Classification recipe raises a RuntimeWarning related to imports

[Horgix]

When running the Classification recipe hello-world as per the README, the first line to be printed is a RunTimeWarning about an unpredictable behavior related to imports:

/usr/lib/python3.9/runpy.py:127: RuntimeWarning: 'torchelie.recipes.classification' found in sys.modules after import of package 'torchelie.recipes', but prior to execution of 'torchelie.recipes.classification'; this may result in unpredictable behaviour
  warn(RuntimeWarning(msg))