Code Refactor ruff check --fix --extend-select I (#13093)

* Refactor code for speed and clarity

* Auto-format by https://ultralytics.com/actions

* Update train.py

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* Update README.md

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

---------

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>
Co-authored-by: UltralyticsAssistant <web@ultralytics.com>
Co-authored-by: Ultralytics Assistant <135830346+UltralyticsAssistant@users.noreply.github.com>

utils/loggers/__init__.py

@@ -21,7 +21,10 @@ RANK = int(os.getenv("RANK", -1))
 try:
     from torch.utils.tensorboard import SummaryWriter
 except ImportError:
-    SummaryWriter = lambda *args: None  # None = SummaryWriter(str)
+
+    def SummaryWriter(*args):
+        return None  # None = SummaryWriter(str)
+
 
 try:
     import wandb