

TITLE
Why does datasets get imported when running "from transformers.models.roberta.tokenization_roberta_fast import RobertaTokenizerFast"

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When running 

    from transformers.models.roberta.tokenization_roberta_fast import RobertaTokenizerFast

I get this warning:

    ImportWarning: To use `datasets`, the module `pyarrow>=0.16.0` is required, and the current version of `pyarrow` doesn't match this condition.  If you are running this in a Google Colab, you should probably just restart the runtime to use the right version of `pyarrow`.

Why is datasets getting imported, when we import the tokenizer? 

Thanks! :)