code: def func_set_onnx_support():
      return set(_onnx_func_info.keys())
  
imports: import pickle
  import zlib
  from collections import OrderedDict
  from os.path import abspath, join, dirname, expanduser
  import glob
  import os
  import yaml
  import certifi
  import ssl
  from nnabla.utils import nnabla_pb2
  from nnabla.logger import logger
label_desc: Use image node_id 21 for calling a global function with example usage: func_set_onnx_support() and returns: set