Wu, Zhen, Xin-Yu Dai, Cunyan Yin, Shujian Huang, and Jiajun Chen. “Improving Review Representations With User Attention and Product Attention for Sentiment Classification”. Proceedings of the AAAI Conference on Artificial Intelligence 32, no. 1 (April 26, 2018). Accessed October 19, 2021. https://ojs.aaai.org/index.php/AAAI/article/view/12054.