To exploit lexical information, we first compute lexical probabilities.
for each pair of mentions m j and m k in a test text, we first compute two probabilities: (1) the string-pair probability (SP-Prob), which is the probability that the strings of the two mentions, s j and s k , are coreferent; and (2) the head-pair probability (HP-Prob), which is the probability that the head nouns of the two mentions, h j and h k , are coreferent.