code: def objective(z, x):
      """Objective."""
      num_tr_data_to_use = get_tr_dataset_size_from_z0(z[0])
      return rfr_train_and_validate(
          x,
          DATA,
          num_tr_data_to_use,
          MAX_TR_DATA_SIZE,
          MAX_VA_DATA_SIZE,
      )
  
label_desc: Use image node_id 1 for calling a global function with example usage: objective(z, x) and returns: rfr_train_and_validate