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Sharon Li

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#artificial intelligence Preprint Oct 2026

DiVeR: Decision-Critical Verifier Learning for VLA Test-Time Scaling

Scaling robot data and model capacity has improved Vision-Language-Action (VLA) policies, but further progress is constrained by the high cost of robotic data. Verifier-guided test-time scaling offers an efficient alternative by sampling multiple action candidates and selecting the one most likely to lead to task succe...

Seongheon Park, Heecheol Kim, Shu-Lin Tian et al. · 0 citations
#artificial intelligence Preprint Oct 2026

Sharpening Tax in Post-Training

An emerging hypothesis about reinforcement learning (RL) post-training of large language models (LLMs) is that it merely sharpens existing behaviors of a base model, improving single-shot accuracy at the cost of solution coverage. Although this trade-off has been observed in math and coding tasks, it need not extend to...

Changdae Oh, Qi Zeng, Qi Qi et al. · 0 citations
#artificial intelligence Preprint Sep 2026

AIM: Agentic Idea Management for Automated Research

It is shown that explicit idea-level allocation makes semantic coverage directly controllable, and that broader coverage becomes increasingly valuable when competitive research directions are sparse among many plausible alternatives.

Hyeong Kyu Choi, Bhavana Dalvi, Jie-Feng Chen et al. · 0 citations

Hide-and-Seek in Trajectories: Discovering Failure Signals for VLA Runtime Monitoring

This paper proposes Hide-and-Seek, a framework that formulates VLA failure detection as a coarsely supervised learning problem that achieves state-of-the-art multi-task failure detection performance with a practical accuracy--timeliness trade-off under conformal prediction, and generalizes well to both seen and unseen...

S. Park, Wendi Li, Changdae Oh et al. · 8 citations
#artificial intelligence Preprint Sep 2026

ExecCritic: Learn to Test, Test to Improve for Coding Agents

This work introduces ExecCritic, combining a test--verify--revise scaffold with a role-specific reinforcement learning recipe for training agents within it, separating test construction from source-code repair.

Leitian Tao, Bao-Lin Peng, Hao-Rui Wang et al. · 0 citations
Preprint Jul 2026

TRACE: Turn-level Reward Assignment via Credit Estimation for Long-Horizon Agents

On long-horizon complex search, TRACE substantially improves base-model tool-use ability using pure RL, without a cold-start supervised fine-tuning stage, an agentic mid-training stage, or training on live-web data.

Leitian Tao, Baolin Peng, Wenlin Yao et al. · 4 citations
Jul 2026

Do Unified Multimodal Models Think in One Space? A Lens Through Cross-Branch Steering

It is shown that steering vectors learned from the understanding branch can transfer to generation, enabling controllable image synthesis and improved semantic faithfulness, and establish cross-branch steering as a practical tool for probing multimodal representations.

Yu Wang, Sharon Li · 0 citations
Jul 2026

Multi-Agent LLMs Fail to Explore Each Other

This work introduces Multi- Agent Contextual Exploration (MACE), a lightweight framework that explicitly promotes exploration through structured peer selection that substantially improves exploration behavior and downstream task performance and shows theoretically that the value of exploration increases with agent dive...

Hyeong Kyu Choi, Jiatong Li, Wendi Li et al. · 1 citation

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