Advanced RAG Patterns

The chapters in this module, in reading order.

#	Chapter
00	Advanced RAG — The Five-Year-Old Version
01	Opening failure — polished answers, weak evidence
02	Query rewriting — same intent, better handles
03	Query expansion — one question, several search doors
04	Query decomposition — turning one hard ask into smaller hops
05	HyDE — search by imagined answer shape
06	Parent-child retrieval — pin the sentence, return the section
07	Hybrid retrieval — semantic net plus exact hook
08	Cross-encoder reranking — read the question with the passage together
09	Metadata filtering and MMR — narrow first, then avoid clones
10	Corrective RAG — judge retrieval, then repair it
11	Iterative retrieval — search, read, refine, search again
12	Routing strategies — choose the path before spending the budget
13	Confidence gates — answer, retry, or admit uncertainty
14	Vectorless RAG — retrieve by reasoning over structure, not by similarity
15	Honest admission — advanced RAG still has real limits