code: def test_default_export(self):
      output = dynamo_export(SampleModel(), torch.randn(1, 1, 2))
      self.assertIsInstance(output, ONNXProgram)
      self.assertIsInstance(output.model_proto, onnx.ModelProto)
  
imports: import io
  import os
  import onnx
  import torch
  from beartype import roar
  from torch.onnx import dynamo_export, ExportOptions, ONNXProgram
  from torch.onnx._internal import exporter, io_adapter
  from torch.onnx._internal.exporter import LargeProtobufONNXProgramSerializer, ONNXProgramSerializer, ProtobufONNXProgramSerializer, ResolvedExportOptions
  from torch.onnx._internal.fx import diagnostics
  from torch.testing._internal import common_utils
label_desc: Use image node_id 1 for calling the TestDynamoExportAPI obj's underlying member method code with example usage: obj.test_default_export() without return types