No module named 'mmcv._ext'

[AshishGupta1992]

I am trying to run the main.py file in my windows and facing the attached error. I have installed all the mentioned libraries.

Please let me know if someone has faced this issue and how can i resolve it.

[Atul997]

Install the 0.4.3 version of mmcv. pip install mmcv==0.4.3

[luke4u]

Hi @Atul997 , I got the same error from mmcv = 1.0.5. But if install 0.4.3, mmdet requires to have 1.0.5. So wondering which mmdet version do you need? I have mmdet ==2.3.0

[Atul997]

Try it with mmdet==1.2.0!

[luke4u]

@Atul997 , there seems no distribution for mmdet==1.2.0. See this link https://pypi.org/project/mmdet/#history

[EHadoux]

Yep, you need to clone the Github repo and compile the project. Or at lease that's what is done in the colab notebook.