That’s a great lead, Thomas.  Most of the projects that I’ve seen are in an unspecified state, and I’d rather stay close to mainstream.
Now if there’s a way to parallel functionality of the Python interfaces with C++, I’ll be on track.
It seems like there should be a lot of fast C++ code for Mask RCNN and instance segmentation, given all the interest in self-driving cars.  C++ would help reaction times.