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Pull Request Prelude
Thank you for your contribution :)
Please complete the below steps before filing your PR:
I have read and understood CONTRIBUTING document.
I have read and understood CODE_OF_CONDUCT document.
I have included tests for the changes in my PR. If not, I have included a rationale for why I haven't.
I understand my PR may be closed if it becomes obvious I didn't actually perform all of these steps.
Why this change is necessary and useful
According to the docs
"New in version 0.20: SimpleImputer replaces the previous sklearn.preprocessing.Imputer estimator which is now removed."
This change tries to update the way we handle missing values using scikit-learn. Also notice that we do not have NaN values in the dataset but we have some values equal to 0 so we replace this anomaly with the mean of the column.