcano63]

Seems it be easier, and more logical to get the code working outside of Jupyter notebook first, and then adding it back.

I am just curious - why? I use Jupyter all the time, locally and remotely - without a glitch. There are also free Azure notebooks

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I am not sure what your problem is, but if your computer receives dynamic IP, Jupyter session may become un-available - it often happens to me when I open session in the office, and then try to access it at home. You must kill the old session and start a new one.

I usually open it in "no-browser mode" and then open the produced link in a browser (I work on Linux)

Output:
>jupyter-notebook --no-browser --ip=$( hostname -I | awk '{print $1}' )
[I 00:40:04.786 NotebookApp] Writing notebook server cookie secret to /run/user/1000/jupyter/notebook_cookie_secret
[I 00:40:05.277 NotebookApp] Serving notebooks from local directory: /home/mark
[I 00:40:05.278 NotebookApp] 0 active kernels
[I 00:40:05.278 NotebookApp] The Jupyter Notebook is running at:
[I 00:40:05.278 NotebookApp] http://10.0.0.8:8888/?token=27296b15eb9c22614ecb6d8716cffa7a4f7d41e868d2d21a
[I 00:40:05.278 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[C 00:40:05.279 NotebookApp] 
    
    Copy/paste this URL into your browser when you connect for the first time,
    to login with a token:
        http://10.0.0.8:8888/?token=27296b15eb9c22614ecb6d8716cffa7a4f7d41e868d2d21a

I click the link at the bottom - and voila! - Jupyter session is ready