DensePose, CSE, Convert embedding to SMPL surface point - (nearest vertex or simillar?)

[mureva]

How do we convert the 16-channel embedding into a meaningful number (e.g. nearest vertex?) I'm using the model trained on humans, thus I know the embedding in some way maps to points on the surface of the SMPL model, but is there a function in the API to get back e.g. SMPL vertex index from the embedding?

background:
I'm playing around a bit with fitting SMPL back into the segmentations I get from DensePose on multiple views. I have a script that will apply the DensePose model and output the IUV data in a format suitable for loading into my fitter. However, what with various flaws in the output (like left-right swaps on the feet) I want to try fitting to the CSE output instead - but thus need to know how that embedding maps to a coordinate on the SMPL model's surface (nearest vertex or some such thing).