REVIEW 2 major objections 6 minor 2 cited by
Lost in Inference: Rediscovering the Role of Natural Language Inference for Large Language Models
T0 review · 2 major / 6 minor · reviewed 2026-08-12 · deepseek-v4-flash
Pith's one-line read NLI benchmarks still separate strong from weak LLMs, and model–human agreement on ambiguous cases improves as models scale.
desk verdict The JSD scale effect is the paper's real news, but the underspecified model distribution behind it makes that finding the one to verify before betting on it. read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The central object is the Jensen-Shannon divergence (JSD) between a model's softmax distribution over NLI labels and the human label distribution recorded in ChaosNLI, a benchmark supplying 100 human annotations per example for subsets of MNLI, SNLI, and αNLI. JSD is a symmetric, bounded (0 to 1) distance between two probability distributions, chosen because, unlike KL divergence, it treats the two distributions symmetrically. The paper also relies on a choice-based evaluation protocol (computing negative log-likelihood over letter options) and on the monotonicity statistic (Kendall tau against an idealized increasing curve) to judge whether a benchmark can track training progress.
What would settle it
If a larger model evaluated on ChaosNLI subsets showed a JSD no lower than a smaller model's, or if JSD rose during later training while accuracy kept improving, the claim that JSD is a scale-sensitive evaluation signal would be falsified. A complementary check would be to pre-train an 8B and a 70B model on a standard public data mixture beyond 2 trillion tokens to see whether NLI accuracy still rises late in training.
Extended reading notes
Core claim
NLI tasks still provide a discriminating, non-saturated, and contamination-free signal for evaluating LLMs. Concretely, on ANLI, even the largest models remain below 70% accuracy, and across MNLI, SNLI, and HANS, accuracy gaps between 8B, 70B, and 405B models are substantial, while αNLI saturates early. A second discovery is distributional: when a model's softmax probabilities over entailment, neutral, and contradiction are compared with the full human label distribution (100 annotations per example from ChaosNLI), the Jensen-Shannon divergence is far lower than chance or earlier BERT-scale models, and — contrary to earlier findings — it decreases steadily both with model scale and over the course of pre-training. The paper interprets this as evidence that NLI benchmarks remain informative for model development and that the JSD between model and human labels is a promising, scale-sensitive evaluation statistic.
Load-bearing premise
The training-dynamics and JSD-vs-scale conclusions rest on a single from-scratch pre-training run for each of two model sizes, stopped at 2 trillion tokens using a custom, unreleased data mixture; if that run is not representative of typical pre-training, the curves in Figures 2 and 5 may not generalize.
Editorial extensions
If this is right
- NLI benchmarks still separate models of different size and quality: on ANLI the best models stay below 70% accuracy, while MNLI and SNLI show clear gaps across the Llama and Mistral families.
- Performance on these benchmarks develops during pre-training, so they can track long-horizon training progress, with the caveat that their monotonicity at 8B scale is low.
- Contamination does not inflate the scores: 8-gram overlap analysis shows virtually no estimated performance gain from contaminated examples.
- On ambiguous examples, model disagreement with the human majority label is largest when human entropy is high, and models align more with the majority label as they scale.
- The JSD between model softmax distributions and human label distributions decreases with both scale and training time, yet stays far above human–human JSD, so there is headroom for improvement.
Reading between the lines
- An implication the authors leave implicit: if JSD to human labels keeps falling with scale, it could become a training-time monitoring signal or even a target, nudging models toward calibrated uncertainty rather than majority-label accuracy.
- The authors note the jury idea in passing; a consequence they do not spell out is that a panel of LLM judges may share systematic biases, so jury–human agreement should be checked against human label distributions before using panels for evaluation.
- Because the training dynamics rest on one custom datamix, a natural test is to re-run the 8B and 70B curves on a standard public mix; the paper's monotonicity table suggests NLI accuracy may not be reliable for checkpoint selection at small scales regardless.
- A testable extension: if JSD is a genuine quality signal, models fine-tuned or post-trained to minimize JSD on ChaosNLI should also become better at selective prediction and calibration under distribution shift.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper asks whether NLI benchmarks remain informative for evaluating large language models. It evaluates five NLI benchmarks (SNLI, MNLI, HANS, ANLI, αNLI) on six base models (Llama-3.1 8B/70B/405B and Mistral 7B, Mixtral 8x7B/8x22B) using a multiple-choice NLL scoring setup. The reported results are that accuracy discriminates model scale, few-shot examples are needed for reasonable performance, accuracy develops during pre-training (with low monotonicity for the 8B model), contamination does not meaningfully inflate scores, and errors on the strongest model often coincide with human disagreement. Using ChaosNLI, the paper compares model probability distributions with human label distributions via Jensen-Shannon divergence (JSD), reporting that JSD decreases with scale and during training, although model-human JSD remains substantially above human-human JSD. The central recommendation is that NLI benchmarks, and especially distributional agreement with human labels, remain useful signals for LLM evaluation.
Significance. If the JSD finding is robust, it provides a potentially practical training-monitoring statistic and a way to quantify alignment with human label variation, directly extending the earlier ChaosNLI result that model-human JSD did not improve with scale. The discriminability, few-shot, and contamination analyses are useful and would help practitioners decide whether to include NLI benchmarks in evaluation suites. The paper makes good use of public benchmarks and an established contamination methodology, and the manual error analysis connects accuracy saturation to genuine label ambiguity rather than model deficiency. However, the headline JSD claim currently depends on an unspecified and unvalidated proxy for model label distributions, and the training-dynamics claims rest on single from-scratch runs with a custom unreleased datamix. These issues need to be resolved before the central conclusions can be taken at face value.
major comments (2)
- [§4.5, with §3.3 and Table 5] The stress-test concern about the JSD computation lands. Section 4.5 reports Jensen-Shannon divergences between model softmax distributions and human label distributions, but the paper never states how the model distribution over labels is obtained. The evaluation in §3.3 computes only the negative log-likelihood of the option letter ('A'/'B'/'C'), so the natural reading is that JSD is computed from a softmax over these letter NLLs. This proxy is not validated: it ignores probability mass of the full answer string, is sensitive to tokenization of single letters, and is vulnerable to position and letter priors. Because the prompt template in Table 5 always orders the options as A. Entailment, B. Neutral, C. Contradiction, any systematic letter preference can inflate or deflate JSD in a way that correlates with scale. The paper reports no checks with permuted option orders or with full-label scoring. Please specify the exact distribution used and add such checks; without them, the headline scale and training effects in Figures 4b and 5 could be artifacts of the proxy rather than evidence about human-aligned distributions.
- [§4.2, Figure 5, Appendix D] The training-dynamics and JSD-during-training claims rest on a single from-scratch pre-training run each for the 8B and 70B models, stopped at 2T tokens with the authors explicitly noting that they did not have the budget for a full run. Appendix D describes the data only as a custom mix of public web, code, and reasoning data, without sufficient detail for replication. One run per scale provides no estimate of run-to-run variance, and the unreleased datamix makes it impossible for others to assess how representative the curves are. Please either add multiple runs or seeds, use checkpoints from a released model series that span training, or clearly reframe these sections as a single-configuration case study and soften the general conclusion that JSD decreases steadily during training.
minor comments (6)
- [Conclusion] The sentence listing the benchmarks says 'five different NLI benchmarks – αNLI, ANLI, HANS, and MNLI', omitting SNLI; the list should include all five.
- [§4.5] The text refers to 'the three possible labels Entailment, Neutral, and Contradiction', but αNLI is a two-choice task and the ChaosNLI αNLI subset presumably has two labels; clarify how the JSD is computed for the binary tasks.
- [Figure 1 and footnote 3] The x-axis labeled 'shots' should be made explicit as 'number of few-shot examples', and the number of examples used for each shot setting should be stated in the caption or main text rather than only in a footnote.
- [§4.4] The manual error analysis covers 40 predictions from a single model (Llama-3.1 405B) on MNLI only; the generalization that 'most of the mistakes in MNLI' are human-disagreement cases should be hedged accordingly.
- [§4.3] The phrase 'contamination does not play a participatory role' is unclear; use 'does not play a significant role' or similar, and fix the typo 'indicitive'.
- [§2.1] The sentence 'the benchmarks MNLI and RTE and RTE were used' appears to have a duplicated phrase; remove the repetition.
Circularity Check
No circularity: the headline results are direct measurements on public benchmarks, and the few self-citations supply measurement tools rather than load-bearing conclusions.
full rationale
The headline results are direct measurements on fixed public benchmarks. Accuracy, NLL, and JSD are computed by scoring models against SNLI, MNLI, HANS, ANLI, alphaNLI, and ChaosNLI labels; no parameter is fitted to the target conclusions, and no quantity is defined in terms of the outcome it is used to establish. The self-citations in Section 4.2 (Madaan et al. 2024 for the Kendall-tau monotonicity definition) and Section 4.3 (Singh et al. 2024 for the ConTAM contamination methodology) supply measurement definitions and tools rather than load-bearing empirical premises; the contamination analysis is performed on independently trained from-scratch models, and the monotonicity statistic is a standard rank correlation. The JSD comparison in Section 4.5 uses model softmax scores and human label distributions from ChaosNLI; the softmax-over-letters operationalization may be a validity concern (for example, letter-position bias could confound scale effects), but that is a measurement-robustness issue, not a circular reduction. The from-scratch training runs are incomplete and use a custom datamix, but that is a data limitation rather than an instance of the target result being assumed. I therefore find no circular step.
Assumptions & free parameters
assumptions (5)
- domain assumption Entailment and contradiction are central to language meaning, making NLI a valid test of language understanding.
- domain assumption Choice-based NLL over answer letters is a valid proxy for the model's label distribution.
- domain assumption The 8-gram overlap contamination score and ConTAM thresholds provide a valid contamination estimate.
- domain assumption The human-human JSD reported by Nie et al. (2020b) is a valid baseline for human disagreement.
- domain assumption A single from-scratch 2T-token pre-training run per scale represents typical training dynamics.
Cite this review
Pith. "Pith review of Lost in Inference: Rediscovering the Role of Natural Language Inference for Large Language Models." pith.science (2026). https://pith.science/paper/F6F3YNDU
@misc{pith2026241114103,
author = {Pith},
title = {Pith review of: Lost in Inference: Rediscovering the Role of Natural Language Inference for Large Language Models},
year = {2026},
howpublished = {\url{https://pith.science/paper/F6F3YNDU}},
note = {Machine review of arXiv:2411.14103}
}
read the original abstract
In the recent past, a popular way of evaluating natural language understanding (NLU), was to consider a model's ability to perform natural language inference (NLI) tasks. In this paper, we investigate if NLI tasks, that are rarely used for LLM evaluation, can still be informative for evaluating LLMs. Focusing on five different NLI benchmarks across six models of different scales, we investigate if they are able to discriminate models of different size and quality and how their accuracies develop during training. Furthermore, we investigate the extent to which the softmax distributions of models align with human distributions in cases where statements are ambiguous or vague. Overall, our results paint a positive picture for the NLI tasks: we find that they are able to discriminate well between models at various stages of training, yet are not (all) saturated. Furthermore, we find that while the similarity of model distributions with human label distributions increases with scale, it is still much higher than the similarity between two populations of humans, making it a potentially interesting statistic to consider.
Figures
Figures from the paper (3 more)
Forward citations
Cited by 2 Pith papers
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Math Natural Language Inference: this should be easy!
A new Math NLI corpus from category theory abstracts plus a ten-model evaluation shows LLM unanimous votes approach human labels (88%) but individual LLMs still make basic math reasoning errors.
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A Rose by Any Other Name: LLM-Generated Explanations Are Good Proxies for Human Explanations to Collect Label Distributions on NLI
LLM-generated explanations, paired with a few human labels, produce model judgment distributions as close to human judgment distributions as human explanations do on NLI.
Reference graph
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Reviewed August 12, 2026 · model on record in the stance chip above.
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