3d_joints in the .pkl file

[Justinitaa]

Hello author.
I ran track.py to get a .pkl file, and I read about the contents of that .pkl file at the PHPLP project, and I extracted the contents of a sequence of 3D_joints in one of the frames as shown below, and my understanding is that he is supposed to be the coordinates of the joints of one of the people detected in that frame. There are 45 lines in total, which 45 joints do they correspond to, and the last line looks like the origin of the coordinates, is he the root node? Also, which person in that frame does the output sequence of multiple such joint combinations correspond to? Is the output based on the person's id from smallest to largest? How can I see this? I need to know the joints information clearly, looking forward to your reply, thank you!