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Tiankai Yang

University of Southern California

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#artificial intelligence Preprint Oct 2026

SynCo: Data Synthesis Co-Training for Self-Evolving LLMs via Multi-Agent Reinforcement Learning

Self-evolving LLM agents promise to improve autonomously through continual interaction and learning, reducing their dependence on manually curated supervision. Realizing this promise requires not only updating the agent, but also evolving its training experience as its capabilities change. However, most existing pipeli...

Wei Yang, Shawn Li, Yuehan Qin et al. · 0 citations
#artificial intelligence Preprint Sep 2026

FlexRouter: Learning Complementary Model Sets for Flexible LLM Routing

Existing Large Language Model (LLM) routing methods score LLMs independently to select top-$k$ models. However, this ignores model correlations and enforces a rigid computational budget. Consequently, routers often select redundant models that share failure modes, limiting the overall probability of success. To address...

Wang Wei, Harry Yang, Tiankai Yang et al. · 3 citations
#artificial intelligence Preprint Sep 2026

Beyond Top-$k$ Skill Retrieval: Diversity-Aware Skill Routing for LLM Agents

Diverse Skill Routing is proposed, a diversity-aware reranking framework that uses a Determinantal Point Process to balance relevance and non-redundancy and improves recall and full coverage over a strong pointwise reranking baseline, with larger gains on multi-skill queries.

Wang Wei, Tiankai Yang, Samyadeep Basu et al. · 2 citations

DOG-DPO:Dynamic Optimization in Geometry for Safety Alignment

DOG-DPO is proposed, a training-free data selection framework that treats preference pairs as structured geometric signals and recovers most of the safety gains of full-data training while remaining entirely teacher-free, training-free, and substantially faster than representative selection baselines.

Yi Nian, Tiankai Yang, Yudi Zhang et al. · 1 citation
Preprint Aug 2026

HyperSkill: Self-Evolving LLM Agents via Hypergraph-Structured Skill Memory

This work proposes HyperSkill, a hypergraph-based memory framework that jointly improves what to store, how memory is structured and retrieved, and how memory evolves, and represents memory as a hypergraph with two node types, subtask steps and reusable skills.

Ruiyao Xu, Tiankai Yang, Wei-Chieh Huang · 5 citations

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