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arXiv 2602.04031cs.LG
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表格语言模型中的泛化错觉

The Illusion of Generalization in Tabular Language Models

University of California, Los Angeles, USA(加州大学洛杉矶分校);IT University of Copenhagen, Denmark(哥本哈根IT大学)

Aditya Gorla, Ratish Puduppully

AI总结:

通过系统评估Tabula-8B在165个数据集上的表现,发现其声称的泛化能力主要源于评估伪影(如数据污染和格式熟悉度),而非真正的表格推理。

摘要:

表格语言模型(TLMs)据称在表格预测中实现了强大的泛化能力。我们对代表性TLM——Tabula-8B进行了系统性的重新评估,使用了UniPredict基准中的165个数据集。我们的研究揭示了三个发现。首先,二分类和多类别分类在多数类基线上实现了接近零的中位数提升,而强大的聚合性能完全由四分位数分类任务驱动。其次,表现最好的数据集存在普遍的数据污染,包括完整的训练-测试重叠和任务级泄露,这些污染规避了标准的去重方法。第三,在没有表格数据暴露的情况下进行指令微调,恢复了标准分类性能的92.2%,而在四分位数分类上,格式熟悉度缩小了71.3%的差距,剩余部分归因于污染数据集。这些发现表明,声称的泛化能力可能反映的是评估伪影,而非学到的表格推理。最后,我们提出了加强TLM评估的建议。

英文摘要:

Tabular Language Models (TLMs) have been claimed to achieve strong generalization for tabular prediction. We conduct a systematic re-evaluation of Tabula-8B as a representative TLM, utilizing 165 datasets from the UniPredict benchmark. Our investigation reveals three findings. First, binary and categorical classification achieve near-zero median lift over majority-class baselines and strong aggregate performance is driven entirely by quartile classification tasks. Second, top-performing datasets exhibit pervasive contamination, including complete train-test overlap and task-level leakage that evades standard deduplication. Third, instruction-tuning without tabular exposure recovers 92.2% of standard classification performance and on quartile classification, format familiarity closes 71.3% of the gap with the residual attributable to contaminated datasets. These findings suggest claimed generalization likely reflects evaluation artifacts rather than learned tabular reasoning. We conclude with recommendations for strengthening TLM evaluation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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