4 papers
Penalty-Based First-Order Methods for Bilevel Optimization with Minimax and Constrained Lower-Level Problems
Yiyang Shen, Yutian He, Weiran Wang +1
We study a class of bilevel optimization problems in which both the upper- and lower-level problems have minimax structures. This setting captures a broad range of emerging applica…
Reinforcement Learning-based Semi-supervised Knowledge Distillation with LLM-as-a-Judge
Yiyang Shen, Lifu Tu, Weiran Wang
Reinforcement Learning (RL) substantially improves the reasoning capabilities of language models, but most existing RL fine-tuning approaches rely entirely on ground-truth verifiab…
Disentanglement of Variations with Multimodal Generative Modeling
Yijie Zhang, Yiyang Shen, Weiran Wang
Multimodal data are prevalent across various domains, and learning robust representations of such data is paramount to enhancing generation quality and downstream task performance.…
A Semi-supervised Generative Model for Incomplete Multi-view Data Integration with Missing Labels
Yiyang Shen, Weiran Wang
Multi-view learning is widely applied to real-life datasets, such as multiple omics biological data, but it often suffers from both missing views and missing labels. Prior probabil…