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Pei-Lin Zhao

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#artificial intelligence Preprint Sep 2026

Matrix AdaGrad: Row-wise and Column-wise Adaptive Subgradient Methods

Adaptive optimization methods such as AdaGrad and Adam are widely used in modern deep neural network training, but their adaptive scaling is primarily designed for vector-valued parameters and does not explicitly exploit matrix structure. Recent matrix-aware optimizers demonstrate the benefits of structured optimizatio...

Wenpeng Zhang, Run-Sheng Yu, Pei-Lin Zhao · 0 citations
#artificial intelligence Preprint Sep 2026

Rethinking Critic Learning in PPO: Understanding and Mitigating Value Flattening

Value Flattening is identified as an important yet overlooked failure mode of critic learning in standard PPO and a simple sparse supervision strategy can mitigate it; SParse Proximal Policy Optimization is introduced, which applies the value loss to only a few well-separated states in each response to mitigate both ef...

Yi-Zhuo Li, Jian-Hao Yan, Yun Luo et al. · 1 citation
#artificial intelligence Preprint Sep 2026

T-LoopFormer: Token-Level Elastic-Depth Looped Transformers for Latent Reasoning with Dynamic Routing

Looped Transformers have recently demonstrated strong performance in both reasoning and language tasks by reusing a shared set of parameters across multiple iterations, achieving parameter efficiency without sacrificing representational power. Besides, looped Transformers perform inference directly in the latent space...

Ming-Qian Yu, Wen-Peng Zhang, Shao-Bo Cui et al. · 0 citations

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