Error during test

[danperazzo]

Hello, thanks for releasing the code! I have been having trouble initializing this code, I have performed the installation as mentioned on the README.md. But I encountered the following error:
`Traceback (most recent call last):
File "tools/test_video.py", line 4, in
import mmcv
File "/home/daniel/anaconda3/envs/MaskTrackRCNN/lib/python3.7/site-packages/mmcv/init.py", line 4, in
from .fileio import *
File "/home/daniel/anaconda3/envs/MaskTrackRCNN/lib/python3.7/site-packages/mmcv/fileio/init.py", line 4, in
from .io import dump, load, register_handler
File "/home/daniel/anaconda3/envs/MaskTrackRCNN/lib/python3.7/site-packages/mmcv/fileio/io.py", line 4, in
from ..utils import is_list_of, is_str
File "/home/daniel/anaconda3/envs/MaskTrackRCNN/lib/python3.7/site-packages/mmcv/utils/init.py", line 29, in
from .parrots_wrapper import (CUDA_HOME, BuildExtension, CppExtension,
File "/home/daniel/anaconda3/envs/MaskTrackRCNN/lib/python3.7/site-packages/mmcv/utils/parrots_wrapper.py", line 79, in
_BatchNorm, InstanceNorm, SyncBatchNorm = _get_norm()
File "/home/daniel/anaconda3/envs/MaskTrackRCNN/lib/python3.7/site-packages/mmcv/utils/parrots_wrapper.py", line 71, in get_norm
SyncBatchNorm = torch.nn.SyncBatchNorm
AttributeError: module 'torch.nn' has no attribute 'SyncBatchNorm'

Thank you for your attention!
`

[danperazzo]

Solved with this issue