Fei's Miscellaneous Talks

Sep 14, 2026 · Backend Development

Recommender System Re-ranking: List-Level Optimization Under Multiple Constraints

This article systematically dissects the re-ranking stage in recommender systems, explaining how hard constraints (filtering, quotas, safety) and soft optimizations (diversity, blending) are orchestrated in a prioritized pipeline to transform ranked candidates into a final display list that balances user experience, platform health, and operational needs.