无法导入betr模型

[Jerry-miward]

train_joint.py
tokenizer = AutoTokenizer.from_pretrained("bert-base-cased")
bert_model = AutoModel.from_pretrained('bert-base-cased')

Traceback (most recent call last):
File "train_joint.py", line 354, in
main()
File "train_joint.py", line 348, in main
training(args)
File "train_joint.py", line 90, in training
tokenizer = AutoTokenizer.from_pretrained("bert-base-cased")
File "C:\Users\ASUS\miniconda3\envs\py38\lib\site-packages\transformers\models\auto\tokenization_auto.py", line 471, in from_pretrained
tokenizer_config = get_tokenizer_config(pretrained_model_name_or_path, **kwargs)
File "C:\Users\ASUS\miniconda3\envs\py38\lib\site-packages\transformers\models\auto\tokenization_auto.py", line 332, in get_tokenizer_config
resolved_config_file = get_file_from_repo(
File "C:\Users\ASUS\miniconda3\envs\py38\lib\site-packages\transformers\utils\hub.py", line 678, in get_file_from_repo
resolved_file = cached_path(
File "C:\Users\ASUS\miniconda3\envs\py38\lib\site-packages\transformers\utils\hub.py", line 282, in cached_path
output_path = get_from_cache(
File "C:\Users\ASUS\miniconda3\envs\py38\lib\site-packages\transformers\utils\hub.py", line 545, in get_from_cache
raise ValueError(
ValueError: Connection error, and we cannot find the requested files in the cached path. Please try again or make sure your Internet connection is on.