LLM Application Frameworks: LangChain & LangGraph: sections and modules
LangGraph Core: Graphs, State & Control Flow
Build a StateGraph with nodes, edges and reducers, including MessagesState.
- Lessons
- 7 lessons
- By
- Sourav Banerjee
- Prerequisites
- None
Lessons
Start modulePractise and Check
- Deliverable
- First graph: build a graph that classifies a question, routes it to one of two nodes, and returns a structured answer.
- Assessment
- Answer the five Interview questions without notes, then run the lab.
- Interview probe
- After a refactor of Larkspur's support graph, token cost per conversation doubles and the model starts repeating the customer's question back. No test fails. What do you look for?
- Common mistakes
- Returning the whole message list from nodes under an
operator.addreducer - Leaving the destination list out of a conditional edge
- Putting the database client and secrets in graph state
- Returning the whole message list from nodes under an
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