code: def _gen_fn_signature_no_input(schema, schema_name, fn_name):
      """In case of no input, we don't have overload set, as there is no MIS involved,
      we write only the default signature, without involving @overload decorator.
      """
      return f"""
  def {fn_name}{_call_signature(schema, include_inputs=True, include_kwargs=True)}:
      \"""{_docs._docstring_generator_fn(schema_name)}
      \"""
      ...
  """
  
imports: from inspect import Parameter, Signature
  import ast
  import os
  from pathlib import Path
  from contextlib import closing
  from typing import Union, Optional
  from typing import Sequence, List, Any
  from nvidia.dali import backend
  from nvidia.dali import types
  from nvidia.dali.ops import _registry, _names, _docs
  from nvidia.dali import types
  from nvidia.dali import ops, fn
label_desc: Use image node_id 14 for calling a global function with example usage: _gen_fn_signature_no_input(schema, schema_name, fn_name) and returns: str, fn_name, _call_signature, str, _docs, str