In some cases, users may not want to have any global replica of the data being broadcasted/all-reduced. In such cases, set the result_buffer_round to -1 as a flag that this is not necessary and check for it.
In some cases, users may not want to have any global replica of the data being broadcasted/all-reduced. In such cases, set the result_buffer_round to -1 as a flag that this is not necessary and check for it.