Hi. i have same problem too.
But i solved to downgrade torch and torchvision version.
My system is windows, and gtx 750ti using cuda 10.2.
I used
conda install pytorch==1.9.0 torchvision==0.10.0 torchaudio==0.9.0 cudatoolkit=10.2 -c pytorch
I think that latest version of pytorch isn’t match CUDA 10.2.
I hope that you solve this problem like this way.