def _push_back_pregen_epoch_todo(self, todo_filename: str, epoch: int, sample: int) -> None:
    def _pop_front_pregen_epoch_todo(self, todo_filename: str) -> Tuple[int, int, int]:
    def _request_pregen_epoch(self, epoch: int, sample: int) -> None:
    def _each_pregen_epoch_todo(self) -> Iterator[Tuple[int, int]]:
    def _pregen_epoch_loop(self) -> None:

… james/precompute