Cadabra2 kernel for jupyter

Question

I've install new ubuntu 18.04 on WSL, then installed latest Anaconda and miktex packages. After that I build Cadabra 2 from source according to the instructions from here: https://github.com/kpeeters/cadabra2#linux-debian-ubuntu-mint

and tried to launch cadabra into jupyter notebook, and got this errors:

[I 17:54:38.661 NotebookApp] Kernel shutdown: 6ec00478-d54c-48ba-b6cf-93439fedb36a
[I 17:54:39.005 NotebookApp] Kernel started: e81bbd12-9d55-4523-ac94-c020e015116b, name: cadabra2
/usr/bin/python3.6: No module named cadabra2_jupyter
[I 17:54:42.004 NotebookApp] KernelRestarter: restarting kernel (1/5), new random ports
/usr/bin/python3.6: No module named cadabra2_jupyter
[I 17:54:45.029 NotebookApp] KernelRestarter: restarting kernel (2/5), new random ports
/usr/bin/python3.6: No module named cadabra2_jupyter
[I 17:54:48.048 NotebookApp] KernelRestarter: restarting kernel (3/5), new random ports
/usr/bin/python3.6: No module named cadabra2_jupyter
[I 17:54:51.068 NotebookApp] KernelRestarter: restarting kernel (4/5), new random ports
/usr/bin/python3.6: No module named cadabra2_jupyter
[W 17:54:54.093 NotebookApp] KernelRestarter: restart failed
[W 17:54:54.095 NotebookApp] Kernel e81bbd12-9d55-4523-ac94-c020e015116b died, removing from map.
[W 17:55:39.324 NotebookApp] Timeout waiting for kernel_info reply from e81bbd12-9d55-4523-ac94-c020e015116b
[E 17:55:39.326 NotebookApp] Error opening stream: HTTP 404: Not Found (Kernel does not exist: e81bbd12-9d55-4523-ac94-c020e015116b)

What did I do wrong?

Answer 1

It can't find the cadabra kernel module, set your PYTHON_PATH so it picks it up.

Comments

I tried to add the following line to my .bashrc file: export PYTHON_PATH="/home/arshtm/cadabra2/jupyterkernel/cadabra2_jupyter" or export PYTHON_PATH="/home/arshtm/cadabra2/jupyterkernel"

but it didn't work.

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Something along the lines of

export PYTHONPATH=${PYTHONPATH}:/usr/lib/x86_64-linux-gnu/python3.6/site-packages

(you may need to adjust the python version in this depending on which version of Ubuntu you are running; I think 3.6 is fine for 18.04). Then restart jupyter from that same terminal.

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No, all the same. And I have no such directory at all. But Python version is right, it's 3.6

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Are you sure you did sudo make install at the end? If so, can you email me at info@cadabra.science the output of the cmake stage?

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Hi, I've encountered the same issue. I'm wondering how was this issue sloved in the end. Thank you.