Replace path.absolute() with path.resolve() (#4763)

train.py

@@ -26,7 +26,7 @@ from torch.nn.parallel import DistributedDataParallel as DDP
 from torch.optim import Adam, SGD, lr_scheduler
 from tqdm import tqdm
 
-FILE = Path(__file__).absolute()
+FILE = Path(__file__).resolve()
 sys.path.append(FILE.parents[0].as_posix())  # add yolov5/ to path
 
 import val  # for end-of-epoch mAP