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  • Manos Parzakonis thinks this is interesting:

Don’t forget that you can treat some of the data preparation steps as hyperparameters. For example, the grid search will automatically find out whether or not to add a feature you were not sure about (e.g., using the add_bedrooms_per_room hyperparameter of your CombinedAttributesAdder transformer). It may similarly be used to automatically find the best way to handle outliers, missing features, feature selection, and more.


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Need to try this! Check out http://scikit-learn.org/stable/auto_examples/plot_compare_reduction.html