[Metrics] added wiki_split metrics
MEMBER
Looks all good to me thanks :)
Just did some minor corrections in the docstring
2021-07-12T17:59:08Z
https://github.com/huggingface/datasets/pull/2623#issuecomment-878478882
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2021-07-12T17:59:42Z
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Fixes: #2606

This pull request adds combine metrics for the wikisplit or English sentence split task

Reviewer: @patrickvonplaten 