We use the same edge weight α for all semantic-dependent edges, and which will be empirically tuned.
given a predicate p, we find its semantically similar predicates as follows: 1) we identify its active/passive verb form as its semantically similar predicate, e.g., 'Y be acquired by X' will be identified as a semantically similar predicate of 'X acquire Y'; 2) we generate semantically similar predicate candidates by replacing each verb/noun in the predicate p with its synonyms/hypernyms in WordNet 3.0.