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[Bugfix] Fix 'ModuleNotFoundError: No module named 'intel_extension_for_pytorch'' for --tensor-parallel-size more than 1 #12546

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Feb 5, 2025
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[Bugfix] Fix 'ModuleNotFoundError: No module named 'intel_extension_for_pytorch'' for --tensor-parallel-size more than 1 #12546

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14 changes: 11 additions & 3 deletions vllm/distributed/parallel_state.py
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Original file line number Diff line number Diff line change
Expand Up @@ -327,9 +327,17 @@ def all_reduce(self, input_: torch.Tensor) -> torch.Tensor:
return input_

if input_.is_cpu:
import intel_extension_for_pytorch as ipex
ipex.distributed.all_reduce(input_, group=self.device_group)
return input_
try:
import intel_extension_for_pytorch as ipex
ipex.distributed.all_reduce(input_, group=self.device_group)
return input_
except ImportError:
"""
Intel IPEX not found. Falling back to PyTorch native
all_reduce for CPU
"""
torch.distributed.all_reduce(input_, group=self.device_group)
return input_

if self.tpu_communicator is not None and \
not self.tpu_communicator.disabled:
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