ultralytics 8.0.145 Windows URL fix and Pose MPS warning (#4034)

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

ultralytics/data/utils.py

@@ -244,7 +244,7 @@ def check_det_dataset(dataset, autodownload=True):
         val = [Path(x).resolve() for x in (val if isinstance(val, list) else [val])]  # val path
         if not all(x.exists() for x in val):
             name = clean_url(dataset)  # dataset name with URL auth stripped
-            m = f"\nDataset '{name}' images not found ⚠️, missing paths %s" % [str(x) for x in val if not x.exists()]
+            m = f"\nDataset '{name}' images not found ⚠️, missing path '{[x for x in val if not x.exists()][0]}'"
             if s and autodownload:
                 LOGGER.warning(m)
             else: