code: def main(argv):
      del argv  # not used
      path = "model_using_multiplex"
      if os.path.exists(path):
          shutil.rmtree(path, ignore_errors=True)
      model_using_multiplex.save(multiplex_2_op.multiplex, path)
      print("Saved model to", path)
  
imports: import os
  import shutil
  from absl import app
  from tensorflow.examples.custom_ops_doc.multiplex_2 import multiplex_2_op
  from tensorflow.examples.custom_ops_doc.multiplex_4 import model_using_multiplex
label_desc: Use image node_id 1 for calling a global function with example usage: main(argv) without return types