}
  auto x = Parameter(&builder, 0, ShapeUtil::MakeShape(xla::F32, {4, 16}), "x");
  ReplicaGroup group;
  group.add_replica_ids(0);
  group.add_replica_ids(1);
  XlaOp reduce_scatter =
      ReduceScatter(x, to_apply, /*scatter_dimension=*/1, /*shard_count=*/2,
                    /*replica_groups=*/{group});

  std::vector<XlaOp> tuple_values;
  tuple_values.push_back(reduce_scatter);