Multi-GPU default to single device 0

utils/torch_utils.py

@@ -72,7 +72,7 @@ def select_device(device='', batch_size=None):
 
     cuda = not cpu and torch.cuda.is_available()
     if cuda:
-        devices = device.split(',') if device else range(torch.cuda.device_count())  # i.e. 0,1,6,7
+        devices = device.split(',') if device else '0'  # range(torch.cuda.device_count())  # i.e. 0,1,6,7
         n = len(devices)  # device count
         if n > 1 and batch_size:  # check batch_size is divisible by device_count
             assert batch_size % n == 0, f'batch-size {batch_size} not multiple of GPU count {n}'