Update README.md

README.md

@@ -378,7 +378,7 @@ full_flat_ds = full_flat_ds.select_columns([c for c in full_flat_ds.column_names
 device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
 ds_torch = full_flat_ds.with_format("torch", device=device)  # other options: "jax", "tensorflow" etc.
 
-for batch in DataLoader(ds_torch, batch_size=4):
+for batch in DataLoader(ds_torch, batch_size=4, num_workers=4):
     print(batch)
     break
 ```