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Fang Wan

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Preprint Sep 2026

ActionUNet: Improving Robustness of VLA Models with Efficient Multi-scale Fine-tuning

Vision-Language-Action (VLA) models have shown great promise for robotic manipulation by mapping multi-modal semantics to physical actions. However, this mapping inherently struggles to align these coarse-grained semantics with fine-grained temporal execution. It leaves VLA models with limited generalization and insuff...

Ding-Kun Zhu, Zi-Heng Yan, Fang Wan · 0 citations
#natural language process... Preprint Oct 2026

Sparse Attention Is Matrix Approximation, Not Choosing from a Bag of Values

Large Language Models (LLMs) achieve strong performance across many domains, but their efficiency is limited by the quadratic cost of attention with respect to prompt length. Sparse attention reduces this cost by retaining only a small fraction of query-key interactions to approximate the full attention matrix. However...

Fang Wan, Xu-Feng Liu, Fan Li et al. · 0 citations
Preprint Aug 2026

Vorch-Omni: Multi-Task Orchestration of Sight and Sound

Vorch-Omni is presented, a unified multi-task framework for audio-visual synthesis based on an arbitrary-condition-to-arbitrary-output formulation that supports over 10 tasks, including text-to-video, text-to-audio-video, image- and reference-conditioned generation, temporal extension, audio-driven generation, video tr...

Vorch Team, Xiaoyu Chen, Yang Ding et al. · 0 citations

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