Revise to be consistent with the paper

viz/renderer.py

@@ -379,14 +379,14 @@ class Renderer:
                             distance < round(r1 / 512 * h))
                         direction = direction / \
                             (torch.linalg.norm(direction) + 1e-7)
-                        gridh = (relis-direction[1]) / (h-1) * 2 - 1
-                        gridw = (reljs-direction[0]) / (w-1) * 2 - 1
+                        gridh = (relis+direction[1]) / (h-1) * 2 - 1
+                        gridw = (reljs+direction[0]) / (w-1) * 2 - 1
                         grid = torch.stack(
                             [gridw, gridh], dim=-1).unsqueeze(0).unsqueeze(0)
                         target = F.grid_sample(
                             feat_resize.float(), grid, align_corners=True).squeeze(2)
                         loss_motion += F.l1_loss(
-                            feat_resize[:, :, relis, reljs], target.detach())
+                            feat_resize[:, :, relis, reljs].detach(), target)
 
                 loss = loss_motion
                 if mask is not None: