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Zhenyu Lei

المنشورات 3

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AdaST: Adaptive Coupling for Spatial-Temporal Forecasting

Zhenyu Lei, Chenghao Liu, Yushun Dong وآخرون · 2026

Spatial-temporal (ST) forecasting underpins many real-world systems such as traffic, climate, and energy networks. While existing methods implicitly assume strong spatiotemporal coupling, we observe that real-world ST data exhibits distinct coupling regimes, ranging from temporal-dominated and spatial-dominated to stro …

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Grounding Memory Summarization in Utility Intent

Zhenyu Lei, Mingjia Shi, Xingbo Fu وآخرون · 2026

Existing summarizers for memory systems are typically optimized for human-facing criteria such as faithfulness, which misaligns with their true objective: preserving the evidence needed to support future queries. We show that conditioning summarization on query-answer pairs substantially improves answer quality, and th …

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TeacherGRPO: Closing the Capacity Gap in Reasoning Distillation via Teacher Alignment

Zhenyu Lei, Zihan Chen, Yaochen Zhu وآخرون · 2026

Reasoning distillation from powerful teacher models to smaller students faces the Gap Curse: as teachers grow more sophisticated, their complex distributions increasingly diverge from what students can approximate, causing performance degradation. Existing mitigation strategies either filter out challenging examples th …

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