Use itertools instead of deeply nested for loop

[patrickmineault]

ITN/scripts/train_itn_script.py

Line 192 in dd662b3

for l1 in l1s:

This would be easier to read with itertools.product. Not something to fix in this repo, but just FYI for the next time you may have a deeply nested for loop.

[nblauch]

brilliant, thanks @patrickmineault