Is the segmentation model(upper branch) trained unsupervised during the Iterative Offline Training?

[AXu0511]

Hello, thanks a lot for your excellent work. I have a few questions.
Is the segmentation model(upper branch) trained unsupervised during the Iterative Offline Training?
Does the optical flow output of the lower branch act as the ground truth of the segmentation output during the Iterative Offline Training?