Following (Hsu and Glass, 2006), we also consider features derived from the HMM-LDA word topic labels.
1 we compute the empirical probability t that the target word of the n-gram Feature of the i think k means the sun this is a a lot of big o of e m f Random 0.03 0.32 0.33 0.19 0.53 0.24 0.37 0.80 log(c) 9.29 8.09 3.47 5.86 6.82 7.16 3.09 4.92 f doc 1.00 0.93 0.00 0.18 0.92 0.76 0.00 0.04 f course 1.00 1.00 0.06 0.56 0.94 0.94 0.06 0.06 f speaker 0.83 0.70 0.00 0.06 0.41 0.55 0.01 0.00 h doc 0.96 0.84 0.00 0.56 0.93 0.85 0.00 0.34 h course 0.75 0.61 0.00 0.55 0.78 0.65 0.00 0.00 h speaker 0.76 0.81 0.00 0.09 0.65 0.80 0.12 0.00 t doc 0.00 0.00 0.91 1.00 0.01 0.00 0.00 0.04 t course 0.00 0.00 0.88 0.28 0.01 0.00 0.00 1.00 t speaker 0.00 0.00 0.94 0.92 0.01 0.00 0.09 0.99 is labeled as a topic word.