Real-world data arrives with outliers, duplicates, missing values, and evolving schemas. Mastering cleaning pipelines is the unglamorous work that makes or breaks model performance.
Winsorize Outlier Values
~15 min· Easy
IQR Outlier Detection
Remove Duplicate Rows
Detect Schema Drift
~12 min· Easy
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Optional multiple-choice questions on the ideas behind this section. Most useful after you have tried the coding problems above.