Author

Y. Liu

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Preprint Oct 2026

Frozen in a Frame: The Velocity Blind Spot in JEPA World Models

Joint-embedding predictive architectures (JEPAs) for world modeling train an encoder so a predictor maps a current embedding and action to the next frame's embedding, always from a single rendered frame. This has a structural blind spot: a renderer without motion blur draws a scene from configuration alone, so a single...

Ting-He Zhang, Chun-Yu Liu, Y. Liu et al. · 0 citations

#machine learning Preprint Oct 2026

Revealing After Overwriting: An Exponential POMDP OPE Lower Bound under History-Dependent Logging

Multi-step revealing can make off-policy evaluation tractable under memoryless logging. With history-dependent logging, state decodability and target-relevant evidence can separate. For every horizon $H\ge3$, we construct two exactly realizable POMDPs with four actions, at most four states per layer, a known logger, an...

You-Yu Luo, Peng-Zhan Zhou, Zhi-Da Qin et al. · 0 citations