Building Torch-vision from Source - Missing CSRC Directory

Hello! I am trying to build torch-vision from source. I simply clone the GitHub repository and then run python install. However, when I go to the install destination I cannot locate the CSRC folder as in here torchvision/csrc. Am I missing a requirement?

The csrc directory contains the C++ and CUDA source code and won’t be copied to the install folder. The methods should however be available in the built library and you could check it via e.g. nm -D /PATH/TO/VISION/ | grep -i roi_align or any other kernel name defined in csrc.