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ElTab trains one tabular transformer across many compute budgets, matching six depth-specific models at more than half the training cost

AspireAI community · arXiv (cs.LG)
Tabular transformers such as TabPFN predict well but cost a lot at inference, and looped transformers cut parameters through weight sharing yet lose predictive power when stopped early. ElTab is a single model trained to operate across different computational budgets, using supervision at randomly sampled early exits. Across 30 OpenML classification datasets, one ElTab model matches six depth-specific looped models while cutting training cost by more than half, and matches a 12-layer TabPFN-style baseline with 25 percent fewer inference FLOPs. The trade is a model that adapts to the deployment budget at hand rather than one tuned for a single depth. The evaluation is on OpenML classification, so the result speaks to tabular prediction rather than to language or multimodal workloads.
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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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