Exercise 1 — A first graph: the router

Guided practice7 min
Time
30 min
You need
the kit, the venv, python data/make_dataset.py done, Ollama running with llama3.2 and nomic-embed-text
Deliverable
the Mermaid drawing of your graph and the four answers of Step 6

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

Goal

A technician at NorthPeak asks two kinds of questions. "How many incidents happened in Toronto?" needs the database. "When should a pump be stopped for vibration?" needs the manuals. Today you build a graph with a classifier node that reads the question and sends it to a SQL node or a RAG node. The two tools already exist from Weeks 9 and 11. You only wire them into a graph.

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

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This lesson is part of the “Week 12 — Stateful workflows with LangGraph” module

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