Preparing Data for Machine Learning: Impute, Encode, and Scale in scikit-learn
A clean DataFrame still isn't a model-ready one. This guide builds a leakage-safe scikit-learn Pipeline that imputes missing values, encodes categorical columns, and scales numeric features on the real Titanic passenger dataset, and shows exactly what breaks when you skip the split-first rule.
July 18, 2026 in Machine Learning, Python by Mehdi Lotfinejad10 minutes