Given the above definitions, our objective function is to maximize the score of entity linking, relation extraction and their coherence among them: where α, β and δ are weighting parameters tuned on development set.
we first apply an open information extractor (Angeli et al., 2015) on the English Wikipedia to construct a repository of <argument 1 , relation, argument 2 > triples, where the arguments are entity phrases found in the input sentence and the relation represents certain relationship between the arguments.