There are other studies focused on joint learning with sentiment (Luo et al., 2015;Mohtarami et al., 2013), emotion in tweets or blog (Hasegawa et al., 2013;Qadir and Riloff, 2014;Ou et al., 2014;Quan and Ren, 2009), and emotional lexicon construction Staiano and Guerini, 2014;Mohammad and Turney, 2013).
it means that the consideration of terminal node improves the performance of the tree kernel significantly.