what's the value of 915 stand for in the line 32 of the calculate_mupots_depth.py? thanks for your amazing work.

There is something that confuses me. There is a value of 915 in line 32 in the calculate_mupots_depth.py, what does it represent, and how is it derived?
p2d = torch.from_numpy(p2d).cuda() / 915