What is champion-challenger pattern?
mediumAnswer
- Current production model = 'champion'.
- New candidate = 'challenger'.
- Both run in shadow or A/B; challenger is promoted to champion if metrics beat by significant margin over sufficient time.
- Multiple challengers can compete simultaneously (banking + credit models).
- Modern extension: multi-armed bandit auto-routes traffic to best-performing model with exploration.
- Standard pattern in credit / fraud / recsys.
Check yourself — multiple choice
- Random
- Prod = champion; candidate = challenger; both run in shadow/AB; promote challenger if beats significantly over time; multi-armed bandit routes traffic; standard in credit/fraud/recsys
- Same as A/B
- Not real
Champion-challenger: shadow/AB competition + promote on wins.
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