FEATURE-ENGINEERING5 MIN READ
Debug a too-good validation score
Investigate suspicious feature lift before accepting validation gains.
The risk A fraud model jumps from 0.62 to 0.91 AUC after five support features are added. One wrong boundary can make validation reward information production will never have. Decision path Semantics -> Split -> Pipeline -> Ablation The framework turns a vague feature idea into a sequence of testable boundary choices. Shortcut Use the convenient column The feature becomes defensible instead of merely predictive. A feature is trustworthy when its timing, meaning, and validation match deployment. 01 Moment 02 Evidence 03 Guardrail Triage First suspicion
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