code: def _simple_model() -> onnx.ModelProto:
      model = onnx.ModelProto()
      model.ir_version = onnx.IR_VERSION
      model.producer_name = "onnx-test"
      model.graph.name = "test"
      return model
  
imports: import io
  import os
  import pathlib
  import tempfile
  import unittest
  import google.protobuf.message
  import google.protobuf.text_format
  import parameterized
  import onnx
  from onnx import serialization
label_desc: Use image node_id 1 for calling a global function with example usage: _simple_model() and returns: model