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Your pipeline retrains automatically. How do you decide whether the new model replaces the old one?

Auto-retrain is easy; auto-promote is where teams ship incidents. The champion/challenger gate design, two eval sets, segment floors, guardrail metrics, and the defensible line on when a human stays in the loop.

Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

Auto-retrain is easy; auto-promote is where teams ship incidents. The champion/challenger gate design, two eval sets, segment floors, guardrail metrics, and the defensible line on when a human stays in the loop.

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UP NEXT ON YOUR JOURNEY
Next in this trackDesign an automated retraining pipeline. What should trigger retraining?Next in this trackWhat is point-in-time correctness, and how do you avoid leakage in continuous retraining?Next in this trackWhat is training-serving skew, and how do you keep online and offline features consistent?
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