回传数据解析，兼容v5和v10

ultralytics/cfg/datasets/package-seg.yaml

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+# Ultralytics YOLO 🚀, AGPL-3.0 license
+# Package-seg dataset by Ultralytics
+# Documentation: https://docs.ultralytics.com/datasets/segment/package-seg/
+# Example usage: yolo train data=package-seg.yaml
+# parent
+# ├── ultralytics
+# └── datasets
+#     └── package-seg  ← downloads here (102 MB)
+
+# Train/val/test sets as 1) dir: path/to/imgs, 2) file: path/to/imgs.txt, or 3) list: [path/to/imgs1, path/to/imgs2, ..]
+path: ../datasets/package-seg # dataset root dir
+train: images/train # train images (relative to 'path') 1920 images
+val: images/val # val images (relative to 'path') 89 images
+test: test/images # test images (relative to 'path') 188 images
+
+# Classes
+names:
+  0: package
+
+# Download script/URL (optional)
+download: https://ultralytics.com/assets/package-seg.zip