code: def make_train_sub_dir(stage_id, **kwargs):
      """Returns the log directory for training stage `stage_id`."""
      return os.path.join(
          kwargs["train_root_dir"], "stage_{:05d}".format(stage_id)
      )
  
imports: import os
  import time
  from absl import logging
  from magenta.models.gansynth.lib import networks
  import numpy
  import tensorflow.compat.v1
  import tensorflow_gan
label_desc: Use image node_id 1 for calling a global function with example usage: make_train_sub_dir(stage_id) and returns: os