Fix W&B project name separator compatibility (#17627)

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>
Co-authored-by: UltralyticsAssistant <web@ultralytics.com>

ultralytics/utils/callbacks/wb.py

@@ -109,7 +109,12 @@ def _log_plots(plots, step):
 
 def on_pretrain_routine_start(trainer):
     """Initiate and start project if module is present."""
-    wb.run or wb.init(project=trainer.args.project or "Ultralytics", name=trainer.args.name, config=vars(trainer.args))
+    if not wb.run:
+        wb.init(
+            project=str(trainer.args.project).replace("/", "-") if trainer.args.project else "Ultralytics",
+            name=str(trainer.args.name).replace("/", "-"),
+            config=vars(trainer.args),
+        )
 
 
 def on_fit_epoch_end(trainer):