OK, I found the repo multimodallearning/pytorch-mask-rcnn and actually they are using my code.
This was also mentioned in the readme 11

We use functions from two more repositories that need to be build with the right  --arch  option for cuda support. The two functions are Non-Maximum Suppression from ruotianluo’s pytorch-faster-rcnn 3 repository and longcw’s RoiAlign 20.

So this is a misunderstanding, and I am very glad that my code is useful to others.