support python2

HongwenZhang · HongwenZhang · commit d0b21f5973b6 · 2018-09-30T14:28:59.000+08:00
diff --git a/lib/modeling/FPN.py b/lib/modeling/FPN.py
@@ -1,3 +1,5 @@
+from __future__ import division
+
 import collections
 import numpy as np
 
