code: def _docstring_prefix_from_inputs(op_name):
      """
      Generate start of the docstring for `__call__` of Operator `op_name`
      assuming the docstrings were provided for all inputs separately
  
      Returns the signature of `__call__` and list of `Args` in appropriate section
      """
      schema = _b.GetSchema(op_name)
      # Signature
      ret = (
          "__call__("
          + schema.GetCallSignatureInputs()
          + ", **kwargs)\n"
      )
      # __call__ docstring
      ret += "\nOperator call to be used in graph definition.\n"
      # Args section
      ret += _get_inputs_doc(schema)
      return ret
  
file_path: DALI/dali/python/nvidia/dali/ops/_docs.py
imports: import ast
  from nvidia.dali import backend
  from nvidia.dali.types import _default_converter, _type_name_convert_to_string
  from nvidia.dali.ops import _registry, _names
label_desc: Use image node_id 7 for calling a global function with example usage: _docstring_prefix_from_inputs(op_name) and returns: ret