Before revision:  While existing NA methods are homogeneous (they can only account for a single node type and a single edge type) , we generalize  a state-of-the-art homogeneous graphlet-based NAmethod into its heterogeneous counterpart.
After revision:  While existing NA methods are homogeneous (they can only account for a single node type and a single edge type) , we generalize S^3, a state-of-the-art homogeneous graphlet-based NAmethod into its heterogeneous counterpart.