code: def test_mnist():
      DEBUG = False
      tempdir_root = None
      if DEBUG:
          tempdir_root = os.path.join(
              curr_path,
              f"workspace",
              "test_mnist",
              datetime.datetime.now().strftime("%Y-%m-%dT%H-%M-%S"),
          )
      curr_path = os.path.dirname(
          os.path.abspath(os.path.expanduser(__file__))
      )
      build_dir = tvm.contrib.utils.tempdir(tempdir_root)
      model_url = "https://storage.googleapis.com/download.tensorflow.org/models/tflite/digit_classifier/mnist.tflite"
      model_path = download_testdata(
          model_url, "mnist.tflite", module="model"
      )
      check_network(build_dir.path, "mnist", model_path, build_dir.path)
  
imports: import os
  import shutil
  import struct
  import sys
  import numpy
  import tensorflow
  import tvm
  import tvm.relay
  from tvm.micro.contrib import stm32
  from tvm.contrib.download import download_testdata
  from tvm import testing
  import conftest
label_desc: Use image node_id 12 for calling a global function with example usage: test_mnist() without return types