How to distinguish which dataset the image belongs to in unikpt annotation

[xuewenyuan]

unikpt is a collection of multiple datasets, but except for coco, other images seem to have no way to distinguish which dataset they belong to from the annotations, such as the following example:
COCO can be identified by "coco_url".

print(json['images'][0])
{'license': 3, 'file_name': '000000391895.jpg', 'coco_url': 'http://images.cocodataset.org/train2017/000000391895.jpg', 'height': 360, 'width': 640, 'date_captured': '2013-11-14 11:18:45', 'flickr_url': 'http://farm9.staticflickr.com/8186/8119368305_4e622c8349_z.jpg', 'id': 391895}

others:

print(p_json['images'][120050])
{'flickr_url': 'unknown', 'coco_url': 'unknown', 'file_name': 'car_fifth2/images_jpg/2_07961.jpg', 'id': 200207961, 'license': 1, 'date_captured': 'unknown', 'width': 1920, 'height': 1080}
print(json['images'][150050])
{'coco_url': '', 'date_captured': '', 'file_name': '017071.jpg', 'flickr_url': '', 'id': 17071, 'license': 0, 'width': 752, 'height': 752}

[lzzzbbbbb]

Yes, I have also discovered this problem. Only some image names with data set names can be found, and others are difficult to find the original data sets, such as the following ones.
{"license": 1, "id": 58486, "file_name": "000000058486.jpg", "width": 1024, "height": 683, "background": 5}
{"id": 607, "file_name": "607.jpg", "height": 160, "width": 160}