Ultralytics Code Refactor https://ultralytics.com/actions (#13152)

Refactor code for speed and clarity

utils/torch_utils.py

@@ -37,6 +37,7 @@ def smart_inference_mode(torch_1_9=check_version(torch.__version__, "1.9.0")):
     """Applies torch.inference_mode() if torch>=1.9.0, else torch.no_grad() as a decorator for functions."""
 
     def decorate(fn):
+        """Applies torch.inference_mode() if torch>=1.9.0, else torch.no_grad() to the decorated function."""
         return (torch.inference_mode if torch_1_9 else torch.no_grad)()(fn)
 
     return decorate