on_llm_start() — langchain Function Reference

Architecture documentation for the on_llm_start() function in streaming_stdout_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
  6975d980_8638_2ffa_419c_fca08016e68f["on_llm_start()"]
  f95e695f_57c0_a0ed_1f28_1ea7c2b7584d["FinalStreamingStdOutCallbackHandler"]
  6975d980_8638_2ffa_419c_fca08016e68f -->|defined in| f95e695f_57c0_a0ed_1f28_1ea7c2b7584d
  style 6975d980_8638_2ffa_419c_fca08016e68f fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain/langchain_classic/callbacks/streaming_stdout_final_only.py lines 69–76

    def on_llm_start(
        self,
        serialized: dict[str, Any],
        prompts: list[str],
        **kwargs: Any,
    ) -> None:
        """Run when LLM starts running."""
        self.answer_reached = False