Datasets:
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language:
- en
license: cc-by-4.0
task_categories:
- image-segmentation
pretty_name: COCOTree Annotation
---
# COCOTree
[**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` |