pointops for windows

Original code repo point-transformer.

I build this repo for directly installing pointops with

pip install "git+https://github.com/QJSQJS/pointops_cuda_windows"

or

cd point_cuda_windows
pip install -e.

Modification:

1. Adapt the code to the Windows system.
2. Comment #include <THC/THC.h> for using pytorch with latest pytorch version.(from--https://github.com/Silverster98/pointops)