I tried twice from scratch of the GUI.py provided, but I haven't seen this error before, and no idea what's the reason. The Qt platform seems can't be initialized, even though I finished to compile cython.
No PyTorch with Metal backend found. Try one of:
conda install pytorch torchvision torchaudio -c pytorch-nightly
pip3 install --pre torch torchvision torchaudio --extra-index-url https://download.pytorch.org/whl/nightly/cpu
[<pyopencl.Device 'NVIDIA GeForce RTX 3090' on 'NVIDIA CUDA' at 0x5628d2175d50>]
Using OpenCL lab2rgb
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
Available platform plugins are: vnc, minimal, vkkhrdisplay, eglfs, wayland-egl, linuxfb, wayland, offscreen, minimalegl, xcb.
Aborted (core dumped)
QT_QPA_PLATFORM=offscreen
and install pip install opencv-python-headless found on NVlabs/instant-ngp#300 doesn't work for me