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Ziheng Li

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Open access Sep 2026

A Graph Convolutional Network with Attention Mechanism for Bus Arrival Time Prediction

This paper designs a Dual-Branch Spatio-Temporal Graph Convolutional Network with Transformer with a robust loss function to suppress the effect of extreme outliers and proposes a feature-separation prediction method for bus arrival time.

Yuan-Yuan Zhi, Xu-Fei Zhuang, Ziheng Li et al. · 0 citations

To Mix or To Merge: Toward Multi-Domain Reinforcement Learning for Large Language Models

The RLVR across domains exhibits small mutual interferences, and reasoning-intensive domains have mutually synergistic effects, and the internal mechanisms from the perspectives of information constraints, model prediction behavior and self-verification are analyzed.

Haoqing Wang, Xiang Long, Ziheng Li et al. · 11 citations
#artificial intelligence Preprint Feb 2026

Not All Preferences Deserve Gradients: Understanding Gradient Utility in Offline Reasoning Alignment

SAGE (Stability-Aware Gradient Efficiency), which maintains difficulty-stratified candidate pools refreshed during training and selects pairs within each pool by a forward-pass signal-to-curvature score, outperforms full-data and size-matched baselines while producing substantially smoother optimization trajectories.

Hui Wu, Hengyi Cai, Jin-Man Zhao et al. · 0 citations

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