on_llm_start() — langchain Function Reference

Architecture documentation for the on_llm_start() function in streaming_aiter_final_only.py from the langchain codebase.

Function python LangChainCore ApiManagement

Entity Profile

LangChainCore→ ApiManagement→ on_llm_start() — langchain Function Reference

Dependency Diagram

graph TD
  1cfad502_36e6_46e8_0855_fee8edf85427["on_llm_start()"]
  8ff14092_eef3_abb2_55fb_ca2a28f79a83["AsyncFinalIteratorCallbackHandler"]
  1cfad502_36e6_46e8_0855_fee8edf85427 -->|defined in| 8ff14092_eef3_abb2_55fb_ca2a28f79a83
  style 1cfad502_36e6_46e8_0855_fee8edf85427 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain/langchain_classic/callbacks/streaming_aiter_final_only.py lines 68–76

    async def on_llm_start(
        self,
        serialized: dict[str, Any],
        prompts: list[str],
        **kwargs: Any,
    ) -> None:
        # If two calls are made in a row, this resets the state
        self.done.clear()
        self.answer_reached = False