Questions about pre-trained loss and supplementary material

[ReekiLee]

Hello!
Thanks for your great work!
I have a question about pre-train loss. When pre-training flow network unsupervisedly, flow network and depth-pose network are trained respectively using the same loss functions to jointly training, right? And I wonder that do all unsupervised networks need pre-training?
By the way, I try to find the supplemetary material but I failed. Could you tell me where to find it?
Thanks in advance!