code: def preprocess_ext_io() -> tvm.transform.Pass:
      """This pass mutates the number of inputs going to / outputs coming out to/from
      external functions to one. This is achieved via concatenation
      of inputs and splitting of outputs in around the call to the external function.
  
      Returns
      -------
      ret : tvm.transform.Pass
          The registered pass to mutate the IO of the external functions and their calls.
      """
      return _ffi_api.PreprocessExternalFuncIO()
  
label_desc: Use image node_id 1 for calling a global function with example usage: preprocess_ext_io() and returns: _ffi_api