AssertionError: Attribute 'thing_dataset_id_to_contiguous_id' in the metadata of 'coco_2017_train' cannot be set to a different value! {1: 0} != {0: 0}

[zkungithub]

AssertionError: Attribute 'thing_dataset_id_to_contiguous_id' in the metadata of 'coco_2017_train' cannot be set to a different value! {1: 0} != {0: 0} 修改detectron2/data/datasets中builtin_meta.py文件，但是训练报错，是不是类别不匹配，configs/default.py文件中的类别数也改过来了。（训练一类数据集）