def tag_last_checkpoint(self, last_filename_basename: str):
        """
        Tag the last checkpoint.

        Args:
            last_filename_basename (str): the basename of the last filename.
        """
        save_file = os.path.join(self.save_dir, "last_checkpoint")
        with PathManager.open(save_file, "w") as f:
            f.write(last_filename_basename)

        Tag the last checkpoint.

        Args:
            last_filename_basename (str): the basename of the last filename.
        
fastreid/utils/checkpoint.py