code: def _get_op(api_module, full_qualified_name: List[str]):
      """Resolve the operator function/class from the api_module: ops or fn,
      by accessing the fully qualified name.
  
      Parameters
      ----------
      api_module : module
          fn or ops
      full_qualified_name : List[str]
          For example ["readers", "File"]
      """
      op = api_module
      for elem in full_qualified_name:
          op = getattr(op, elem, None)
      return op
  
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 21 for calling a global function with example usage: _get_op(api_module, full_qualified_name) and returns: op