Among them, deep learning-based methods such as CNN (Liu et al., 2017;Kurata et al., 2016), RNN (Liu et al., 2016), combination of CNN and RNN (Lai et al., 2015;Chen et al., 2017), attention mechanism (Yang et al., 2016;You et al., 2018), (Adhikari et al., 2019) and etc., have achieved great success in document representation.
most of them only focus on document representation but ignore the correlation among labels.