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RAG evaluation: how to know if your retrieval is actually good

You built a RAG app, asked it five questions in the demo, and every answer sounded right. That is not evaluation, that is vibes. The moment a real user asks something slightly off the beaten path, retrieval quietly returns the wrong chunks, the model answers confidently anyway, and nobody notices u…

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  1. 2026-09-29 13:15 · DEV Community — Machine Learning
    RAG evaluation: how to know if your retrieval is actually good

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