Consider adding `ipywidgets` as a dependency.
COLLABORATOR
Hi! We use `tqdm` to display progress bars, so I suggest you open this issue in their repo.
2022-01-24T14:53:36Z
https://github.com/huggingface/datasets/issues/3621#issuecomment-1020183329
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It depends on how you use `tqdm`, no? 

Doesn't this library import via; 

```
from tqdm.notebook import tqdm
```
2022-01-24T15:14:15Z
https://github.com/huggingface/datasets/issues/3621#issuecomment-1020205637
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COLLABORATOR
Hi! Sorry for the late reply. We import `tqdm` as `from tqdm.auto import tqdm`, which should be equal to `from tqdm.notebook import tqdm` in Jupyter.
2022-02-13T15:03:41Z
https://github.com/huggingface/datasets/issues/3621#issuecomment-1038179380
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Any objection if I make a PR that checks if the widgets library is installed beforehand? 
2022-02-13T17:41:44Z
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When I install `datasets` in a fresh virtualenv with jupyterlab I always see this error. 

```
ImportError: IProgress not found. Please update jupyter and ipywidgets. See https://ipywidgets.readthedocs.io/en/stable/user_install.html
```

It's a bit of a nuisance, because I need to run shut down the jupyterlab server in order to install the required dependency. Might it be an option to just include it as a dependency here? 