code: def check_graph(self, graph: GraphProto) -> None:
      self.assertEqual(len(graph.node), 3)
      self.assertEqual(graph.node[0].op_type, "MatMul")
      self.assertEqual(graph.node[1].op_type, "Add")
      self.assertEqual(graph.node[2].op_type, "Softmax")
  
file_path: onnx/onnx/test/parser_test.py
imports: import unittest
  from parameterized import parameterized
  import onnx
  from onnx import GraphProto, OperatorSetIdProto, checker
label_desc: Use image node_id 1 for calling the TestBasicFunctions obj's underlying member method code with example usage: obj.check_graph(graph) without return types