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Fix FSDP error when DTensor mesh is empty #8

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Merged
fzyzcjy merged 1 commit into from
Oct 10, 2025
Merged

Fix FSDP error when DTensor mesh is empty #8

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4 changes: 4 additions & 0 deletions miles/backends/fsdp_utils/update_weight_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -338,6 +338,10 @@ def request_update_params(self, state_dict):
# Ensure tensor is contiguous and on the right device
param_data = param.data.contiguous()

# avoid `DTensor._op_dispatcher.dispatch` has `assert compute_mesh is not None` error
if dist.get_world_size() == 1:
param_data = param_data.full_tensor()

# Synchronous broadcast to avoid memory buildup
dist.broadcast(param_data, 0, group=self._model_update_groups, async_op=False)

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