Training a Model for Depth Map Estimation

@PAULYZHENG , I appreciate you releasing the checkpoints. I'd be very interested in seeing your training script to help me train my dataset for depth map estimation. Would you be willing to share it? This would greatly benefit my academic project.

The issue requests a training script for the depth map estimation work in the HairStep repository, but names no file, entry point, or test. First inspect the repository for existing training-related files and determine whether the requested script is in scope; done would mean a usable script for training on a custom dataset.

Written by the indexing model from the issue text.