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fix: handle absent sys.modules entry in modeling_utils #44978

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fix: handle absent sys.modules entry in modeling_utils #44978

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fix: handle absent sys.modules entry in _can_set_attn/experts_impleme…
cjkindel Mar 24, 2026
8688f7b
Merge branch 'main' into fix-sys-modules-keyerror
cjkindel Mar 24, 2026
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8 changes: 4 additions & 4 deletions src/transformers/modeling_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1948,9 +1948,9 @@ def _can_set_attn_implementation(cls) -> bool:
"""Detect whether the class supports setting its attention implementation dynamically. It is an ugly check based on
opening the file, but avoids maintaining yet another property flag.
"""
class_module = sys.modules[cls.__module__]
class_module = sys.modules.get(cls.__module__)
# This can happen for a custom model in a jupyter notebook or repl for example - simply do not allow to set it then
if not hasattr(class_module, "__file__"):
if class_module is None or not hasattr(class_module, "__file__"):
return False
class_file = class_module.__file__
with open(class_file, "r", encoding="utf-8") as f:
Expand All @@ -1967,9 +1967,9 @@ def _can_set_experts_implementation(cls) -> bool:
"""Detect whether the class supports setting its experts implementation dynamically. It is an ugly check based on
opening the file, but avoids maintaining yet another property flag.
"""
class_module = sys.modules[cls.__module__]
class_module = sys.modules.get(cls.__module__)
# This can happen for a custom model in a jupyter notebook or repl for example - simply do not allow to set it then
if not hasattr(class_module, "__file__"):
if class_module is None or not hasattr(class_module, "__file__"):
return False
class_file = class_module.__file__
with open(class_file, "r", encoding="utf-8") as f:
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