Update README.md

README.md

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-# Grounded Visual Spatial Reasoning
+# Grounded Visual Spatial Reasoning
+
+
+## Dataset Summary
+
+This dataset extends the [Visual Spatial Reasoning (VSP)](https://arxiv.org/pdf/2205.00363) dataset with **visual grounding annotations**: each caption is annotated with **COCO-category object mentions**, their **positions** , and **bounding boxes** in the image.
+
+## Data instance
+Each sample instance has the following structure: 
+| Field                      | Type             | Description                                      |
+|---------------------------|------------------|--------------------------------------------------|
+| `image_id`                | `int`            | COCO image ID                                    |
+| `image_file`              | `string`         | COCO-style image filename                        |
+| `image_link`              | `string`         | Direct COCO image URL                            |
+| `width`                   | `int`            | Image width in pixels                            |
+| `height`                  | `int`            | Image height in pixels                           |
+| `caption`                 | `string`         | Caption with two COCO-category object mentions   |
+| `label`                   | `int`            | Optional class label (e.g., binary task flag)    |
+| `relation`                | `string`         | Spatial relation (e.g., "on", "under", etc.)     |
+| `ref_exp.labels`          | `list[string]`   | List of object labels from COCO categories       |
+| `ref_exp.label_positions` | `list[list[int]]`| Position (start, end) of each label in caption sentence|
+| `ref_exp.bboxes`          | `list[list[float]]` | Bounding boxes `[x, y, w, h]` in pixels  |
+
+
+
+## Download Images
+To download the images, follow the instructions from the [VSP official GitHub repo](https://github.com/cambridgeltl/visual-spatial-reasoning/tree/master/data).
+
+## Citation
+If you use this dataset, please cite the original **Visual Spatial Reasoning** paper:
+```bibtex
+@article{Liu2022VisualSR,
+  title={Visual Spatial Reasoning},
+  author={Fangyu Liu and Guy Edward Toh Emerson and Nigel Collier},
+  journal={Transactions of the Association for Computational Linguistics},
+  year={2023},
+}
+```