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[BugFix] Fix hidden multiprocessing import in coding_ppo tutorial #3779

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[BugFix] Fix hidden multiprocessing import in coding_ppo tutorial #3779

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7 changes: 4 additions & 3 deletions tutorials/sphinx-tutorials/coding_ppo.py
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,9 @@

"""

# sphinx_gallery_start_ignore
import warnings

######################################################################
# If you are running this in Google Colab, make sure you install the following dependencies:
#
Expand Down Expand Up @@ -105,13 +108,11 @@
# description and more about the algorithm itself.
#

# sphinx_gallery_start_ignore
import warnings
from torch import multiprocessing

warnings.filterwarnings("ignore")
# Set multiprocessing start method to fork if not already set
# This allows the tutorial to run as a script without if __name__ == "__main__"
from torch import multiprocessing

if multiprocessing.get_start_method(allow_none=True) is None:
multiprocessing.set_start_method("fork")
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