Is there a documentation describing how to change backbone of densepose models?

## 📚 Documentation

I want to replace the backbone of densepose models to MobilenetV2 from Resnet50.
Is there any documentation or example describing it?

The issue names DensePose models and the ResNet50-to-MobileNetV2 backbone change, but no file, test, or entry point. Start by locating the existing DensePose documentation or examples and the configuration that selects the backbone. Done means documenting a reproducible way to make this replacement, with an example if one is needed.

Written by the indexing model from the issue text.