baselines/CenterNet2/centernet/data/datasets/nuimages.py

from detectron2.data.datasets.register_coco import register_coco_instances
import os

categories = [
    {'id': 0, 'name': 'car'},
    {'id': 1, 'name': 'truck'},
    {'id': 2, 'name': 'trailer'},
    {'id': 3, 'name': 'bus'},
    {'id': 4, 'name': 'construction_vehicle'},
    {'id': 5, 'name': 'bicycle'},
    {'id': 6, 'name': 'motorcycle'},
    {'id': 7, 'name': 'pedestrian'},
    {'id': 8, 'name': 'traffic_cone'},
    {'id': 9, 'name': 'barrier'},
]

def _get_builtin_metadata():
    id_to_name = {x['id']: x['name'] for x in categories}
    thing_dataset_id_to_contiguous_id = {i: i for i in range(len(categories))}
    thing_classes = [id_to_name[k] for k in sorted(id_to_name)]
    return {
        "thing_dataset_id_to_contiguous_id": thing_dataset_id_to_contiguous_id,
        "thing_classes": thing_classes}

_PREDEFINED_SPLITS = {
    "nuimages_train": ("nuimages", "nuimages/annotations/nuimages_v1.0-train.json"),
    "nuimages_val": ("nuimages", "nuimages/annotations/nuimages_v1.0-val.json"),
    "nuimages_mini": ("nuimages", "nuimages/annotations/nuimages_v1.0-mini.json"),
}

for key, (image_root, json_file) in _PREDEFINED_SPLITS.items():
    register_coco_instances(
        key,
        _get_builtin_metadata(),
        os.path.join("datasets", json_file) if "://" not in json_file else json_file,
        os.path.join("datasets", image_root),
    )