on_chat_model_start() — langchain Function Reference

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

Function python LangChainCore LanguageModelBase called by 1

Entity Profile

LangChainCore→ LanguageModelBase→ on_chat_model_start() — langchain Function Reference

Dependency Diagram

graph TD
  e79e9024_3d5b_d084_f335_deaf56d8c2bb["on_chat_model_start()"]
  62e5cd38_3cf4_f6dc_d24f_67d0946e71d5["MyCustomAsyncHandler"]
  e79e9024_3d5b_d084_f335_deaf56d8c2bb -->|defined in| 62e5cd38_3cf4_f6dc_d24f_67d0946e71d5
  14e65869_1f28_9025_bab4_7fa0e4fc9440["test_callback_handlers()"]
  14e65869_1f28_9025_bab4_7fa0e4fc9440 -->|calls| e79e9024_3d5b_d084_f335_deaf56d8c2bb
  style e79e9024_3d5b_d084_f335_deaf56d8c2bb fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/tests/unit_tests/fake/test_fake_chat_model.py lines 167–180

        async def on_chat_model_start(
            self,
            serialized: dict[str, Any],
            messages: list[list[BaseMessage]],
            *,
            run_id: UUID,
            parent_run_id: UUID | None = None,
            tags: list[str] | None = None,
            metadata: dict[str, Any] | None = None,
            **kwargs: Any,
        ) -> Any:
            # Do nothing
            # Required to implement since this is an abstract method
            pass