on_chat_model_start() — langchain Function Reference

Architecture documentation for the on_chat_model_start() function in callbacks.py from the langchain codebase.

Function python LangChainCore LanguageModelBase calls 1

Entity Profile

LangChainCore→ LanguageModelBase→ on_chat_model_start() — langchain Function Reference

Dependency Diagram

graph TD
  37ac8e32_cdfe_d447_2116_49b7617ea4fc["on_chat_model_start()"]
  12ce2fab_65a6_a2ee_acbc_711c151fefdc["FakeCallbackHandlerWithChatStart"]
  37ac8e32_cdfe_d447_2116_49b7617ea4fc -->|defined in| 12ce2fab_65a6_a2ee_acbc_711c151fefdc
  2331f184_a03d_26ca_a7fa_32b48139d604["on_chat_model_start_common()"]
  37ac8e32_cdfe_d447_2116_49b7617ea4fc -->|calls| 2331f184_a03d_26ca_a7fa_32b48139d604
  style 37ac8e32_cdfe_d447_2116_49b7617ea4fc fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/partners/groq/tests/unit_tests/fake/callbacks.py lines 267–277

    def on_chat_model_start(
        self,
        serialized: dict[str, Any],
        messages: list[list[BaseMessage]],
        *,
        run_id: UUID,
        parent_run_id: UUID | None = None,
        **kwargs: Any,
    ) -> Any:
        assert all(isinstance(m, BaseMessage) for m in chain(*messages))
        self.on_chat_model_start_common()