arXiv Machine Learning By Tianqi Zhao, Jia Guo, Yan Shuo Tan, Qiong Zhang

TabReliBench: Evaluating Tabular Foundation Models Beyond Predictive Accuracy

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TabReliBench evaluates tabular foundation models (TFMs) on reliability metrics beyond predictive accuracy, including point prediction, distributional quality, marginal and subgroup calibration, and interval efficiency. The benchmark reveals that TFMs’ performance rankings differ from those in TabArena and vary across reliability measures. While regression TFMs often achieve near‑nominal marginal coverage with narrow intervals, this does not guarantee valid conditional coverage, and ensembling or conformal post‑processing does not consistently improve calibration. The study underscores the need for multidimensional evaluation when selecting reliable TFMs.

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