message: Updated hierarchical_tree_broadcaster.cc
  Fixed uninitialised warning
diff: @@ -62,7 +62,7 @@ int HierarchicalTreeBroadcaster::GetDeviceTask(
  int device_rank, const std::vector<int>& dev_per_task) {
  int num_tasks = static_cast<int>(dev_per_task.size());
  int task_lo = 0;
  - int task_hi;
  + int task_hi = -1;
  for (int ti = 0; ti < num_tasks; ti++) {
  task_hi = task_lo + dev_per_task[ti];
  if (task_lo <= device_rank && device_rank < task_hi) return ti;
  