Remove unused code (#4327)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

ultralytics/utils/__init__.py

@@ -26,7 +26,6 @@ from ultralytics import __version__
 # PyTorch Multi-GPU DDP Constants
 RANK = int(os.getenv('RANK', -1))
 LOCAL_RANK = int(os.getenv('LOCAL_RANK', -1))  # https://pytorch.org/docs/stable/elastic/run.html
-WORLD_SIZE = int(os.getenv('WORLD_SIZE', 1))
 
 # Other Constants
 FILE = Path(__file__).resolve()

ultralytics/utils/files.py

@@ -22,7 +22,7 @@ class WorkingDirectory(contextlib.ContextDecorator):
         """Changes the current directory to the specified directory."""
         os.chdir(self.dir)
 
-    def __exit__(self, exc_type, exc_val, exc_tb):
+    def __exit__(self, exc_type, exc_val, exc_tb):  # noqa
         """Restore the current working directory on context exit."""
         os.chdir(self.cwd)
 

ultralytics/utils/ops.py

@@ -39,7 +39,7 @@ class Profile(contextlib.ContextDecorator):
         self.start = self.time()
         return self
 
-    def __exit__(self, type, value, traceback):
+    def __exit__(self, type, value, traceback):  # noqa
         """
         Stop timing.
         """

ultralytics/utils/torch_utils.py

@@ -15,7 +15,6 @@ import torch
 import torch.distributed as dist
 import torch.nn as nn
 import torch.nn.functional as F
-import torchvision
 
 from ultralytics.utils import DEFAULT_CFG_DICT, DEFAULT_CFG_KEYS, LOGGER, RANK, __version__
 from ultralytics.utils.checks import check_version
@@ -25,10 +24,7 @@ try:
 except ImportError:
     thop = None
 
-TORCHVISION_0_10 = check_version(torchvision.__version__, '0.10.0')
 TORCH_1_9 = check_version(torch.__version__, '1.9.0')
-TORCH_1_11 = check_version(torch.__version__, '1.11.0')
-TORCH_1_12 = check_version(torch.__version__, '1.12.0')
 TORCH_2_0 = check_version(torch.__version__, '2.0.0')
 
 
@@ -457,7 +453,7 @@ def profile(input, ops, n=10, device=None):
                     y = m(x)
                     t[1] = time_sync()
                     try:
-                        _ = (sum(yi.sum() for yi in y) if isinstance(y, list) else y).sum().backward()
+                        (sum(yi.sum() for yi in y) if isinstance(y, list) else y).sum().backward()
                         t[2] = time_sync()
                     except Exception:  # no backward method
                         # print(e)  # for debug