_on_retriever_start() — langchain Function Reference

Architecture documentation for the _on_retriever_start() function in core.py from the langchain codebase.

Function python Observability Tracers

Entity Profile

Observability→ Tracers→ _on_retriever_start() — langchain Function Reference

Dependency Diagram

graph TD
  bb277705_960f_d087_c52b_45312d2910ed["_on_retriever_start()"]
  70348e44_de0f_ccb4_c06a_8453289ed93e["_TracerCore"]
  bb277705_960f_d087_c52b_45312d2910ed -->|defined in| 70348e44_de0f_ccb4_c06a_8453289ed93e
  style bb277705_960f_d087_c52b_45312d2910ed fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/langchain_core/tracers/core.py lines 680–687

    def _on_retriever_start(self, run: Run) -> Coroutine[Any, Any, None] | None:
        """Process the Retriever Run upon start.

        Args:
            run: The retriever run.
        """
        _ = run
        return None