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Datasets:
melonkick
/
COCOTree

Tasks:
Image Segmentation
Modalities:
Image
Text
Formats:
json
Languages:
English
Size:
< 1K
Libraries:
Datasets
pandas
Polars
License:
Dataset card Data Studio Files
xet
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2
Dataset Viewer
Auto-converted to Parquet Duplicate
schema
string
semantic_tree
string
instance_tree
string
cross_links
list
cocotree_v4_evaluation_protocol
merged-mask semantic nodes keyed by source node id
one node per instance mask keyed by semantic_node_id#instance_index
[ "semantic_nodes.instance_node_ids", "instance_nodes.semantic_node_id", "instance_nodes.parent_instance_node_id", "instance_nodes.child_instance_node_ids" ]

COCOTree

COCOTree annotation overview

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

COCOTree construction pipeline

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 

python scripts/verify_cocotree.py --release-root .

Generated: 2026-05-07T03:36:54Z
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