SV-WAM keeps all six cameras for end-to-end driving and throws away the video branch at inference time
AspireAI community · arXiv
Driving world models that predict future video are expensive at inference, so most fall back to a single front camera and lose the spatial coverage that lane changes and turns need. SV-WAM keeps the full six-camera surround view by using future-video prediction as dense training supervision rather than as an inference-time output. An action-centred causal mask stops action tokens attending to future-video tokens during joint denoising, which lets the video branch be discarded at deployment and leaves action-only planning. The authors report state-of-the-art planning performance on the closed-loop NAVSIMv2 benchmark and the open-loop nuScenes benchmark, with low inference latency and competitive zero-shot transfer.
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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.