code: def _verify_function_set(self, extracted_model, function_set, func_domain):  # type: ignore
      checker.check_model(extracted_model)
      self.assertEqual(
          len(extracted_model.functions), len(function_set)
      )
      for function in function_set:
          self.assertIsNotNone(
              next(
                  (
                      f
                      for f in extracted_model.functions
                      if f.name == function and f.domain == func_domain
                  ),
                  None,
              )
          )
  
imports: import unittest
  import onnx
  from onnx import checker, utils
label_desc: Use image node_id 1 for calling the TestFunction obj's underlying member method code with example usage: obj._verify_function_set(extracted_model, function_set, func_domain) without return types