message: Minor improved log statements for CheckpointSaverHook.
diff: @@ -610,18 +610,20 @@ class CheckpointSaverHook(session_run_hook.SessionRunHook):
  def _save(self, session, step):
  """Saves the latest checkpoint, returns should_stop."""
  - logging.info("Saving checkpoints for %d into %s.", step, self._save_path)
  -
  + logging.info("Calling checkpoint listeners before saving checkpoint %d...",
  + step)
  for l in self._listeners:
  l.before_save(session, step)
  + logging.info("Saving checkpoints for %d into %s.", step, self._save_path)
  self._get_saver().save(session, self._save_path, global_step=step,
  write_meta_graph=self._save_graph_def)
  self._summary_writer.add_session_log(
  SessionLog(
  status=SessionLog.CHECKPOINT, checkpoint_path=self._save_path),
  step)
  -
  + logging.info("Calling checkpoint listeners after saving checkpoint %d...",
  + step)
  should_stop = False
  for l in self._listeners:
  if l.after_save(session, step):
  