The cluster-ranking model has a very complex structure and modifying it to take into account the merging features was impractical, such that we decided to leave this as future work.
we decided to create a new threedimensional vector, one dimension for each semantic feature: i) if the entities of the two mentions are the same, ii) if the type of the two mentions are the same, and iii) if the type of one mention is included into the hierarchy of the other one.