Disable `pbar` for DDP ranks > 0 (#7440)

utils/datasets.py

@@ -522,7 +522,7 @@ class LoadImagesAndLabels(Dataset):
             self.im_hw0, self.im_hw = [None] * n, [None] * n
             fcn = self.cache_images_to_disk if cache_images == 'disk' else self.load_image
             results = ThreadPool(NUM_THREADS).imap(fcn, range(n))
-            pbar = tqdm(enumerate(results), total=n, bar_format=BAR_FORMAT)
+            pbar = tqdm(enumerate(results), total=n, bar_format=BAR_FORMAT, disable=LOCAL_RANK > 0)
             for i, x in pbar:
                 if cache_images == 'disk':
                     gb += self.npy_files[i].stat().st_size