This resembles the previous multi-language learning approaches (Naseem et al., 2012;Täckström et al., 2013b;Zhang and Barzilay, 2015;Ammar et al., 2016) that exploited the WALS features.
we use 81A, 82A, 83A, 85A, 86A, 87A, 88A and 89A-a union of WALS features used by those works.