3D hand point

Hi, everyone, I check the paper of hamer, which said they have the ability to visualize 3D keypoint, and I check the demo.py, sure I can see the output of each batch, containing 3D keypoint, but the point I got is absolutely small, almost e-03, does anyone know why? I want to change some of the data in the predicted one so I need to get the correct one before visualize them.