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Author

Fangxu Yu

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Jul 2026

Weak-to-Strong On-Policy Distillation

W2S-OPD is introduced, a simple yet effective OPD framework that improves the strong student by distilling from multiple weak models, and outperforms OPD, enables the student to surpass the domain teacher, and keeps improving the student even when every supervision source is weaker.

Fangxu Yu, Zinan Lin, Xiaodong Liu et al. · 7 citations · ⚡1
Jul 2026

TSRouter: Dynamic Modality-Model Selection for Time Series Reasoning

TSRouter, a graph-based dynamic routing framework that demonstrates robust zero-shot plug-and-play generalization to unseen models and novel tasks and preserves high performance while reducing computational overhead through cost-aware optimization.

Fangxu Yu, Tao Feng, De-Hai Min et al. · 3 citations
Preprint Aug 2026

LLMRouter: Unified Infrastructure for Developing, Evaluating, and Deploying LLM Routers

This work presents a unified formulation of LLM routing as a sequential decision process characterized by five components: context encoders, model encoders, scoring functions, decision rules, and learning signals, covering single-turn, multi-turn, and personalized routing.

Tao Feng, Fangxu Yu, Haozhen Zhang et al. · 1 citation

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