Installation Of Python And Dependencies

Make sure your GPU drivers are up to date
Install Python 3.8.6 from the official website
In CMD, run pip install torch==1.8.1+cu111 torchvision==0.9.1+cu111 -f https://download.pytorch.org/whl/torch_stable.html
Run pip install opencv-python sk-video imageio

This should be sufficient to run RIFE and other Pytorch-based networks on any modern GPU, including the RTX 3000 (Ampere) series.

Troubleshooting

If you are getting some kind of numpy error, try downgrading it to 1.19.3:

pip install numpy==1.19.3