Author

Xian-Cong Ren

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Preprint Sep 2026

Dream4ACT: A Shared Visual Action Interface for Multi-Embodiment Video-Action Modeling

Video generation models (VGMs) offer strong spatiotemporal priors for embodied observation--action modeling. However, joint-space action vectors lack explicit image-space structure and vary in dimensionality and semantics across embodiments, making it challenging to directly leverage the rich spatiotemporal priors of V...

Xiang-Yu Zhu, Jin Xu, Yue (Sophie) Guo et al. · 0 citations

#artificial intelligence May 2026

VLA-Trace: Diagnosing Vision-Language-Action Models through Representation and Behavior Tracing

VLA-Trace is presented, a progressive diagnostic framework that analyzes VLA models through a unified evidence chain from representation dynamics to causal control attribution and behavioral manifestation to highlight future directions for representation-preserving adaptation, causal VLA circuits, and compositional sem...

Haoyuan Shi, Xian-Cong Ren, Yingji Zhang et al. · arXiv.org · 3 citations