Yamamoto, Shuhei, and Tetsuji Satoh. 2021. “Hierarchical Estimation Framework of Multi-Label Classifying: A Case of Tweets Classifying into Real Life Aspects”. Proceedings of the International AAAI Conference on Web and Social Media 9 (1):523-32. https://doi.org/10.1609/icwsm.v9i1.14592.