  def testBoostedTreesCalculateBestFeatureSplitSecurity(self):
    node_id_range = [1, 2]
    stats_summary = [[[[]]]]
    split_type = 'equality'
    l1 = [1.0]
    l2 = [1.0]
    tree_complexity = [1.0]
    min_node_weight = [1.17]
    logits_dimension = 5
    with self.assertRaises((errors.InvalidArgumentError, ValueError)):
      gen_boosted_trees_ops.boosted_trees_calculate_best_feature_split(
          node_id_range=node_id_range,
          stats_summary=stats_summary,
          l1=l1,
          l2=l2,
          tree_complexity=tree_complexity,
          min_node_weight=min_node_weight,
          logits_dimension=logits_dimension,
          split_type=split_type)
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.