Advanced RAG: Hybrid Search, Re-ranking, and Guardrails

Baseline RAG (dense-only retrieval + generate) achieves 65-75% faithfulness on enterprise corpora. Advanced RAG closes that gap to 85-92% with three targeted interventions: hybrid BM25+dense retrieval (catches exact terminology misses), cross-encoder reranking (recovers precision lost in approximate ANN search), and output guardrails (enforces citation grounding and policy compliance before the response reaches users). Each intervention has a measurable latency cost and a quantifiable recall or

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