On loading a metric from datasets, I get the following error
{'login': 'laibamehnaz', 'id': 36405283, 'node_id': 'MDQ6VXNlcjM2NDA1Mjgz', 'avatar_url': 'https://avatars.githubusercontent.com/u/36405283?v=4', 'gravatar_id': '', 'url': 'https://api.github.com/users/laibamehnaz', 'html_url': 'https://github.com/laibamehnaz', 'followers_url': 'https://api.github.com/users/laibamehnaz/followers', 'following_url': 'https://api.github.com/users/laibamehnaz/following{/other_user}', 'gists_url': 'https://api.github.com/users/laibamehnaz/gists{/gist_id}', 'starred_url': 'https://api.github.com/users/laibamehnaz/starred{/owner}{/repo}', 'subscriptions_url': 'https://api.github.com/users/laibamehnaz/subscriptions', 'organizations_url': 'https://api.github.com/users/laibamehnaz/orgs', 'repos_url': 'https://api.github.com/users/laibamehnaz/repos', 'events_url': 'https://api.github.com/users/laibamehnaz/events{/privacy}', 'received_events_url': 'https://api.github.com/users/laibamehnaz/received_events', 'type': 'User', 'site_admin': False}
[]
[]
Hi ! We support only pyarrow > 0.17.1 so that we have access to the `PyExtensionType` object.
Could you update pyarrow and try again ?
```
pip install --upgrade pyarrow
```
`from datasets import load_metric`

`metric = load_metric('bleurt')`

Traceback:
210 class _ArrayXDExtensionType(pa.PyExtensionType):
    211 
    212     ndims: int = None

AttributeError: module 'pyarrow' has no attribute 'PyExtensionType'

Any help will be appreciated. Thank you. 
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