‘'VideoStreamer' object has no attribute 'maxlen'’ and 'VideoStreamer' object has no attribute 'sizer'

[domusonway]

when i run with opencv4+cuda10.1+pytorch1.7 enviroment found a lot of error:
1.In file 'demo_line.py' line 167 ‘'VideoStreamer' object has no attribute 'maxlen'’
2.In file 'demo_line.py' line 246 'VideoStreamer' object has no attribute 'sizer'

i use constant replace 'self.maxlen' and 'self.sizer[0]', appear new error ''ext.cpython-36m-x86_64-linux-gnu.so: undefined symbol: _ZN2at4cuda4blas4gemvIfEEvcllT_PKS3_lS5_lS3_PS3_l‘