Add pearsonr mc, update functionality to match the original docs
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_The documentation is not available anymore as the PR was closed or merged._
2022-04-26T18:39:45Z
https://github.com/huggingface/datasets/pull/4226#issuecomment-1110128783
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2022-05-03T17:09:24Z
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CONTRIBUTOR
thank you @lhoestq!! :hugs: 
2022-05-03T16:42:39Z
https://github.com/huggingface/datasets/pull/4226#issuecomment-1116311901
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- adds pearsonr metric card
- adds ability to return p-value
    - p-value was mentioned in the original docs as a return value, but there was no option to return it. I updated the _compute function slightly to have an option to return the p-value.