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core[patch]: add to RunnableLambda docstring (#24575)

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Explain behavior when function returns a runnable.
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ccurme 2024-07-23 16:46:44 -04:00 committed by GitHub
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libs/core/langchain_core/runnables/base.py
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@ -3999,11 +3999,14 @@ class RunnableLambda(Runnable[Input, Output]):
RunnableLambda can be composed as any other Runnable and provides RunnableLambda can be composed as any other Runnable and provides
seamless integration with LangChain tracing. seamless integration with LangChain tracing.
`RunnableLambda` is best suited for code that does not need to support ``RunnableLambda`` is best suited for code that does not need to support
streaming. If you need to support streaming (i.e., be able to operate streaming. If you need to support streaming (i.e., be able to operate
on chunks of inputs and yield chunks of outputs), use `RunnableGenerator` on chunks of inputs and yield chunks of outputs), use ``RunnableGenerator``
instead. instead.
Note that if a ``RunnableLambda`` returns an instance of ``Runnable``, that
instance is invoked (or streamed) during execution.
Examples: Examples:
.. code-block:: python .. code-block:: python