Update README.md

README.md

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----
-license: apache-2.0
----
+---
+license: apache-2.0
+pretty_name: Libra-81K-SFT
+task_categories:
+- question-answering
+- image-to-text
+tags:
+- gui
+- vlm
+- sft
+- webdataset
+---
+
+
+
+# Libra-81K-SFT
+
+This dataset contains:
+- `data/images/`: split image archives (`*.tar.gz.part-*`)
+- `data/annotations/`: JSON annotation files
+
+
+---
+
+## Download Dataset
+
+### 1) Install Git LFS
+```bash
+git lfs install
+````
+
+### 2) Clone the dataset repo
+
+```bash
+git clone https://huggingface.co/datasets/Ray2333/Libra-81K-SFT
+cd Libra-81K-SFT
+```
+
+---
+
+## Reconstruct and extract image archives
+
+### Folder structure
+
+After cloning, you should see:
+
+* `data/images/` containing `*.tar.gz.part-*`
+* `data/annotations/` containing `*.json`
+
+### 1) Merge split parts into `.tar.gz`
+
+This will create merged archives under `data/images_archives/`.
+
+```bash
+cd data/images
+mkdir -p ../images_archives ../images_extracted
+
+for base in $(ls *.tar.gz.part-* | sed -E 's/\.part-[0-9]+$//' | sort -u); do
+  echo "[MERGE] $base.part-* -> ../images_archives/$base"
+  cat "${base}".part-* > "../images_archives/${base}"
+done
+```
+
+### 2) Extract each merged archive
+
+This will extract each archive into a separate directory under `data/images_extracted/`.
+
+```bash
+cd ../images_archives
+for tgz in *.tar.gz; do
+  name="${tgz%.tar.gz}"
+  mkdir -p "../images_extracted/${name}"
+  echo "[EXTRACT] $tgz -> ../images_extracted/${name}"
+  tar -xzf "$tgz" -C "../images_extracted/${name}"
+done
+```
+
+After extraction, images will be available under:
+
+* `data/images_extracted/<archive_name>/...`
+
+---
+
+## Load annotations in Python
+
+```python
+import json
+from pathlib import Path
+
+ann_dir = Path("data/annotations")
+all_json = {}
+
+for p in sorted(ann_dir.glob("*.json")):
+    with open(p, "r", encoding="utf-8") as f:
+        all_json[p.name] = json.load(f)
+
+print("Loaded json files:", len(all_json))
+print("Example keys:", list(all_json.keys())[:5])
+```
+
+---
+
+## Notes
+
+* Each `*.tar.gz.part-*` group must be merged **in order** before extraction.
+* If you only need one subset (e.g., `gui-odyssey`), you can merge/extract only that prefix:
+
+  ```bash
+  cd data/images
+  cat gui-odyssey.tar.gz.part-* > ../images_archives/gui-odyssey.tar.gz
+  tar -xzf ../images_archives/gui-odyssey.tar.gz -C ../images_extracted/gui-odyssey
+  ```
+
+