Printed output not displayed when using joblib in jupyter notebook

[zaccharieramzi]

So I am using joblib to parallelize some code and I noticed that I couldn't print things when using it inside a jupyter notebook.

I tried using doing the same example in ipython and it worked perfectly.

Here is a minimal (not) working example to write in a jupyter notebook cell

from joblib import Parallel, delayed
Parallel(n_jobs=8)(delayed(print)(i) for i in range(10))

So I am getting the output as [None, None, None, None, None, None, None, None, None, None] but nothing is printed.

Actually, checking the logs of the notebook process, I noticed that the prints happen there. I would like the prints to happen in the notebook, not the logs of the notebook process.

I have written an SO issue as well.

From what I understood discussing with @tomMoral, it may be related to the way the IO handler is passed to the child processes.

[leliel12]

+1

[ZGainsforth]

+1

[spizwhiz]

+1

[cossio]

I am hitting this issue now. Any updates?

[GF-Huang]

2 years nobody care?

[ccordoba12]

This should have been fixed in ipykernel 6. Please try again.

[CamHolman]

+1

[zaccharieramzi]

@ccordoba12 it indeed works now with ipykernel==6.16.0. Closing this.

[gioxc88]

ipykernel 6.18.0 and it doesn't work

[jmigual]

ipykernel 6.20.1 still failing

[cfd0]

ipykernel 6.28.0 still failing

[davidbrochart]

ipykernel v6.29.0 improved the situation for threads, but I think joblib uses processes? Maybe @krassowski has ideas, since he did all the work in #1186.