Multiple folders on same coco instance

[StevanCakic]

Hi, I'm having an issue when I tried to attach multiple folders (annotated data) on the same coco instance. Here is my code example:

for folderName in glob.glob('./data/test/*/'):
        register_coco_instances("my_dataset_train", {}, f"{folderName}/annotations/instances_default.json", f"{folderName}/images")

Maybe it's exist some way to attach more data on already registred coco instance, or is the only way to create new coco instance every time for each folder and then to set TRAIN conf:

cfg.DATASETS.TRAIN = ("my_dataset_train", "my_dataset_train2", "my_dataset_train3", ...)