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Author

Yu Chen

Tsinghua University

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#machine learning Preprint Oct 2026

Towards Understanding the Training of GFlowNets: A Theoretical Perspective

Generative Flow Networks (GFlowNets) learn policies that sample discrete objects in proportion to a positive reward. They are trained by minimizing balance objectives, whose exact satisfaction guarantees correct sampling. However, a comprehensive theory linking nonzero balance loss and approximate stationarity to sampl...

Rui Hu, Yu Chen, Zhuo-Ran Li et al. · 0 citations
#artificial intelligence Preprint Aug 2026

Optimal Skill Selection for LLM Agents with Provable Bicriteria Guarantees

Loading reusable skill documents into a bounded context window has become a primary way large language model (LLM) agents acquire task-specific capabilities, which makes skill selection a first-order determinant of task performance and token cost. Yet current agents score skills independently by semantic relevance and...

Yu Chen, Rui-Shuo Chen, Xun Wang et al. · 2 citations
#artificial intelligence Preprint Sep 2026

FlexLoop: Depth-Elastic Looped Policies for Adaptive Test-Time Computation in Deep RL

FlexLoop is proposed, a novel post-training framework that converts pretrained fixed-depth looped policies into depth-elastic policies that supports reliable inference across recurrent depths and enables state-wise adaptive inference through recurrent-depth consistency.

Xun Wang, Rui-Shuo Chen, Yu Chen et al. · 0 citations
Preprint Aug 2026

AV-AIVAT: 74x Cheaper Agent Evaluation with Certified Anytime-Valid Stopping in Imperfect-Information Games

AV-AIVAT turns variance reduction into efficient, auditable early stopping while separating asymptotic screening from exact certification, so an evaluation can stop the moment its evidence suffices and hand a third party everything needed to recheck the verdict at that very stopping time.

Bo-Ning Li, Yu Chen, Long-Bo Huang · 1 citation
Preprint Aug 2026

Lipschitz Bandits with Arbitrary Feedback Delays

The authors' bounds match existing delay-free regret guarantees for Lipschitz bandits and characterize the additional $\tilde{O}(\sqrt{D})$ impact introduced by feedback delays.

Yu-Hao Liu, Yu Chen, Long-Bo Huang · 0 citations
#artificial intelligence Preprint Sep 2026

The Router Within: Eliciting Native Skill Routing from a Frozen LLM

It is shown that the frozen agent LLM already carries the routing signal in its own forward passes, and that two linear maps suffice to read it out with no skill text in the context, and Gavel (Glance And Verdict from a frozen LLM) reads it in two steps.

Rui-Shuo Chen, Xun Wang, Yu Chen et al. · 3 citations · ⚡1

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