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[CPU] Fix issue: No module named 'fbgemm_gpu.experimental' #3292

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Nov 6, 2025
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[CPU] Fix issue: No module named 'fbgemm_gpu.experimental' #3292

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5 changes: 4 additions & 1 deletion torchao/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1153,7 +1153,10 @@ def is_package_at_least(package_name: str, min_version: str):
def _is_fbgemm_gpu_genai_available():
# TODO: use is_package_at_least("fbgemm_gpu", "1.2.0") when
# https://github.com/pytorch/FBGEMM/issues/4198 is fixed
if importlib.util.find_spec("fbgemm_gpu") is None:
if (
importlib.util.find_spec("fbgemm_gpu") is None
or importlib.util.find_spec("fbgemm_gpu.experimental") is None
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@jerryzh168 jerryzh168 Nov 5, 2025

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oh maybe just do importlib.util.find_spec(fbgemm_gpu.experimental.gen_ai) is None?

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@shiyang-weng shiyang-weng Nov 5, 2025

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Need to check fbgemm first, otherwise the following error will occur.

  File "/home/wengshiy/ao/torchao/quantization/quantize_/workflows/int4/int4_preshuffled_tensor.py", line 25, in <module>
    if not _is_fbgemm_gpu_genai_available():
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/home/wengshiy/ao/torchao/utils.py", line 1159, in _is_fbgemm_gpu_genai_available
    importlib.util.find_spec("fbgemm_gpu.experimental") is None
    ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib.util>", line 91, in find_spec
ModuleNotFoundError: No module named 'fbgemm_gpu'

):
return False

import fbgemm_gpu.experimental.gen_ai # noqa: F401
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