Good jobs, thank you. Two tips for you all.

[yizhangliu]

1. When you replace ".get_graph().draw_png()" with ".get_graph().draw_mermaid_png() ", you don't need to install pygraphviz.
2. You can directly use ChatOpenAI, which can replace ChatNebius.

      from langchain_openai import ChatOpenAI
      llm = ChatOpenAI(
                  model=MODEL_NAME, 
                  base_url=BASE_URL, 
                  api_key=API_KEY,
                  temperature=0.2,
                  ...
                  )