Add rmse and mae metrics.
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The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_3844). All of your documentation changes will be reflected on that endpoint.
2022-03-07T17:12:25Z
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@dnaveenr This PR is in pretty good shape, so feel free to reopen it.
2022-03-07T17:24:32Z
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This PR adds RMSE - Root Mean Squared Error and MAE - Mean Absolute Error to the metrics API.
Both implementations are based on usage of sciket-learn.

Feature request here : Add support for continuous metrics (RMSE, MAE) [#3608](https://github.com/huggingface/datasets/issues/3608)

Any suggestions and changes required will be helpful.
