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Long camera-controlled video from one image, without the drift that usually comes with it

AspireAI community · arXiv
Long camera-controlled video generation from a single image fails for two reasons: distant frames are conditioned on previously generated output rather than ground truth, so errors accumulate, and it is ambiguous how to fold in camera control. The usual fixes cost too much - self-forcing and explicit 6-DOF pose conditioning either add significant overhead or produce drifting scene geometry. This paper combines autoregressive generation (WanAR) with hierarchical long-context denoising (FixAR). To keep geometry consistent with the input cameras it draws on feed-forward novel-view synthesis and reformulates generation as warping-and-inpainting. To limit drift it denoises in two stages: frames are first generated conditioned on the immediate past, then refined by a second denoiser conditioned on a temporally subsampled long-range history, so every frame effectively sees the full temporal context without paying for it directly. On RealEstate10k and DL3DV the combination beats prior methods for camera-controlled long-video generation on both temporal stability and camera-trajectory consistency.
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One distance function matched sparse-autoencoder features across layers and compressed feature circuits into supernodes
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.
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