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