code: def _identity_nodes(graph, include_iterables):
      """Return the IdentityInterface nodes in the graph
  
      The nodes are in topological sort order. The iterable nodes
      are included if and only if the include_iterables flag is set
      to True.
      """
      import networkx as nx
  
      return [
          node
          for node in nx.topological_sort(graph)
          if isinstance(node.interface, IdentityInterface)
          and (include_iterables or getattr(node, "iterables") is None)
      ]
  
imports: import os
  import sys
  import pickle
  from collections import defaultdict
  import re
  from copy import deepcopy
  from glob import glob
  from pathlib import Path
  from traceback import format_exception
  from hashlib import sha1
  from functools import reduce
  import numpy
  from ...None import logging, config
  from ...utils.filemanip import indirectory, relpath, fname_presuffix, ensure_list, get_related_files, save_json, savepkl, loadpkl, write_rst_header, write_rst_dict, write_rst_list
  from ...utils.misc import str2bool
  from ...utils.functions import create_function_from_source
  from ...interfaces.base.traits_extension import rebase_path_traits, resolve_path_traits, OutputMultiPath, isdefined, Undefined
  from ...interfaces.base.support import Bunch, InterfaceResult
  from ...interfaces.base import CommandLine
  from ...interfaces.utility import IdentityInterface
  from ...utils.provenance import ProvStore, pm, nipype_ns, get_id
  from inspect import signature
label_desc: Use image node_id 26 for calling a global function with example usage: _identity_nodes(graph, include_iterables) and returns: unknown