make densepose inference model traceable
make densepose inference model traceable

Summary: make the densepose_inference function tracable.

Reviewed By: bilalsal

Differential Revision: D40399377

fbshipit-source-id: 758792ab7dcc58a9b1d39cf482a2067e9ab6bbbf

facebookresearch/detectron2,facebookresearch/detectron2,facebookresearch/detectron2