TTA augument boxes one pixel shifted in de-flip ud and lr (ultralytic…

…s#2219)

* TTA augument boxes one pixel shifted in de-flip ud and lr

* PEP8 reformat

Co-authored-by: Jaap van de Loosdrecht <jaap.van.de.loosdrecht@nhlstenden.com>
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

models/yolo.py

@@ -110,9 +110,9 @@ def forward(self, x, augment=False, profile=False):
                 # cv2.imwrite(f'img_{si}.jpg', 255 * xi[0].cpu().numpy().transpose((1, 2, 0))[:, :, ::-1])  # save
                 yi[..., :4] /= si  # de-scale
                 if fi == 2:
-                    yi[..., 1] = img_size[0] - yi[..., 1]  # de-flip ud
+                    yi[..., 1] = img_size[0] - 1 - yi[..., 1]  # de-flip ud
                 elif fi == 3:
-                    yi[..., 0] = img_size[1] - yi[..., 0]  # de-flip lr
+                    yi[..., 0] = img_size[1] - 1 - yi[..., 0]  # de-flip lr
                 y.append(yi)
             return torch.cat(y, 1), None  # augmented inference, train
         else: