def __init__()

in replay_buffer.py [0:0]


    def __init__(self, replay_dir, max_size, num_workers, nstep, discount,
                 fetch_every, save_snapshot):
        self._replay_dir = replay_dir
        self._size = 0
        self._max_size = max_size
        self._num_workers = max(1, num_workers)
        self._episode_fns = []
        self._episodes = dict()
        self._nstep = nstep
        self._discount = discount
        self._fetch_every = fetch_every
        self._samples_since_last_fetch = fetch_every
        self._save_snapshot = save_snapshot