message: Catch and suppress NotFoundError possibly raised by get_checkpoint_mtimes in rare case in the recover_last_checkpoints method of saver.py.
diff: @@ -1073,7 +1073,12 @@ class Saver(object):
  """
  checkpoints_with_mtimes = []
  for checkpoint_path in checkpoint_paths:
  + try:
  mtime = checkpoint_management.get_checkpoint_mtimes([checkpoint_path])
  + except errors.NotFoundError:
  + # It's fine if some other thread/process is deleting some older
  + # checkpoint concurrently.
  + continue
  if mtime:
  checkpoints_with_mtimes.append((checkpoint_path, mtime[0]))
  self.set_last_checkpoints_with_time(checkpoints_with_mtimes)
  