Previous studies (Collobert and Weston, 2008;Dong et al., 2015;Luong et al., 2016;Liu et al., 2018;Yang et al., 2017) have proven that MTL is an effective approach to boost the performance of related tasks such as MT and parsing.
most of these previous efforts focused on tasks and languages which have sufficient labeled data but hit a performance ceiling on each task alone.