# Xin DU Assistant Professor, School of Fundamental Science and Engineering Waseda University, Tokyo, Japan I work with Professor Kumiko Tanaka-Ishii on complex-systems approaches to understanding natural language and autoregressive language models. I’m also investigating financial econometrics and risk modeling from a complex-system perspective. [Lab homepage](https://ml-waseda.jp ) [研究室HP](https://ja.ml-waseda.jp) # Selected Publications **Language and Complexity** - Xin Du and Kumiko Tanaka-Ishii. Correlation Dimension of Autoregressive Large Language Models. _NeurIPS 2025_ - Xin Du and Kumiko Tanaka-Ishii. Correlation Dimension of Natural Language in A Statistical Manifold. _Physical Review Research. 2024_ - Xin Du and Kumiko Tanaka-Ishii. FIRE: Semantic Field of Words Represented as Nonlinear Functions. _NeurIPS 2022_ **Retrieval, Clustering** - Xin Du and Kumiko Tanaka-Ishii. Information-Theoretic Generative Clustering of Documents. _AAAI 2025_ - Xin Du, Lixin Xiu, and Kumiko Tanaka-Ishii. Bottleneck-Minimal Indexing for Generative Document Retrieval. _ICML 2024 Oral_ **Finance and Language** - Xin Du and Kumiko Tanaka-Ishii. Stock embeddings acquired from news articles and price history, and an application to portfolio optimization. _ACL 2020_ - Xin Du and Kumiko Tanaka-Ishii. Stock portfolio selection balancing variance and tail risk via stock vector representation acquired from price data and texts. _Knowledge-Based Systems_