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Fix handling of maxtasksperchild in ParallelExt for better compatibil… #1939

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Fix handling of maxtasksperchild in ParallelExt for better compatibil… #1939

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9 changes: 5 additions & 4 deletions qlib/utils/paral.py
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Original file line number Diff line number Diff line change
Expand Up @@ -21,13 +21,14 @@ class ParallelExt(Parallel):
def __init__(self, *args, **kwargs):
maxtasksperchild = kwargs.pop("maxtasksperchild", None)
super(ParallelExt, self).__init__(*args, **kwargs)
if isinstance(self._backend, MultiprocessingBackend):
if isinstance(self._backend, MultiprocessingBackend) and maxtasksperchild is not None:
# 2025-05-04 joblib released version 1.5.0, in which _backend_args was removed and replaced by _backend_kwargs.
# Ref: https://github.com/joblib/joblib/pull/1525/files#diff-e4dff8042ce45b443faf49605b75a58df35b8c195978d4a57f4afa695b406bdc
if joblib.__version__ < "1.5.0":
self._backend_args["maxtasksperchild"] = maxtasksperchild # pylint: disable=E1101
else:
# Check for attribute existence instead of version comparison to be more robust
if hasattr(self, '_backend_kwargs'):
self._backend_kwargs["maxtasksperchild"] = maxtasksperchild # pylint: disable=E1101
elif hasattr(self, '_backend_args'):
self._backend_args["maxtasksperchild"] = maxtasksperchild # pylint: disable=E1101


def datetime_groupby_apply(
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