Since LocLDA does not identify aspect-specific opinion words, we consider the following two baseline methods that can identify aspect-specific opinion words: BL-1: In this baseline, we start with all adjectives as candidate opinion words, and use mutual information (MI) to rank these candidates.
given an aspect t, we rank the candidate words according to the following scoring function: where V t is the set of the top-100 frequent aspect words from φ A,t .