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Junming Zhang

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#machine learning Preprint Oct 2026

AF-Muon: An AdamW-Free Muon Optimizer for Tied-Embedding Models

Muon improves large-scale training by applying a spectral-norm steepest-descent update to matrix parameters, but practical models also contain parameter blocks that do not fit dense-matrix geometry. One important case is the tied vocabulary table, which appears in language models and other token generators and can rece...

Arash Lagzian, Paniz Halvachi, Jun-Ming Zhang et al. · 0 citations
Preprint Aug 2026

Curvature-Aware Zeroth-Order Optimization for Memory-Efficient Test-Time Adaptation

Test-time adaptation (TTA) aims to enhance the cross-domain performance of pre-trained models by adapting to unlabeled test data. While most existing TTA methods rely on backpropagation (BP) for finetuning, BP-free methods such as zeroth-order (ZO) methods are more desired in practical on-device scenarios. ZO methods r...

Junming Zhang, Shuyu Yin, Peilin Liu et al. · 0 citations
#natural language process... Preprint Jul 2026

Search-G1: Grounded Search Agents via Representation-Based Intrinsic Rewards

Experiments show that Search-G1 improves the grounding--search-cost trade-off, producing shorter response-side trajectories at competitive task accuracy and periodically refits both readouts on trajectories from the latest checkpoint, allowing the reward to co-evolve with the policy.

Ruoxi Cheng, Haoxuan Ma, Hongyi Zhang et al. · 0 citations
Jul 2026

Memory Decoder at Scale: A Pretrained, Parametric Long-Term Memory

This work presents Memory Decoder at Scale, scaling memory models up to 6.9B parameters and pretraining them on 300B tokens, demonstrating that independently scaling pretrained memory offers a more parameter efficient path to improving language model performance.

Ru-Bin Wei, Jiaqi Cao, Jiarui Wang et al. · 1 citation

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