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3 changes: 2 additions & 1 deletion python/ray/rllib/optimizers/apex_optimizer.py
Original file line number Diff line number Diff line change
Expand Up @@ -7,12 +7,12 @@
from __future__ import print_function

import os
import queue
import random
import time
import threading

import numpy as np
from six.moves import queue

import ray
from ray.rllib.optimizers.policy_optimizer import PolicyOptimizer
Expand All @@ -22,6 +22,7 @@
from ray.rllib.utils.timer import TimerStat
from ray.rllib.utils.window_stat import WindowStat


SAMPLE_QUEUE_DEPTH = 2
REPLAY_QUEUE_DEPTH = 4
LEARNER_QUEUE_MAX_SIZE = 16
Expand Down