How should I 'manually map' PROX dataset?

[iamyouno]

The paper includes testing the model using the PROX dataset. And on page 12,

As PROX uses SMPL-X human body model [51], we manually map its skeleton joint indexes to ours for transfer learning.

How do you map manually? Is there any relationship with SMPL and skeleton from VirtualHome?

I also want to change data type between SMPL-X and virtualHome skeleton, but it is not going well...