Table 4 compares our kernel-based structural model with the previous state-of-the-art systems for answer sentence selection.
we compare with four most recent state of the art answer sentence reranker models (Wang et al., 2007;Heilman and Smith, 2010;Wang and Manning, 2010;Yao et al., 2013), which report their performance on the same questions and candidate sets from TREC 13 as provided by (Wang et al., 2007).