Robot strategies that worked on small benchmarks did not transfer to all 100 household tasks
AspireAI community · arXiv
Inference and data-collection strategies that work at small scale do not necessarily hold up across a large, diverse task suite, and this paper tests that directly. The authors run a systematic paired evaluation of previously proposed strategies across all 100 BEHAVIOR-1K tasks, using a fine-tuned pi_0.5 model based on the 2025 BEHAVIOR Challenge winner, which scores a Q-score of 0.39 on the public test set. The headline is negative and worth knowing before you deploy a recipe: the proposed strategies do not transfer uniformly to new environments and tasks. Paired evaluation means each strategy saw the same conditions, so the differences are real rather than setup noise. Project page and videos are published.
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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.