functions: Sequence[Union[Dict[str, Any], Type[BaseModel], Callable]],
    llm: BaseLanguageModel,
    prompt: BasePromptTemplate,
    *,
    output_key: str = "function",
    output_parser: Optional[BaseLLMOutputParser] = None,
    **kwargs: Any,
) -> LLMChain:
    """Create an LLM chain that uses OpenAI functions.
    Args:
        functions: A sequence of either dictionaries, pydantic.BaseModels classes, or
            Python functions. If dictionaries are passed in, they are assumed to
            already be a valid OpenAI functions. If only a single
            function is passed in, then it will be enforced that the model use that
            function. pydantic.BaseModels and Python functions should have docstrings
            describing what the function does. For best results, pydantic.BaseModels
            should have descriptions of the parameters and Python functions should have
            Google Python style args descriptions in the docstring. Additionally,
            Python functions should only use primitive types (str, int, float, bool) or
            pydantic.BaseModels for arguments.
        llm: Language model to use, assumed to support the OpenAI function-calling API.
        prompt: BasePromptTemplate to pass to the model.
        output_key: The key to use when returning the output in LLMChain.__call__.
        output_parser: BaseLLMOutputParser to use for parsing model outputs. By default
            will be inferred from the function types. If pydantic.BaseModels are passed
            in, then the OutputParser will try to parse outputs using those. Otherwise
            model outputs will simply be parsed as JSON. If multiple functions are
            passed in and they are not pydantic.BaseModels, the chain output will