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Fix pytest world_size environment bug (#4590)

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Laughing 2023-08-27 21:14:29 +08:00 committed by GitHub
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commit 47ab96dab6
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1 changed files with 5 additions and 3 deletions
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8
ultralytics/engine/trainer.py
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@ -168,9 +168,11 @@ class BaseTrainer:
def train(self):
"""Allow device='', device=None on Multi-GPU systems to default to device=0."""
if isinstance(self.args.device, int) or self.args.device: # i.e. device=0 or device=[0,1,2,3]
world_size = torch.cuda.device_count()
elif torch.cuda.is_available(): # i.e. device=None or device=''
if isinstance(self.args.device, str) and len(self.args.device): # i.e. device='0' or device='0,1,2,3'
world_size = len(self.args.device.split(','))
elif isinstance(self.args.device, tuple): # multi devices from cli is tuple type
world_size = len(self.args.device)
elif torch.cuda.is_available(): # i.e. device=None or device='' or device=number
world_size = 1 # default to device 0
else: # i.e. device='cpu' or 'mps'
world_size = 0