Neural Ideal Point Estimation Network

Authors

  • Kyungwoo Song Korea Advanced Institute of Science and Technology
  • Wonsung Lee Korea Advanced Institute of Science and Technology
  • Il-Chul Moon Korea Advanced Institute of Science and Technology

Keywords:

Ideal point estimation, Legislative voting, Variational autoencoder

Abstract

Understanding politics is challenging because the politics take the influence from everything. Even we limit ourselves to the political context in the legislative processes; we need a better understanding of latent factors, such as legislators, bills, their ideal points, and their relations. From the modeling perspective, this is difficult 1) because these observations lie in a high dimension that requires learning on low dimensional representations, and 2) because these observations require complex probabilistic modeling with latent variables to reflect the causalities. This paper presents a new model to reflect and understand this political setting, NIPEN, including factors mentioned above in the legislation. We propose two versions of NIPEN: one is a hybrid model of deep learning and probabilistic graphical model, and the other model is a neural tensor model. Our result indicates that NIPEN successfully learns the manifold of the legislative bill's text, and NIPEN utilizes the learned low-dimensional latent variables to increase the prediction performance of legislators' votings. Additionally, by virtue of being a domain-rich probabilistic model, NIPEN shows the hidden strength of the legislators' trust network and their various characteristics on casting votes.

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Published

2018-04-26

How to Cite

Song, K., Lee, W., & Moon, I.-C. (2018). Neural Ideal Point Estimation Network. Proceedings of the AAAI Conference on Artificial Intelligence, 32(1). Retrieved from https://ojs.aaai.org/index.php/AAAI/article/view/11852

Issue

Section

Main Track: Machine Learning Applications