Retrieval Systems (RAG)·Lesson 13 of 31·15 min
Retrieval, Ranking, and Reranking
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The concept Retrieval decides which chunks the model is allowed to see. If the right passage is not in that set, the model cannot faithfully answer, no matter how good the prompt is. A production retriever is usually more than a single vector search: you may combine lexical search (keywords, identifiers, exact policy names) with embeddings, then apply metadata filters,……
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