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According to the [docs](https://scikit-learn.org/stable/modules/generated/sklearn.impute.SimpleImputer.html#sklearn.impute.SimpleImputer) "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.
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Pull Request Prelude
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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.