Update train.py `import val as validate` (#9037)

train.py

@@ -36,7 +36,7 @@ if str(ROOT) not in sys.path:
     sys.path.append(str(ROOT))  # add ROOT to PATH
 ROOT = Path(os.path.relpath(ROOT, Path.cwd()))  # relative
 
-import val  # for end-of-epoch mAP
+import val as validate  # for end-of-epoch mAP
 from models.experimental import attempt_load
 from models.yolo import Model
 from utils.autoanchor import check_anchors
@@ -347,7 +347,7 @@ def train(hyp, opt, device, callbacks):  # hyp is path/to/hyp.yaml or hyp dictio
             ema.update_attr(model, include=['yaml', 'nc', 'hyp', 'names', 'stride', 'class_weights'])
             final_epoch = (epoch + 1 == epochs) or stopper.possible_stop
             if not noval or final_epoch:  # Calculate mAP
-                results, maps, _ = val.run(data_dict,
+                results, maps, _ = validate.run(data_dict,
                                                 batch_size=batch_size // WORLD_SIZE * 2,
                                                 imgsz=imgsz,
                                                 half=amp,
@@ -407,12 +407,12 @@ def train(hyp, opt, device, callbacks):  # hyp is path/to/hyp.yaml or hyp dictio
                 strip_optimizer(f)  # strip optimizers
                 if f is best:
                     LOGGER.info(f'\nValidating {f}...')
-                    results, _, _ = val.run(
+                    results, _, _ = validate.run(
                         data_dict,
                         batch_size=batch_size // WORLD_SIZE * 2,
                         imgsz=imgsz,
                         model=attempt_load(f, device).half(),
-                        iou_thres=0.65 if is_coco else 0.60,  # best pycocotools results at 0.65
+                        iou_thres=0.65 if is_coco else 0.60,  # best pycocotools at iou 0.65
                         single_cls=single_cls,
                         dataloader=val_loader,
                         save_dir=save_dir,