Disable shuffle when rect

utils/datasets.py

@@ -108,6 +108,7 @@ def create_dataloader(path, imgsz, batch_size, stride, single_cls=False, hyp=Non
                                       prefix=prefix)
 
     batch_size = min(batch_size, len(dataset))
+    shuffle = shuffle and not rect  # disable shuffle in rect mode to keep the dataset sorted by aspect ratio
     nw = min([os.cpu_count() // WORLD_SIZE, batch_size if batch_size > 1 else 0, workers])  # number of workers
     sampler = torch.utils.data.distributed.DistributedSampler(dataset, shuffle=shuffle) if rank != -1 else None
     loader = torch.utils.data.DataLoader if image_weights else InfiniteDataLoader