Feature f 10 (ent i , tok i ) measures the weighted overlap similarity between the token contexts (tok-cxt) of token tok i and entity ent j .
we use a weighted generalization of the standard overlap coefficient, WO, between two sets X, Y of weighted elements, X k ∈ X and Y k ∈ Y : We set the weights to be tf-idf scores, and hence we obtain: f 10 (ent i , tok i ) = WO tok-cxt(ent i ), tok-cxt(tok i ) Entity-Entity Token Coherence.