code: def longest_fn_string():
      longest_str = ""
      for op in sorted(all_ops, key=name_sort):
          fn_string = ""
          op_full_name, submodule, op_name = ops._process_op_name(op)
          for module_name, module in ops_modules.items():
              m = module
              for part in submodule:
                  m = getattr(m, part, None)
                  if m is None:
                      break
              if m is not None and hasattr(m, op_name):
                  fn_string = link_formatter.format(
                      op=to_fn_name(op_full_name),
                      module=to_fn_module(module_name),
                  )
                  if len(fn_string) > len(longest_str):
                      longest_str = fn_string
      return longest_str
  
file_path: DALI/docs/operations_table.py
imports: from nvidia.dali import backend
  import nvidia.dali.ops
  import nvidia.dali.fn
  import nvidia.dali.plugin.pytorch
  import nvidia.dali.plugin.numba.experimental
  import sys
label_desc: Use image node_id 4 for calling a global function with example usage: longest_fn_string() and returns: longest_str