minor fix

mmdet/datasets/transforms.py

@@ -95,7 +95,7 @@ class MaskTransform(object):
             for mask in masks
         ]
         if flip:
-            masks = [mmcv.imflip(mask) for mask in masks]
+            masks = [mask[:, ::-1] for mask in masks]
         padded_masks = [
             mmcv.impad(mask, pad_shape[:2], pad_val=0) for mask in masks
         ]

tools/train.py

@@ -8,12 +8,12 @@ from collections import OrderedDict
 import numpy as np
 import torch
 from mmcv import Config
-from mmcv.runner import Runner, obj_from_dict
+from mmcv.runner import Runner, obj_from_dict, DistSamplerSeedHook
 
 from mmdet import datasets, __version__
-from mmdet.core import (init_dist, DistOptimizerHook, DistSamplerSeedHook,
-                        MMDataParallel, MMDistributedDataParallel,
-                        CocoDistEvalRecallHook, CocoDistEvalmAPHook)
+from mmdet.core import (init_dist, DistOptimizerHook, MMDataParallel,
+                        MMDistributedDataParallel, CocoDistEvalRecallHook,
+                        CocoDistEvalmAPHook)
 from mmdet.datasets import build_dataloader
 from mmdet.models import build_detector, RPN