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>

segment/train.py

@@ -214,7 +214,10 @@ def train(hyp, opt, device, callbacks):
     if opt.cos_lr:
         lf = one_cycle(1, hyp["lrf"], epochs)  # cosine 1->hyp['lrf']
     else:
-        lf = lambda x: (1 - x / epochs) * (1.0 - hyp["lrf"]) + hyp["lrf"]  # linear
+
+        def lf(x):
+            return (1 - x / epochs) * (1.0 - hyp["lrf"]) + hyp["lrf"]  # linear
+
     scheduler = lr_scheduler.LambdaLR(optimizer, lr_lambda=lf)  # plot_lr_scheduler(optimizer, scheduler, epochs)
 
     # EMA