  def testBoostedTreesCalculateBestGainsPerFeatureSecurity(self):
    node_id_range = [1, 2]
    stats_summary_list = [[[[]]]]
    l1 = [1.0]
    l2 = [1.0]
    tree_complexity = [1.0]
    min_node_weight = [1.17]
    max_splits = 1
    with self.assertRaises((errors.InvalidArgumentError, ValueError)):
      gen_boosted_trees_ops.boosted_trees_calculate_best_gains_per_feature(
          node_id_range=node_id_range,
          stats_summary_list=stats_summary_list,
          l1=l1,
          l2=l2,
          tree_complexity=tree_complexity,
          min_node_weight=min_node_weight,
          max_splits=max_splits)
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.