Phase 4: Advanced RAG · ~90 minutes · Python
End-to-End RAG System
Six lessons of components. One pipeline. One eval loop. One self-terminating demo. This is the system you ship.
Hiring signal: Can build end-to-end rag system end to end
What you will learn
- Compose the chunker, hybrid retriever, query rewriter, cross-encoder reranker, and answer generator into a single end-to-end pipeline.
- Implement an answer generator that cites its claims by chunk anchor, with refuse-on-low-confidence fallback.
- Run the lesson 68 eval against the assembled pipeline and prove the staged build wins on every metric over the same components in isolation.
- Build a self-terminating CLI demo that ingests a fixture corpus, runs a fixed query set, and exits zero with a summary report.
Introduction
Type: Build Languages: Python Prerequisites: Phase 11 lessons 06 (RAG), 10 (evaluation); Phase 19 Track B foundations (lessons 20-29); Phase 19 lessons 64, 65, 66, 67, 68 Time: ~90 minutes
Objective
Learning objectives
- Compose the chunker, hybrid retriever, query rewriter, cross-encoder reranker, and answer generator into a single end-to-end pipeline.
- Implement an answer generator that cites its claims by chunk anchor, with refuse-on-low-confidence fallback.
- Run the lesson 68 eval against the assembled pipeline and prove the staged build wins on every metric over the same components in isolation.
- Build a self-terminating CLI demo that ingests a fixture corpus, runs a fixed query set, and exits zero with a summary report.
Unlock the full lesson
You've read the first 2 sections. The rest of this lesson covers The Problem, The Concept, Build, Check Yourself, Check Yourself, Key Terms & Next — plus a hands-on lab, quiz, and project artifact.
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