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Tu Nguyen

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#artificial intelligence Preprint Oct 2026

A Safe Action Is Not Enough: Feasible-Future Decoding for Vision-Language-Action Policies

A safe action is not necessarily a viable one. A frozen vision-language-action (VLA) policy can favor a locally admissible move that leaves no policy-supported route to safe task completion. We call this the feasibility-likelihood gap: likelihood ranks the next move, while feasibility depends on the futures it leaves o...

Tu Nguyen, Matthieu Zimmer, Vu Anh Vu et al. · 0 citations
#artificial intelligence Preprint Sep 2026

The Weakest Link: Distilling LLM Reasoning with Worst-Case Constrained Reinforcement Learning

Distilling the reasoning capabilities of large language models (LLMs) into smaller students is a central challenge for efficient deployment. Current approaches face a fundamental tension: optimizing purely for verifiable task rewards (e.g., via GRPO) leads to reward hacking, where students arrive at correct final answe...

Matthieu Zimmer, Xiao-Tong Ji, Tu Nguyen et al. · 0 citations
Preprint Aug 2026

LLM as Detector: An In-context Learning Approach for Tabular Anomaly Detection

LLM-Detector is proposed, a framework that utilizes the in-context learning capacity of LLMs for structured, prompt-conditioned scoring synthesis, enabling LLMs to derive anomaly detection logic from structured normal-state knowledge.

Tu Nguyen, Dang Nguyen, T. D. Le et al. · 0 citations

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