Wu Shixiong's Large Model Academy

Jul 24, 2026 · Artificial Intelligence

Why Tweaking Prompts or Top‑K Won’t Fix RAG Errors – Trace the Evidence Layer

When a RAG system returns a wrong answer, the first instinct to change the prompt, swap models, or increase Top‑K is misguided; you must locate the exact layer where the correct evidence disappears and perform minimal, layer‑specific fixes backed by a systematic evidence‑flow trace.