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Description
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Issue Description
We are already imputing categorical columns in the feature validator here. However, we still use the SimpleImputer in the pipeline to impute categorical columns which are redundant because we would not have any nans in the categorical columns by this time, see here. This will also save us a hyperparameter during the search.
Expected Behavior
The redundancy has no effect on the output of the simple imputer.
Current Behavior
The redundancy has no effect on the output of the simple imputer.
Possible Solution
Remove categorical imputer from SimpleImputer.