Hi @smth, I have a quick question here. So for the flow(which is the grid param in grid_sample), is there a limit on its range? I saw some people said that the grid should be in the range of [-1,1]. Is that true? Because the range of my optical flow is like [-20,20]. So should I divide the flow by 20 before I feed it to the grid_sample function for image warping? And is there anything else to notice about using the grid_sample() function? Thank you very much.