code: def get_node(dataset, node):
      
      
      if node is None:
          
          cur_dir = os.path.dirname(os.path.realpath(__file__))
          data_dir = os.path.join(cur_dir, "..", "data")
          dataset_path = os.path.join(data_dir, "datasets.json")
          
          with open(dataset_path, "r") as f:
              datasets = json.loads(f.read())
          
          node = datasets[dataset].upper()
      
      return node
docs: .. todo:: Move to more appropriate place in module.