def METHOD_NAME(self) -> None:
    if self._pbar is not None:
        raise ValueError("ProgressBar already initialized.")
    ndone, ntasks = self._count_tasks()
    if self._last_task is not None:
        desc = f"Computing {self._last_task}"
    else:
        desc = ""
    if self._width is None:
        self._pbar = tqdm(
            total=ntasks,
            dynamic_ncols=True,
            mininterval=self._interval,
            initial=ndone,
            leave=False,
        )
    else:
        self._pbar = tqdm(
            total=ntasks,
            ncols=self._width,
            mininterval=self._interval,
            initial=ndone,
            leave=False,
        )
    self._pbar.set_description(desc)
    self._pbar.start_t = self._started
    self._pbar.refresh()