ModuleNotFoundError: No module named 'mmcv._ext'

[annatelegina]

hi guys,
thenk you for your awesome project. I'd like to test it on my own dataset, by during running image_demo.py file, I tackled the following problem:

I installed all the libraries from requirements.txt.
How it can be solved? Is it the version problem?

[hradec]

I was able to fix this exact problem by following #22