Fix import on Colab
CONTRIBUTOR
@lhoestq @albertvillanova - It might be a good idea to have a patch release after this gets merged (presumably tomorrow morning when you're around). The Colab issue linked to this PR is a pretty big blocker. 
2021-07-21T19:29:49Z
https://github.com/huggingface/datasets/pull/2697#issuecomment-884440763
https://api.github.com/repos/huggingface/datasets/issues/2697
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2021-07-21T19:29:49Z
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Fix #2695, fix #2700. 