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# mypy: allow-untyped-defs
import functools
import importlib.util
import torch
def _check_module_exists(name: str) -> bool:
r"""Returns if a top-level module with :attr:`name` exists *without**
importing it. This is generally safer than try-catch block around a
`import X`. It avoids third party libraries breaking assumptions of some of
our tests, e.g., setting multiprocessing start method when imported
(see librosa/#747, torchvision/#544).
"""
try:
spec = importlib.util.find_spec(name)
return spec is not None
except ImportError:
return False
@functools.lru_cache
def dill_available():
return (
_check_module_exists("dill")
# dill fails to import under torchdeploy
and not torch._running_with_deploy()
)
@functools.lru_cache
def import_dill():
if not dill_available():
return None
import dill
# XXX: By default, dill writes the Pickler dispatch table to inject its
# own logic there. This globally affects the behavior of the standard library
# pickler for any user who transitively depends on this module!
# Undo this extension to avoid altering the behavior of the pickler globally.
dill.extend(use_dill=False)
return dill
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