add METEOR metric
MEMBER
Really nice !
Thanks for adding this one.

I noticed that there are some '-' that are left in the description in the middle of some workds. It migh come from copy-pasting the pdf paper. ex: `im-provement`. Could you fix that please ?
2020-08-14T13:59:08Z
https://github.com/huggingface/datasets/pull/479#issuecomment-674088674
https://api.github.com/repos/huggingface/datasets/issues/479
MDEyOklzc3VlQ29tbWVudDY3NDA4ODY3NA==
https://api.github.com/repos/huggingface/datasets/issues/comments/674088674/reactions
2020-08-14T13:59:08Z
https://api.github.com/repos/huggingface/datasets/issues/comments/674088674
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
@lhoestq 
Linebreaks have been removed! Note that there are still a few compound words that are hyphenated intentionally. 
2020-08-14T14:05:17Z
https://github.com/huggingface/datasets/pull/479#issuecomment-674091527
https://api.github.com/repos/huggingface/datasets/issues/479
MDEyOklzc3VlQ29tbWVudDY3NDA5MTUyNw==
https://api.github.com/repos/huggingface/datasets/issues/comments/674091527/reactions
2020-08-14T14:05:17Z
https://api.github.com/repos/huggingface/datasets/issues/comments/674091527
https://avatars.githubusercontent.com/u/24683907?v=4
https://api.github.com/users/vegarab/events{/privacy}
https://api.github.com/users/vegarab/followers
https://api.github.com/users/vegarab/following{/other_user}
https://api.github.com/users/vegarab/gists{/gist_id}
https://github.com/vegarab
vegarab
MDQ6VXNlcjI0NjgzOTA3
https://api.github.com/users/vegarab/orgs
https://api.github.com/users/vegarab/received_events
https://api.github.com/users/vegarab/repos
https://api.github.com/users/vegarab/starred{/owner}{/repo}
https://api.github.com/users/vegarab/subscriptions
User
https://api.github.com/users/vegarab
public
MEMBER
I think you just need to rebase from master to fix the CI :)
2020-08-18T14:30:21Z
https://github.com/huggingface/datasets/pull/479#issuecomment-675513401
https://api.github.com/repos/huggingface/datasets/issues/479
MDEyOklzc3VlQ29tbWVudDY3NTUxMzQwMQ==
https://api.github.com/repos/huggingface/datasets/issues/comments/675513401/reactions
2020-08-18T14:30:21Z
https://api.github.com/repos/huggingface/datasets/issues/comments/675513401
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
Yes I made the mistake of simply merging master into this branch. A rebase seems to be neater :) Although all the commits ended up being added twice. I assume you just squash them into a single one on merge anyways?
2020-08-18T14:47:41Z
https://github.com/huggingface/datasets/pull/479#issuecomment-675524102
https://api.github.com/repos/huggingface/datasets/issues/479
MDEyOklzc3VlQ29tbWVudDY3NTUyNDEwMg==
https://api.github.com/repos/huggingface/datasets/issues/comments/675524102/reactions
2020-08-18T14:47:41Z
https://api.github.com/repos/huggingface/datasets/issues/comments/675524102
https://avatars.githubusercontent.com/u/24683907?v=4
https://api.github.com/users/vegarab/events{/privacy}
https://api.github.com/users/vegarab/followers
https://api.github.com/users/vegarab/following{/other_user}
https://api.github.com/users/vegarab/gists{/gist_id}
https://github.com/vegarab
vegarab
MDQ6VXNlcjI0NjgzOTA3
https://api.github.com/users/vegarab/orgs
https://api.github.com/users/vegarab/received_events
https://api.github.com/users/vegarab/repos
https://api.github.com/users/vegarab/starred{/owner}{/repo}
https://api.github.com/users/vegarab/subscriptions
User
https://api.github.com/users/vegarab
public
MEMBER
Yes indeed they'll be squashed
2020-08-18T14:53:13Z
https://github.com/huggingface/datasets/pull/479#issuecomment-675527478
https://api.github.com/repos/huggingface/datasets/issues/479
MDEyOklzc3VlQ29tbWVudDY3NTUyNzQ3OA==
https://api.github.com/repos/huggingface/datasets/issues/comments/675527478/reactions
2020-08-18T14:53:13Z
https://api.github.com/repos/huggingface/datasets/issues/comments/675527478
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
Added the METEOR metric. Can be used like this:

```python
import nlp
meteor = nlp.load_metric('metrics/meteor')
meteor.compute(["some string", "some string"], ["some string", "some similar string"])
# {'meteor': 0.6411637931034483}
meteor.add("some string", "some string")
meteor.add('some string", "some similar string")
meteor.compute()
# {'meteor': 0.6411637931034483}
```

Uses [NLTK's implementation](https://www.nltk.org/api/nltk.translate.html#module-nltk.translate.meteor_score), [(source)](https://github.com/nltk/nltk/blob/develop/nltk/translate/meteor_score.py)