code: def pytorch_hello_world(dataset_url="file:///tmp/external_dataset"):
      with DataLoader(make_batch_reader(dataset_url)) as train_loader:
          sample = next(iter(train_loader))
          # Because we are using make_batch_reader(), each read returns a batch of rows instead of a single row
          print("id batch: {0}".format(sample["id"]))
  
label_desc: Use image node_id 1 for calling a global function with example usage: pytorch_hello_world(dataset_url) without return types