map() — langchain Function Reference

Architecture documentation for the map() function in base.py from the langchain codebase.

Function python LangChainCore Runnables called by 2

Entity Profile

LangChainCore→ Runnables→ map() — langchain Function Reference

Dependency Diagram

graph TD
  cb51eea6_993b_93b2_5bc8_da36e6fac2df["map()"]
  4a62481c_02cb_a5de_1833_50669d5351a6["Runnable"]
  cb51eea6_993b_93b2_5bc8_da36e6fac2df -->|defined in| 4a62481c_02cb_a5de_1833_50669d5351a6
  2826dfcf_5024_bd4d_0268_8f909fbbae0c["batch()"]
  2826dfcf_5024_bd4d_0268_8f909fbbae0c -->|calls| cb51eea6_993b_93b2_5bc8_da36e6fac2df
  3e736ea3_30ef_68c3_5f32_b8a49b37d501["abatch()"]
  3e736ea3_30ef_68c3_5f32_b8a49b37d501 -->|calls| cb51eea6_993b_93b2_5bc8_da36e6fac2df
  style cb51eea6_993b_93b2_5bc8_da36e6fac2df fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/langchain_core/runnables/base.py lines 1924–1945

    def map(self) -> Runnable[list[Input], list[Output]]:
        """Return a new `Runnable` that maps a list of inputs to a list of outputs.

        Calls `invoke` with each input.

        Returns:
            A new `Runnable` that maps a list of inputs to a list of outputs.

        Example:
            ```python
            from langchain_core.runnables import RunnableLambda


            def _lambda(x: int) -> int:
                return x + 1


            runnable = RunnableLambda(_lambda)
            print(runnable.map().invoke([1, 2, 3]))  # [2, 3, 4]
            ```
        """
        return RunnableEach(bound=self)