Colab Notebook breaks when downloading the squad dataset
NONE
The notebook forces version 0.1.0. If I use the latest, things work, I'll run the whole notebook and create a PR.

But in the meantime, this issue gets fixed by changing:
`!pip install nlp==0.1.0`
to
`!pip install nlp`
2020-05-29T22:59:20Z
https://github.com/huggingface/datasets/issues/222#issuecomment-636228135
https://api.github.com/repos/huggingface/datasets/issues/222
MDEyOklzc3VlQ29tbWVudDYzNjIyODEzNQ==
https://api.github.com/repos/huggingface/datasets/issues/comments/636228135/reactions
2020-05-29T22:59:20Z
https://api.github.com/repos/huggingface/datasets/issues/comments/636228135
https://avatars.githubusercontent.com/u/338917?v=4
https://api.github.com/users/carlos-aguayo/events{/privacy}
https://api.github.com/users/carlos-aguayo/followers
https://api.github.com/users/carlos-aguayo/following{/other_user}
https://api.github.com/users/carlos-aguayo/gists{/gist_id}
https://github.com/carlos-aguayo
carlos-aguayo
MDQ6VXNlcjMzODkxNw==
https://api.github.com/users/carlos-aguayo/orgs
https://api.github.com/users/carlos-aguayo/received_events
https://api.github.com/users/carlos-aguayo/repos
https://api.github.com/users/carlos-aguayo/starred{/owner}{/repo}
https://api.github.com/users/carlos-aguayo/subscriptions
User
https://api.github.com/users/carlos-aguayo
public
NONE
It still breaks very near the end

![image](https://user-images.githubusercontent.com/338917/83312264-aa96a600-a1df-11ea-987f-2f4a0474247e.png)

2020-05-29T23:07:44Z
https://github.com/huggingface/datasets/issues/222#issuecomment-636230211
https://api.github.com/repos/huggingface/datasets/issues/222
MDEyOklzc3VlQ29tbWVudDYzNjIzMDIxMQ==
https://api.github.com/repos/huggingface/datasets/issues/comments/636230211/reactions
2020-05-29T23:07:44Z
https://api.github.com/repos/huggingface/datasets/issues/comments/636230211
https://avatars.githubusercontent.com/u/338917?v=4
https://api.github.com/users/carlos-aguayo/events{/privacy}
https://api.github.com/users/carlos-aguayo/followers
https://api.github.com/users/carlos-aguayo/following{/other_user}
https://api.github.com/users/carlos-aguayo/gists{/gist_id}
https://github.com/carlos-aguayo
carlos-aguayo
MDQ6VXNlcjMzODkxNw==
https://api.github.com/users/carlos-aguayo/orgs
https://api.github.com/users/carlos-aguayo/received_events
https://api.github.com/users/carlos-aguayo/repos
https://api.github.com/users/carlos-aguayo/starred{/owner}{/repo}
https://api.github.com/users/carlos-aguayo/subscriptions
User
https://api.github.com/users/carlos-aguayo
public
MEMBER
When you install `nlp` for the first time on a Colab runtime, it updates the `pyarrow` library that was already on colab. This update shows this message on colab:
```
WARNING: The following packages were previously imported in this runtime:
  [pyarrow]
You must restart the runtime in order to use newly installed versions.
```
You just have to restart the runtime and it should be fine.
If you don't restart, then it breaks like in your first message 
2020-05-29T23:34:22Z
https://github.com/huggingface/datasets/issues/222#issuecomment-636236206
https://api.github.com/repos/huggingface/datasets/issues/222
MDEyOklzc3VlQ29tbWVudDYzNjIzNjIwNg==
https://api.github.com/repos/huggingface/datasets/issues/comments/636236206/reactions
2020-05-29T23:34:22Z
https://api.github.com/repos/huggingface/datasets/issues/comments/636236206
https://avatars.githubusercontent.com/u/42851186?v=4
https://api.github.com/users/lhoestq/events{/privacy}
https://api.github.com/users/lhoestq/followers
https://api.github.com/users/lhoestq/following{/other_user}
https://api.github.com/users/lhoestq/gists{/gist_id}
https://github.com/lhoestq
lhoestq
MDQ6VXNlcjQyODUxMTg2
https://api.github.com/users/lhoestq/orgs
https://api.github.com/users/lhoestq/received_events
https://api.github.com/users/lhoestq/repos
https://api.github.com/users/lhoestq/starred{/owner}{/repo}
https://api.github.com/users/lhoestq/subscriptions
User
https://api.github.com/users/lhoestq
public
MEMBER
Thanks for reporting the second one ! We'll update the notebook to fix this one :)
2020-05-29T23:35:23Z
https://github.com/huggingface/datasets/issues/222#issuecomment-636236434
https://api.github.com/repos/huggingface/datasets/issues/222
MDEyOklzc3VlQ29tbWVudDYzNjIzNjQzNA==
https://api.github.com/repos/huggingface/datasets/issues/comments/636236434/reactions
2020-05-29T23:35:23Z
https://api.github.com/repos/huggingface/datasets/issues/comments/636236434
https://avatars.githubusercontent.com/u/42851186?v=4
https://api.github.com/users/lhoestq/events{/privacy}
https://api.github.com/users/lhoestq/followers
https://api.github.com/users/lhoestq/following{/other_user}
https://api.github.com/users/lhoestq/gists{/gist_id}
https://github.com/lhoestq
lhoestq
MDQ6VXNlcjQyODUxMTg2
https://api.github.com/users/lhoestq/orgs
https://api.github.com/users/lhoestq/received_events
https://api.github.com/users/lhoestq/repos
https://api.github.com/users/lhoestq/starred{/owner}{/repo}
https://api.github.com/users/lhoestq/subscriptions
User
https://api.github.com/users/lhoestq
public
CONTRIBUTOR
This trick from @thomwolf seems to be the most reliable solution to fix this colab notebook issue:

```python
# install nlp
!pip install -qq nlp==0.2.0

# Make sure that we have a recent version of pyarrow in the session before we continue - otherwise reboot Colab to activate it
import pyarrow
if int(pyarrow.__version__.split('.')[1]) < 16:
    import os
    os.kill(os.getpid(), 9)
```
2020-06-03T10:49:13Z
https://github.com/huggingface/datasets/issues/222#issuecomment-638116914
https://api.github.com/repos/huggingface/datasets/issues/222
MDEyOklzc3VlQ29tbWVudDYzODExNjkxNA==
https://api.github.com/repos/huggingface/datasets/issues/comments/638116914/reactions
2020-06-03T10:49:13Z
https://api.github.com/repos/huggingface/datasets/issues/comments/638116914
https://avatars.githubusercontent.com/u/23423619?v=4
https://api.github.com/users/patrickvonplaten/events{/privacy}
https://api.github.com/users/patrickvonplaten/followers
https://api.github.com/users/patrickvonplaten/following{/other_user}
https://api.github.com/users/patrickvonplaten/gists{/gist_id}
https://github.com/patrickvonplaten
patrickvonplaten
MDQ6VXNlcjIzNDIzNjE5
https://api.github.com/users/patrickvonplaten/orgs
https://api.github.com/users/patrickvonplaten/received_events
https://api.github.com/users/patrickvonplaten/repos
https://api.github.com/users/patrickvonplaten/starred{/owner}{/repo}
https://api.github.com/users/patrickvonplaten/subscriptions
User
https://api.github.com/users/patrickvonplaten
public
NONE
The second part got fixed here: 2cbc656d6fc4b18ce57eac070baec05b31180d39

Thanks! I'm then closing this issue.
2020-06-04T00:21:05Z
https://github.com/huggingface/datasets/issues/222#issuecomment-638527380
https://api.github.com/repos/huggingface/datasets/issues/222
MDEyOklzc3VlQ29tbWVudDYzODUyNzM4MA==
https://api.github.com/repos/huggingface/datasets/issues/comments/638527380/reactions
2020-06-04T00:21:05Z
https://api.github.com/repos/huggingface/datasets/issues/comments/638527380
https://avatars.githubusercontent.com/u/338917?v=4
https://api.github.com/users/carlos-aguayo/events{/privacy}
https://api.github.com/users/carlos-aguayo/followers
https://api.github.com/users/carlos-aguayo/following{/other_user}
https://api.github.com/users/carlos-aguayo/gists{/gist_id}
https://github.com/carlos-aguayo
carlos-aguayo
MDQ6VXNlcjMzODkxNw==
https://api.github.com/users/carlos-aguayo/orgs
https://api.github.com/users/carlos-aguayo/received_events
https://api.github.com/users/carlos-aguayo/repos
https://api.github.com/users/carlos-aguayo/starred{/owner}{/repo}
https://api.github.com/users/carlos-aguayo/subscriptions
User
https://api.github.com/users/carlos-aguayo
public
When I run the notebook in Colab
https://colab.research.google.com/github/huggingface/nlp/blob/master/notebooks/Overview.ipynb
breaks when running this cell:
![image](https://user-images.githubusercontent.com/338917/83311709-ffd1b800-a1dd-11ea-8394-3a87df0d7f8b.png)
