I'm wondering if the issue reported in #124 and #125 is fully fixed. I'm using this through joblib 145.2 (which vendors loky 2.6.0 apparently) and it throws me a ton of errors on the default loky backend.
I mean by that that limiting to 1 core, so that it uses the sequential backend, works fine, but even adding here the freeze_support line as needed doesn't work.

I'm really not sure if the fault lies here or with pyinstaller, but the same code did use to work using plain old multiprocessing though. Here's what I mean as for the error

It looks like it works fine, and then fails to dispatch more jobs. Pyinstaller itself is using a kind of workaround for multiprocessing (see here https://github.com/pyinstaller/pyinstaller/wiki/Recipe-Multiprocessing), so maybe that is interfering with however loky dispatch stuff since it rewrites a bunch of method in the process.