fixed ImportError: cannot import name 'hf_bucket_url' on convert_pytorch_checkpoint_to_tf2.py
So I installed the latest version of transformers on Google Colab 

    !pip install transformers 

When trying to invoke the conversion file using 

    !python /usr/local/lib/python3.6/dist-packages/transformers/convert_pytorch_checkpoint_to_tf2.py .py --help  

Or trying to use 

    from transformers.file_utils import hf_bucket_url.                                 // works 
    from transformers.convert_pytorch_checkpoint_to_tf2 import *.                      // fails

    convert_pytorch_checkpoint_to_tf("gpt2", pytorch_file, config_file, tf_file).      


I get this error

     ImportError                               Traceback (most recent call last)

    <ipython-input-3-dadaf83ecea0> in <module>()
          1 from transformers.file_utils import hf_bucket_url
    ----> 2 from transformers.convert_pytorch_checkpoint_to_tf2 import *
          3 
          4 convert_pytorch_checkpoint_to_tf("gpt2", pytorch_file, config_file, tf_file)
    /usr/local/lib/python3.6/dist-packages/transformers/convert_pytorch_checkpoint_to_tf2.py in <module>()
         20 import os
         21 
    ---> 22 from transformers import (
         23     ALBERT_PRETRAINED_CONFIG_ARCHIVE_MAP,
         24     BERT_PRETRAINED_CONFIG_ARCHIVE_MAP,
    
    ImportError: cannot import name 'hf_bucket_url'


Turns out, there's a problem in the import of `hf_bucket_url`. Once fixed, the code ran properly. 
`from transformers.file_utils import default_cache_path, hf_bucket_url`
I want to import hf_bucket_url on Colab, but I still got the error
"ImportError: cannot import name 'hf_bucket_url' from 'transformers.file_utils' (/usr/local/lib/python3.9/dist-packages/transformers/file_utils.py)"
Am I do something wrong?