3D position GT format of Human3.6M

[karenyun]

Hi, thanks for your great work!
I have a question about how you make the 3D GT of human3.6M. In the paper, it describes that the 3D pose is zero-centre around the hip joint, my question is whether the GT position values are in the camera space, and the GT of other joints is the format as (Xj - Xhip, Yj - Yhip, Zj - Zhip)?
Could you give some suggestion? Thanks very much!