Raw features rarely speak the language of your model. One-hot encoding, target encoding, standardization, and binning transform data into representations that amplify signal and suppress noise.
One-Hot Encode Categorical Labels
~15 min· Easy
Target Encoding for High-Cardinality Features
Leakage-Free Feature Standardization
~20 min· Medium
Equal-Width Feature Binning
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Optional multiple-choice questions on the ideas behind this section. Most useful after you have tried the coding problems above.