Nonlinear Structural Equation Model Guided Gaussian Mixture Hierarchical Topic Modeling HeGang Chen author Pengbo Mao author Yuyin Lu author Yanghui Rao author 2023-07 text Proceedings of the 61st Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers) Anna Rogers editor Jordan Boyd-Graber editor Naoaki Okazaki editor Association for Computational Linguistics Toronto, Canada conference publication chen-etal-2023-nonlinear 10.18653/v1/2023.acl-long.578 https://aclanthology.org/2023.acl-long.578/ 2023-07 10377 10390