Transferring video-generation features into a VLM set a new state of the art on dynamic spatial reasoning
AspireAI community · arXiv
Dynamic spatial reasoning means tracking how spatial relations change over time while keeping scene state, and it is a known weak point for vision-language models. Video generation models, trained to synthesize temporally coherent world dynamics, already hold rich spatiotemporal representations, and GenDSR transfers their intermediate features into a VLM. Rather than treating a video-generation feature as one monolithic prior, it builds two branches - a raw branch preserving holistic generative context and a delta branch emphasizing temporal variation - then fuses them with task-conditioned token-wise gates and injects the result into the native visual representation. On DSR-Bench GenDSR reached 67.2%, surpassing the previous best result and establishing a new state of the art. The gain is reported on one benchmark against one prior system, so how much comes from the two-branch design rather than the added features is not separated out.
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Two sparse-autoencoder analyses have resisted scaling: matching semantically similar features across layers, and compressing large feature circuits into interpretable supernodes. This paper argues both are the same underlying problem, estimating semantic distances between SAE features that sit on different activation manifolds. Its representation treats each feature not as a single decoder vector but as an activation-weighted distribution over the hidden states expressing it, projects those distributions into a shared reference space, and compares them with Wasserstein distance. The representation is proved invariant to activation rescaling and stable under perturbation, and recovers true matches under finite-sample margin conditions. Empirically it outperformed decoder-vector and LLM-based baselines and captured subtle functional distinctions between related features, and it compressed large feature circuits into interpretable supernodes automatically. The limitation is that this is interpretability tooling: the paper demonstrates better feature matching and circuit compression, not that downstream interpretability claims become more accurate.