Zichao Yang, Diyi Yang and et al.
NAACL 2016 full paper
[http://www.aclweb.org/anthology/N16-1174]
Duyu Tang, Bing Qin, Ting Liu
EMNLP 2015 full paper
[http://www.aclweb.org/old_anthology/D/D15/D15-1167.pdf]
There are four models (RNN_CNN, CNN_RNN, HNN, HAN) in model/hn_doc.py.