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Naive RAG Fails When Documents Are Ranked Wrong

Naive RAG retrieval relies on vector similarity alone. This fails silently when documents are semantically similar but contextually irrelevant. Re-ranking adds a second filtering gate that evaluates actual relevance. This improves accuracy 16%, costs 14x latency, and creates an auditable decision trail required by the EU AI Act.

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Raúl Ferrer
Software Architect & Tech Lead. Applying software and systems engineering principles in production to build reliable, observable, and maintainable AI. Author of iOS Architecture Patterns (Apress).

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