[MaskRCNN] fix the use of `thread_name_prefix` in Python3.5 (fix #1039)

examples/FasterRCNN/eval.py

@@ -2,6 +2,7 @@
 # File: eval.py
 
 import itertools
+import sys
 import os
 import json
 import numpy as np
@@ -160,7 +161,8 @@ def multithread_predict_dataflow(dataflows, model_funcs):
     assert len(dataflows) == num_worker
     if num_worker == 1:
         return predict_dataflow(dataflows[0], model_funcs[0])
-    with ThreadPoolExecutor(max_workers=num_worker, thread_name_prefix='EvalWorker') as executor, \
+    kwargs = {'thread_name_prefix': 'EvalWorker'} if sys.version_info.minor >= 6 else {}
+    with ThreadPoolExecutor(max_workers=num_worker, **kwargs) as executor, \
             tqdm.tqdm(total=sum([df.size() for df in dataflows])) as pbar:
         futures = []
         for dataflow, pred in zip(dataflows, model_funcs):

examples/ImageNetModels/imagenet_utils.py

@@ -37,7 +37,7 @@ def fbresnet_augmentor(isTrain):
             # Removing lighting leads to a tiny drop in accuracy.
             imgaug.RandomOrderAug(
                 [imgaug.BrightnessScale((0.6, 1.4), clip=False),
-                 imgaug.Contrast((0.6, 1.4), clip=False),
+                 imgaug.Contrast((0.6, 1.4), rgb=False, clip=False),
                  imgaug.Saturation(0.4, rgb=False),
                  # rgb-bgr conversion for the constants copied from fb.resnet.torch
                  imgaug.Lighting(0.1,