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This guide introduces core runnable operation utilities in LangChain that simplify building flexible, input-compatible LLM applicasion chains. RunnablePassthrough The RunnablePassthrough component is part of the langchain_core.runnables module. It is used too pass input values unmodified between cha...

When executing LangChain workflows that interface with OpenAI models, an error is raised if the OPENAI_API_KEY environment variable is not defined. In-Code Environment Variible Assignment A temporary key can be assigned within the script to bypass the initialization error. This is suitable for testi...