We also add problem-specific constraints that specify which clusters cannot be merged together, but instead of manually creating the cannot-links between specific words, our cannot-link constraints are automatically calculated during the clustering process.
a few methods have been proposed to identify implicit features, e.g., using co-occurrence associations between implicit and explicit features (Su et al., 2006;Hai et al., 2011;Zhang and Zhu, 2013), or leveraging lexical relations of words in dictionaries (Fei et al., 2012).