Author

Ziheng Li

2 papers indexed here

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Open access Sep 2026

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

Accurate prediction of bus arrival time is critical to improving transit service reliability and scheduling efficiency. The estimated time of arrival (ETA) is jointly determined by two processes, namely inter-station travel and station dwell, which are dominated by different traffic mechanisms and thus follow essential...

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