navis.nblast fails in notebook about navis

[schlegelp]

Hmmm... I'm afraid that will be difficult to debug on my end.

To start with, I have no clue why there would be a difference in Jupyter vs Console. Are you using the default iPython kernel for Jupiter? The bit that seems to be breaking is the ProcessPoolExecutor in concurrent.futures.

First could you check what happens if you use nbl = navis.nblast(dps[:3], dps[3:], n_cores=1) as that will not use ProcessPoolExecutor.

Depending on how that pans out, I would consider running some simple examples for ProcessPoolExecutor (from the docs or some tutorial) and see if you get it to break too (i.e. see if it is something navis-specific).

[schlegelp]

Just a thought but it could also be the fancy ipywidget progress bars. What happens if you try this:

navis.set_pbars(jupyter=False)
nbl = navis.nblast(dps[:3], dps[3:], progress=False)

[dokato]

Indeed, ProcessPoolExecutor was the problem. n_cores=1 helped. Thanks.

[schlegelp]

Let me know if you figure out what the problem with ProcessPoolExecutor is - maybe we can fix/catch it but minimally to leave a trail for others.

[schlegelp]

Just a ping @dokato - any more insights re this?