code: def decide_which_users_to_annotate(centrality_vector,
                                     number_to_annotate,
                                     already_annotated,
                                     node_to_id):
      centrality_vector = np.asarray(centrality_vector)
      ind = np.argsort(np.squeeze(centrality_vector))
      if centrality_vector.size > 1:
          reversed_ind = ind[::-1]
      else:
          reversed_ind = list()
          reversed_ind = reversed_ind.append(ind)
      user_id_list = list()
      append_user_id = user_id_list.append
      counter = 0
      for node in reversed_ind:
          user_twitter_id = node_to_id[node]
          if user_twitter_id not in already_annotated:
              append_user_id(user_twitter_id)
              counter += 1
              if counter >= number_to_annotate:
                  break
      return user_id_list