why flipping the nodes y coordinates

[iszihan]

Hello,

Going through the codes, I noticed that the nodes' y coordinates are flipped during iterations, and I didn't find any relevant information in the paper. Am wondering if you could give some explanation on the motivation for this? Thank you!

Best, Selena Ling

[shirgur]

This is only because we want to be consistent with "grid_sample" and "renderer" axis directions