[hotfix] Missing import breaks Travis builds

This commit is contained in:
Wang Qing
2019-04-19 14:12:44 +08:00
committed by Eric Liang
parent 0d433b220c
commit 9d481cc2e6
@@ -6,6 +6,7 @@ from __future__ import print_function
import logging
import threading
import math
from six.moves import queue