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REVIEW 4 major objections 5 minor 54 references

What Really Matters for Table LLMs? A Meta-Evaluation of Model and Data Effects

T0 review · 4 major / 5 minor · reviewed 2026-08-10 · deepseek-v4-flash

Pith's one-line read Base model choice, not training data, dominates table LLM instruction-tuning performance.

desk verdict Solid controlled grid, but the 'base-model dominance' claim is not backed by the paper's own tables. read the letter →

arxiv 2501.14717 v2 pith:XD4UXFVD submitted 2025-01-24 cs.CL

classification cs.CL
keywords tableinstructiontuningbasemodelselectionout-of-domainevaluationquestionansweringLLMmeta-evaluationgeneralization
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This paper isolates two factors that earlier table-LLM work conflates: which base model you start from and which table instruction data you fine-tune on. The authors fine-tune three 7B instruction-tuned models on four public table datasets, producing twelve models, and evaluate them on sixteen table benchmarks plus general reasoning and instruction-following benchmarks. The central finding is that the base model matters more than the training data: switching base models changes out-of-domain performance more than switching training sets. The paper also reports that the untuned base models are already strong table learners, that a training set that works best for one base model is not necessarily best for another, and that fine-tuning for tables does not always compromise general abilities. If this finding holds, practitioners building table LLMs should rank base-model selection above dataset construction.

What carries the argument

The load-bearing mechanism is a crossed design: three 7B instruction-tuned base models (Mistral v0.3, OLMo, and Phi 3 Small) are each fine-tuned on the four public training sets from TableLlama, TableLLM, TableBench, and Table-GPT, forming a 3 × 4 grid of twelve models. Every model is evaluated on sixteen out-of-domain table benchmarks and on general reasoning and instruction-following benchmarks. The grid separates data effects (same base model, different data) from model effects (same data, different base model), and the out-of-domain evaluation prevents comparisons from reducing to memorized training distributions.

What would settle it

Train a known-weak base model on the training set the paper finds best and a known-strong base model on the training set it finds weakest, each with its own separately tuned learning rate and epoch count. If the weak-base/best-data model outperforms the strong-base/weak-data model on the out-of-domain suite, or if a variance decomposition over per-model hyperparameter sweeps shows a larger data component than model component, the claim that base model dominates training data would be undercut.

Watch

Extended reading notes

Core claim

The paper claims that in table instruction tuning, the choice of base model exerts a more dominant effect on downstream performance than the choice of training data. The claim is supported by a controlled grid in which the same three 7B instruction-tuned base models are each fine-tuned on four existing table instruction datasets, so every comparison differs in exactly one factor. Out-of-domain evaluation across table question answering, fact verification, table-to-text generation, and schema reasoning shows that untuned base models frequently match or beat their tuned counterparts, that the best training data differ across base models, and that the base model with the strongest pretrained abilities produces the best tuned models. The paper further shows that table fine-tuning can preserve or even improve scores on general benchmarks such as MMLU, ARC, GPQA, and IFEval for some base models, so specialization and general capability are not strictly opposed.

Load-bearing premise

The analysis rests on the assumption that one shared learning rate (5e-7) and three training epochs give comparably good fits for all twelve model–data combinations, so performance differences are caused by base model and data rather than by uneven tuning quality.

Editorial extensions

If this is right

  • Practitioners should choose the strongest available base model before investing in table-specific training data, because the same data produces very different out-of-domain results across bases.
  • Untuned base models should become routine baselines in table-LLM work, since they already match or exceed tuned 7B models on several benchmarks.
  • Dataset quality rankings are not portable: a training set that is best for one base model can be below-average for another.
  • Strong performance on one benchmark within a task category, such as TabFact for fact verification, does not predict performance on a sibling dataset such as InfoTabs.
  • Table-specific fine-tuning does not necessarily degrade general reasoning or instruction-following ability, so specialization and general utility can coexist.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • The paper uses one shared learning rate and epoch count for all twelve runs; a natural follow-up is to repeat the grid with per-combination hyperparameter search and compare the variance attributed to data versus models.
  • A cheap screening rule follows if the claim transfers: probe candidate base models on a few representative table tasks before fine-tuning any of them, because the untuned ranking largely predicts the tuned ranking.
  • The data-by-model interaction suggests future table instruction datasets should be designed against a target base model rather than assumed to transfer, and the same crossed design could test whether base-model dominance is a general property of instruction tuning in other structured-data domains such as text-to-SQL.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

4 major / 5 minor

Summary. The paper reports a controlled replication of four table instruction-tuned LLMs by fine-tuning three open 7B base models (Mistral v0.3, OLMo, and Phi-3 Small Instruct) on four public training recipes (TableLlama, TableLLM, TableBenchLLM, and Table-GPT), yielding 12 models. These models are evaluated on 16 table benchmarks spanning table QA, table fact verification, table-to-text generation, schema reasoning, and a miscellaneous task, plus five general benchmarks (MMLU, MMLUPro, AI2ARC, GPQA, IFEval). The headline finding is that base model choice plays a more dominant role than training data for out-of-domain table performance; secondary findings include strong untuned baselines, data effects that depend on the base model, transferability across table tasks, and limited degradation of general capabilities after table instruction tuning.

Significance. The controlled 3x4 grid is a genuine contribution: it is the first apples-to-apples replication of four existing table LLMs and provides reusable results, including a new SOTA on HiTab with only 5% of TableLlama's training data. If the dominance claim held, it would give practitioners actionable guidance to prioritize base-model selection over dataset choice. The paper also offers falsifiable observations, such as TableLLM's training data improving table QA and the untuned base models being competitive. However, the headline quantitative claim is not actually quantified, and several supporting statements are contradicted by the paper's own tables; these issues must be resolved before the paper can be accepted.

major comments (4)
  1. [Abstract; §5.3; Table 10] The central claim that base model choice plays a 'more dominant role' than training data is never quantified. Table 10 reports 16 benchmarks in heterogeneous metrics, and direct inspection shows large effects on both axes: for example, on WikiTQ, varying the training data for Mistral moves accuracy from 23.8 to 37.4, while varying the base model on TableLLM data moves it from 26.7 to 37.7; on TabFact, varying the training data for Mistral moves accuracy from 11.9 to 86.8. 'Dominant' requires a per-benchmark standardized effect-size analysis, such as a variance partition, ANOVA on ranks, or a regression with base model, training data, and interaction terms, together with a statement of uncertainty. The current tables provide neither, so the abstract's claim of 'quantitatively disentangl[ing]' overstates the evidence.
  2. [§3 Experimental Setups] The hyperparameter choice is a potential confound for the main comparison. The paper states that models were trained with learning rate 5e-7 for three epochs after a sweep over eight rates, but it does not say whether the sweep was performed separately for each of the 12 base-model/data combinations or only once. If 5e-7 is optimal for only some cells, the measured differences between base models and between datasets are partly tuning-quality differences, not pure base/data effects. Please add per-cell validation curves or an explicit sensitivity analysis (for example, re-running at neighboring learning rates on a subset of cells) to show that the conclusion is robust.
  3. [§5.2; Table 7 and Table 10] The claim that TableLLM's training data 'consistently achieves the best ... on table QA tasks across all three base models' is not supported by the displayed results. In Table 7, on HiTab the best Mistral-based model is TableLlama (70.6), not TableLLM (44.1), and TableLlama's training data includes HiTab (gray cell), so this is an in-domain comparison rather than an out-of-domain one. In Table 10, the best WikiTQ result for Mistral is TableBench (37.4), not TableLLM (32.3), and the best TabFact result for OLMo is TableLlama (83.8), with TableLLM data at 40.6. Please either revise the claim to name the specific datasets where it holds and exclude overlapping gray cells, or present a formal aggregation that supports the stated conclusion.
  4. [§5; Table 10 note] The out-of-domain analysis includes gray cells whose training data overlaps with the evaluation benchmark, and these cells appear to contribute to the 'most number of top performance' markers used in the analysis. Because the paper's main claims are about generalization to unseen tasks, overlapping cells should be removed from the comparison or analyzed separately; otherwise the out-of-domain finding is partly circular. Please report the counts with and without gray cells and make clear which of the paper's claims each analysis supports.
minor comments (5)
  1. [Abstract] The abstract writes 'Hitab' where the rest of the paper uses 'HiTab'; please correct the spelling.
  2. [Table 7 caption] The caption says 'Out-of-domain evaluation' but the same table marks train-data overlap in gray; please clarify in the caption how gray cells should be interpreted relative to the out-of-domain framing.
  3. [§4.1] The phrase 'we rule out the table operation datasets and only maintain the training data' is awkward; 'we exclude the table operation datasets and keep only the training data' would be clearer.
  4. [§6.2] The suggestion that the AI2ARC improvement is 'likely due to' table tasks involving reasoning is not tested by any analysis; please soften the causal language or provide supporting evidence.
  5. [Appendix B] For the multiple-choice benchmarks, the paper selects the completion with highest likelihood without length normalization; this is a defensible choice, but a sentence of justification or a citation would help readers interpret the results.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the paper's findings are direct empirical observations from a fully crossed training grid, not a derived quantity that reduces to its inputs.

full rationale

This paper is an empirical meta-evaluation rather than a derivation, so the usual circularity mechanisms are absent. The central claim that base model choice plays a more dominant role than training data comes from a controlled 3x4 design: three base models are each fine-tuned on four public training datasets and then scored on external benchmarks. No fitted parameter is later relabeled as a prediction; the reported numbers are raw evaluation results, and the paper does not define any quantity in terms of another and then present that identity as a finding. The only self-citation, Deng et al. (2024), is used to justify focusing on text rather than image table representations; this is a scope decision and is not load-bearing for the data-versus-model conclusion, which depends on the benchmark comparisons themselves. The limitation statements in the paper concede only that not all datasets could be covered, not that any result is assumed. The gray-shaded in-domain cells in the out-of-domain tables are disclosed in the captions, so the overlap is visible to the reader rather than concealed; even if those cells inflate some per-dataset observations, the paper's core comparison across base models and training data remains an empirical report, not a construction. The single learning rate and epoch count across all cells is a potential confound in the strength of the headline claim, but a confound is not circularity. No step in the paper's reasoning reduces to its own input, so a score of 0 is appropriate.

Assumptions & free parameters 2 free parameters · 4 assumptions · 0 invented entities

The paper introduces no new entities or fitted scientific constants. Its free parameters are standard fine-tuning hyperparameters. The main assumptions are about representativeness of the model and dataset sample, parity of training conditions, and validity of the evaluation pipeline, including the Haiku extraction step.

free parameters (2)
  • learning rate = 5e-7
    Selected from eight candidate values as the empirically best across all models; applied uniformly, so differences in optimal learning rate per base model or dataset are not controlled.
  • number of epochs = 3
    Applied uniformly to all 12 models, chosen for consistency rather than per-task convergence, and this choice could affect the comparison.
assumptions (4)
  • domain assumption The three base models (Mistral v0.3 7B Instruct, OLMo 7B Instruct, Phi 3 Small Instruct) and four training datasets are representative of the table instruction-tuning landscape.
    Section 3 introduces these as the foundation families; conclusions about base models generally depend on this selection.
  • domain assumption Training each model for three epochs with learning rate 5e-7 yields comparably near-optimal fits across all base model and dataset combinations.
    Section 3 'Experimental Setups' states that 5e-7 was best and that three epochs were used for consistency; unequal optimality would confound comparisons.
  • domain assumption Using Haiku 3.5 to extract answer entities from free-form generations does not systematically favor any base model.
    Appendix A describes this extraction for table QA metrics; bias in extraction would distort benchmark scores.
  • domain assumption The selected evaluation benchmarks are valid proxies for table understanding and general reasoning abilities.
    Sections 5.1 and 6.1 select benchmarks as proxies for table QA, fact verification, table-to-text, and general reasoning.

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Cite this review

Pith. "Pith review of What Really Matters for Table LLMs? A Meta-Evaluation of Model and Data Effects." pith.science (2026). https://pith.science/paper/XD4UXFVD

@misc{pith2026250114717,
  author       = {Pith},
  title        = {Pith review of: What Really Matters for Table LLMs? A Meta-Evaluation of Model and Data Effects},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/XD4UXFVD}},
  note         = {Machine review of arXiv:2501.14717}
}
read the original abstract

Table modeling has progressed for decades. In this work, we revisit this trajectory and highlight emerging challenges in the LLM era, particularly the paradox of choice: the difficulty of attributing performance gains amid diverse base models and training sets in the context of table instruction tuning. We replicate four table LLMs by instruction-tuning three foundation models on four existing datasets, yielding 12 models. We then evaluate these models across 16 table benchmarks. Our study is the first to quantitatively disentangle the effects of training data and base model selection, revealing that base model choice plays a more dominant role than the training data itself. Generalization and reasoning remain challenging, inviting future effort on table modeling. Based on our findings, we share our thoughts on the future directions for table modeling.

Figures

Figures reproduced from arXiv: 2501.14717 by the authors.

Figure 1
Figure 1. Performance of fine-tuned models trained on different data (e.g. TableLlama) on general benchmarks. [PITH_FULL_IMAGE:figures/full_fig_p008_1.png] view at source ↗
Figure 2
Figure 2. Performance of Phi 3 Mini Instruct (4B) versus Phi 3 Small Instruct (7B) model on different table tasks [PITH_FULL_IMAGE:figures/full_fig_p016_2.png] view at source ↗
Figure 3
Figure 3. Performance of Phi 3 Mini Instruct (4B) versus Phi 3 Small Instruct (7B) model on different table tasks [PITH_FULL_IMAGE:figures/full_fig_p017_3.png] view at source ↗
Figures from the paper (1 more)
Figure 4
Figure 4. Figure 4: Performance difference between Phi 3 Mini Instruct (4B) versus Phi 3 Small Instruct (7B) model. On [PITH_FULL_IMAGE:figures/full_fig_p018_4.png]

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Pith tools

Reviewed August 10, 2026 · model on record in the stance chip above.