| --- |
| language: |
| - en |
| license: cc-by-4.0 |
| task_categories: |
| - image-segmentation |
| pretty_name: COCOTree Annotation |
| --- |
| |
| # COCOTree |
|
|
| [**Paper**](https://huggingface.co/papers/2605.22068) | [**Code**](https://github.com/melonkick3090/COCOTree) |
|
|
| [](figures/introduction_annotation.pdf) |
|
|
| COCOTree is an annotation-only release for open tree decomposition over |
| COCO images. Each image has two linked views: a semantic-node tree for local |
| labels and merged masks, and an instance-node tree for image-local mask |
| instances and visual parent-child links. |
|
|
| The full original COCO images are not redistributed here. This repository |
| includes the released annotations, metadata, validation files, and a small |
| sample folder for inspection. |
|
|
| Click either figure to open the original PDF. |
|
|
| ## Annotation Views |
|
|
| Every non-root semantic node has a merged mask, bbox, label, semantic parent, |
| semantic children, and links to its instance nodes. Every instance node has |
| its own mask, bbox, label, semantic-node id, semantic parent/children, |
| instance parent, and instance children. |
|
|
| - Semantic nodes use source tree ids such as `n00014`. |
| - Instance nodes use image-local ids such as `n00014#1`. |
| - The synthetic roots are `n00000` and `n00000#1`. |
| - Masks are encoded as COCO compressed RLE. |
|
|
| ## Construction Pipeline |
|
|
| [](figures/COCOTree_recursive_pipeline.pdf) |
|
|
| The pipeline recursively proposes visible child labels, grounds them into |
| masks, filters invalid candidates, groups repeated masks into semantic nodes, |
| and materializes instance nodes with parent-child links. |
|
|
| ## Dataset Scale |
|
|
| | Item | Count | |
| | --- | ---: | |
| | Images | 21,133 | |
| | Semantic nodes | 554,550 | |
| | Instance nodes | 1,816,065 | |
| | Unique labels | 3,508 | |
| | Max semantic depth | 8 | |
| | Max instance depth | 8 | |
|
|
| ## Files |
|
|
| - `annotations/semantic_nodes.jsonl` and `annotations/semantic_edges.jsonl`: |
| semantic tree nodes and edges. |
| - `annotations/instance_nodes.jsonl` and `annotations/instance_edges.jsonl`: |
| instance tree nodes and edges. |
| - `annotations/image_dual_tree_summary.jsonl`: image-level counts and depth |
| summaries. |
| - `annotations/parent_assignment_warnings.jsonl`: parent-assignment warnings |
| from instance tree construction. |
| - `metadata/`: dataset stats, splits, label vocab, and evaluation protocol. |
| - `samples/`: small preview subset with images, annotations, overlay examples, |
| and `dual_tree_viewer.html`. |
| - `figures/`: README preview images and the original PDF figures. |
|
|
| ## Quick Validation |
|
|
| ```bash |
| python scripts/verify_cocotree.py --release-root . |
| ``` |
|
|
| Generated: `2026-05-07T03:36:54Z` |
