There have been several successful attempts at sentiment polarity detection in the past (Turney, 2002;Pang et al., 2002;Pang and Lee, 2004;Mohammad et al., 2013;Svetlana Kiritchenko and Mohammad, 2014).
prediction of star ratings still considered as a challenging task (Qu et al., 2010;Gupta et al., 2010;Boteanu and Chernova, 2013).