code: def save_graph_to_file(graph_file_name, module_spec, class_count):
    
    sess, _, _, _, _, _ = build_eval_session(module_spec, class_count)
    graph = sess.graph
  
    output_graph_def = tf.graph_util.convert_variables_to_constants(
        sess, graph.as_graph_def(), [FLAGS.final_tensor_name])
  
    with tf.gfile.GFile(graph_file_name, 'wb') as f:
      f.write(output_graph_def.SerializeToString())
docs: Saves an graph to file, creating a valid quantized one if necessary.