collections -> collections.abc
Summary: `/detectron2/evaluation/testing.py:6: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3,and in 3.9 it will stop working` is showing up in the logs
@@ -3,7 +3,8 @@ import logging
import numpy as np
import pprint
import sys
-from collections import Mapping, OrderedDict
+from collections import OrderedDict
+from collections.abc import Mapping
def print_csv_format(results):
