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Small-to-Big Retrieval Patterns (ANSWERED)

Scenario BasedRAGMedium15 min read

Medium RAG interview question on small-to-big retrieval patterns — architecture, trade-offs, eval, and production patterns.

TL;DR — Quick Answer

Retrieve small precise units (sentences, child chunks) then expand to surrounding paragraphs or parent documents for LLM context. Maximizes retrieval precision while giving the generator enough surrounding text.

The Interview Question

Explain small-to-big retrieval patterns. How would you design, implement, and evaluate this in a production RAG system? Discuss trade-offs and failure modes.

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