ImportError: cannot import name 'AutoTokenizer' from 'transformers'
transformers: 4.6.1
tokenizers: 0.10.3


I installed transformers with 
`conda install -c huggingface transformers`
but when I `from transformers import AutoTokenizer`

Traceback (most recent call last):
  File "D:/IIE/WorkSpace/Pycharm WorkSpace/HuggingfaceNER/tokenizers.py", line 1, in <module>
    from transformers import AutoTokenizer
  File "D:\Environment\Anaconda3\envs\huggingface\lib\site-packages\transformers\__init__.py", line 48, in <module>
    from .data import (
  File "D:\Environment\Anaconda3\envs\huggingface\lib\site-packages\transformers\data\__init__.py", line 6, in <module>
    from .processors import (
  File "D:\Environment\Anaconda3\envs\huggingface\lib\site-packages\transformers\data\processors\__init__.py", line 5, in <module>
    from .glue import glue_convert_examples_to_features, glue_output_modes, glue_processors, glue_tasks_num_labels
  File "D:\Environment\Anaconda3\envs\huggingface\lib\site-packages\transformers\data\processors\glue.py", line 25, in <module>
    from ...tokenization_utils import PreTrainedTokenizer
  File "D:\Environment\Anaconda3\envs\huggingface\lib\site-packages\transformers\tokenization_utils.py", line 26, in <module>
    from .tokenization_utils_base import (
  File "D:\Environment\Anaconda3\envs\huggingface\lib\site-packages\transformers\tokenization_utils_base.py", line 31, in <module>
    from tokenizers import AddedToken
  File "D:\IIE\WorkSpace\Pycharm WorkSpace\HuggingfaceNER\tokenizers.py", line 1, in <module>
    from transformers import AutoTokenizer
ImportError: cannot import name 'AutoTokenizer' from 'transformers' (D:\Environment\Anaconda3\envs\huggingface\lib\site-packages\transformers\__init__.py)

It even worked well yesterday, and I didn't upgrade anything...

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