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Di Zhang

3 papers indexed

arxivcs.LGcs.DC2026-07-16

LongStraw: Long-Context RL Beyond 2M Tokens under a Fixed GPU Budget

Changhai Zhou, Kieran Liu, Yuhua Zhou, Qian Qiao, Jun Gao, Harry Zhang, et al.

A widening gap separates million-token inference from RL post-training, which remains at 256K tokens or below. The gap matters for AI agents, whose observations, tool outputs, documents, and decisions accumulate over long trajectories. Unlike inference, GRPO scores and backpropag…

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arxiveess.SP2026-07-14

Positional Attention-based Graph Neural Network for Learning Permutation Non-equivariant Wireless Policies

Baichuan Zhao, Chenyang Yang, Jianyu Zhao, Di Zhang

Graph neural networks (GNNs) have emerged as a promising approach to learning wireless policies efficiently by leveraging topology prior and incorporating relational inductive biases. However, when the optimal policy is not permutation equivariant (PE), conventional GNNs suffer f…

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arxivcond-mat.mtrl-scics.AIphysics.chem-ph2026-06-30

From Materials Database to Materials Bank: Assetizing Data for AI Driven Materials Innovation

Chenyao Ma, Di Zhang, Weibo Gong, Wei Du, Rui Su, Yuhang Chen, et al.

Driven by high-throughput experimentation, computational modeling, and artificial intelligence (AI), materials data has expanded at an unprecedented rate. Conventional materials databases function only as passive repositories, archiving raw experimental records indiscriminately i…

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