Exercise 3 — A retrieval chain with an "I don't know" guard

Guided practice5 min
Time
25-35 min
You need
the kit, the venv, Ollama running with llama3.2 and nomic-embed-text, the Chroma store of Week 9 in data/chroma (rebuilt here if missing)
Deliverable
the five verification lines of your Step 6

The lab kit of the course: https://github.com/hrhouma2/aiopsatlas-ml-data-diagnostics-labs-en

Goal

A technician asks "Above which vibration level must a compressor be stopped?" The answer is in the manuals, and the model must find it there, not invent it. You will connect the vector store of Week 9 to a chain with the guard of Lesson 5. Then you will ask five questions, one of which the manuals cannot answer, and write the code that verifies every answer.

Preview — the rest of the lesson is for enrolled readers.

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This lesson is part of the “Week 10 — Local LLMs and LangChain” module

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