The conditional probability is calculated by:   1 if candidate pair is coreferent and antecedent is the semantic argument ARG0 of predicate run 0 else In our system, a set of pre-processing components including a POS tagger (Giménez & Màrquez, 2004), NP chunker (Kudoh & Matsumoto, 2000) and the Alias-I LingPipe Named Entity Recognizer 2 is applied to the text in order to identify the noun phrases, which are further taken as referring expressions (REs) to be used for instance generation.
we use automatically extracted noun phrases, rather than assuming perfect NP chunking.