To run the clustering algorithm, corresponding parts need to be commented and uncommented in the launch files.
Take the EU long-term dataset as an example:
roslaunch package_name bag_play.launch bag:=bag_path
roslaunch package_name eult_clustering.launch
For the depth clustering only:
roslaunch package_name bag_play.launch bag:=bag_path
rosrun depth_clustering show_objects_node --num_beams 32