Wu Shixiong's Large Model Academy

Apr 6, 2026 · Artificial Intelligence

Why Rerank Beats Simple Retrieval in RAG: Practical Tips & Code

This article explains the limitations of Bi‑Encoder retrieval, introduces Cross‑Encoder rerankers, shows how a cascade of recall‑rerank‑generation improves answer quality, and provides concrete code, threshold‑filtering strategies, and domain‑specific fine‑tuning techniques for industrial RAG systems.