  def testBoostedTreesMakeStatsSummarySecurity(self):
    node_ids = [1, 2]
    gradients = [[]]
    hessians = [[0.2], [0.1]]
    bucketized_features_list = [[1], [2]]
    max_splits = 3
    num_buckets = 3
    with self.assertRaises((errors.InvalidArgumentError, ValueError)):
      gen_boosted_trees_ops.boosted_trees_make_stats_summary(
          node_ids=node_ids,
          gradients=gradients,
          hessians=hessians,
          bucketized_features_list=bucketized_features_list,
          max_splits=max_splits,
          num_buckets=num_buckets)
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.