azure/durable_functions/models/DurableOrchestrationContext.py [286:312]:
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                              instance_id: Optional[str] = None) -> TaskBase:
        """Schedule sub-orchestration function named `name` for execution.

        Parameters
        ----------
        name: Union[str, Callable]
            The name of the orchestrator function to call.
        input_: Optional[Any]
            The JSON-serializable input to pass to the orchestrator function.
        instance_id: Optional[str]
            A unique ID to use for the sub-orchestration instance.

        Returns
        -------
        Task
            A Durable Task that completes when the called sub-orchestrator completes or fails.
        """
        if isinstance(name, Callable) and not isinstance(name, FunctionBuilder):
            error_message = "The `call_activity` API received a `Callable` without an "\
                "associated Azure Functions trigger-type. "\
                "Please ensure you're using the Python programming model V2 "\
                "and that your activity function is annotated with the `activity_trigger`"\
                "decorator. Otherwise, provide in the name of the activity as a string."
            raise ValueError(error_message)

        if isinstance(name, FunctionBuilder):
            name = self._get_function_name(name, OrchestrationTrigger)
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azure/durable_functions/models/DurableOrchestrationContext.py [321:349]:
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                                         instance_id: Optional[str] = None) -> TaskBase:
        """Schedule sub-orchestration function named `name` for execution, with retry-options.

        Parameters
        ----------
        name: Union[str, Callable]
            The name of the activity function to schedule.
        retry_options: RetryOptions
            The settings for retrying this sub-orchestrator in case of a failure.
        input_: Optional[Any]
            The JSON-serializable input to pass to the activity function. Defaults to None.
        instance_id: str
            The instance ID of the sub-orchestrator to call.

        Returns
        -------
        Task
            A Durable Task that completes when the called sub-orchestrator completes or fails.
        """
        if isinstance(name, Callable) and not isinstance(name, FunctionBuilder):
            error_message = "The `call_activity` API received a `Callable` without an "\
                "associated Azure Functions trigger-type. "\
                "Please ensure you're using the Python programming model V2 "\
                "and that your activity function is annotated with the `activity_trigger`"\
                "decorator. Otherwise, provide in the name of the activity as a string."
            raise ValueError(error_message)

        if isinstance(name, FunctionBuilder):
            name = self._get_function_name(name, OrchestrationTrigger)
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