code: def func_set_import_onnx_opset(opset):
      opset = opset[len("opset_") :]
      target_func_list = []
      source_func_list = []
      for nnabla_func, impl_funcs in _onnx_func_info.items():
          for onnx_func in impl_funcs:
              _opset = onnx_func.split("@")[1]
              if _opset <= opset:
                  target_func_list.append(onnx_func)
      for nnabla_func, impl_funcs in _onnx_func_info.items():
          if set(impl_funcs) <= set(target_func_list):
              source_func_list.append(nnabla_func)
      return set(source_func_list)
  
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 30 for calling a global function with example usage: func_set_import_onnx_opset(opset) and returns: set