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Wei Lu

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#natural language process... Preprint Oct 2026

To Reason but Not to Stop: Understanding and Recovering Pruned Large Reasoning Models

Weight pruning can degrade the accuracy of large reasoning models (LRMs), yet it remains unclear whether it damages reasoning itself. We find that much of this degradation stems from a failure to stop rather than to reason. As sparsity increases, pruned LRMs increasingly fail to terminate within the token budget, often...

Minh-Anh Nguyen, Nguyen T. Ha Lan, Xiyan Fu et al. · 0 citations

Safety Paradox: How Enhanced Safety Awareness Leaves LLMs Vulnerable to Posterior Attack

This work formalizes the Safety Paradox, analytically showing that monotonic improvements in safety alignment naturally amplify posterior vulnerability, and establishes a causal link via reinforcement learning interventions, exemplifying that artificially degrading a model's safety judgment immunizes it against the att...

Ho-Ang P. Long, H. V. Le, Shaoyang Xu et al. · 0 citations

Multilingual Fine-Tuning via Localized Gradient Conflict Resolution

Bucket-Level MOO is introduced, a scalable distributed framework that applies gradient-based MOO algorithms locally, within the parameter buckets of distributed training, that enables conflict-aware updates without ever materializing a full gradient vector for any objective, and improves multilingual performance over s...

Ho-Ang P. Long, Yiran Zhao, Wei Lu et al. · 0 citations
Jul 2026

DT-Guard: Intent-Driven Reasoning-Active Training for Reasoning-Free LLM Safety Guardrail

DT-Guard is presented, a content safety guardrail model based on a Reasoning-Active Training, Reasoning-Free Inference paradigm, which demonstrates that reasoning supervision can be effectively internalized into low-latency safety discrimination.

Heng-Xiang Liu, Changtao Miao, Xinjie Yang et al. · 0 citations

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