code: def test_check_graph_optional_input(self) -> None:
      # GivenTensorFill's input is marked optional, hence it is used in this test.
      node = helper.make_node(
          "GivenTensorFill", [""], ["Y"], name="test"
      )
      graph = helper.make_graph(
          [node],
          "test",
          [],
          [
              helper.make_tensor_value_info(
                  "Y", TensorProto.FLOAT, [1, 2]
              )
          ],
      )
      checker.check_graph(graph)
  
imports: import os
  import tempfile
  import unittest
  from typing import Sequence
  import numpy
  import onnx.defs
  import onnx.parser
  from onnx import GraphProto, SparseTensorProto, TensorProto, checker, helper, numpy_helper, shape_inference
label_desc: Use image node_id 12 for calling the TestChecker obj's underlying member method code with example usage: obj.test_check_graph_optional_input() without return types