Beyond the 99% Accuracy Lie: Building a Leak-Free XGBoost Pipeline for Imbalanced Data
Every machine learning beginner hits the same rite of passage. You download a real-world dataset such as credit card fraud, medical diagnostics, or customer churn and train your first classifier, run accuracy evaluation, and see 99.2% accuracy flash across your screen. For about five minutes, you f…
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- 2026-10-16 13:41 · DEV Community — Machine Learning
Beyond the 99% Accuracy Lie: Building a Leak-Free XGBoost Pipeline for Imbalanced Data