code: def create_checkpoint(self, global_step):
      checkpoint_name = "model.ckpt-{}".format(global_step)
      for suffix in ("index", "meta", "data-00000-of-00001"):
          filename = "{}.{}".format(checkpoint_name, suffix)
          # Just create the file.
          with tf.gfile.Open(
              os.path.join(self.out_dir, filename), "w"
          ) as f:
              f.write("")
      tf.train.update_checkpoint_state(self.out_dir, checkpoint_name)
  
file_path: tensor2tensor/tensor2tensor/rl/restarter_test.py
imports: import os
  from tensor2tensor.rl.restarter import Restarter
  import tensorflow.compat.v1
label_desc: Use image node_id 2 for calling the RestarterTest obj's underlying member method code with example usage: obj.create_checkpoint(global_step) without return types