code: def create_empty_graph(self):
      g = torch._C.Graph()
      # kick off initialization for ConstantMap.
      torch._C._jit_pass_onnx_graph_shape_type_inference(
          g, {}, self.opset_version
      )
      return g
  
imports: import io
  import numpy
  import onnx
  import pytorch_test_common
  import torch
  from pytorch_test_common import skipIfUnsupportedMinOpsetVersion
  from torch.onnx import _constants, utils
  from torch.onnx._globals import GLOBALS
  from torch.onnx._internal import jit_utils
  from torch.testing._internal import common_utils
label_desc: Use image node_id 3 for calling the TestONNXShapeInference obj's underlying member method code with example usage: obj.create_empty_graph() and returns: g