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Add world_size check before setting up DDP train (#3191)

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Bruno Arine 2023-06-15 21:05:15 -03:00 committed by GitHub
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commit 0d91d6df6e
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ultralytics/yolo/engine/trainer.py
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@ -217,7 +217,7 @@ class BaseTrainer:
callbacks_backup = callbacks.default_callbacks.copy() # backup callbacks as check_amp() resets them
self.amp = torch.tensor(check_amp(self.model), device=self.device)
callbacks.default_callbacks = callbacks_backup # restore callbacks
if RANK > -1: # DDP
if RANK > -1 and world_size > 1: # DDP
dist.broadcast(self.amp, src=0) # broadcast the tensor from rank 0 to all other ranks (returns None)
self.amp = bool(self.amp) # as boolean
self.scaler = amp.GradScaler(enabled=self.amp)