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REVIEW 4 major objections 6 minor 59 references

Refine Knowledge of Large Language Models via Adaptive Contrastive Learning

T0 review · 4 major / 6 minor · reviewed 2026-08-08 · deepseek-v4-flash

Pith's one-line read A training strategy that sorts an LLM's knowledge into known, uncertain, and unknown reduces hallucination by teaching each region differently.

desk verdict Adaptive quadrant-aware contrastive SFT is a plausible and well-ablated method, but the reported Truthful Rate gains are not trustworthy until the known/unknown labels used for evaluation are independent of the model's own sampling. read the letter →

arxiv 2502.07184 v1 pith:5RAPN2L4 submitted 2025-02-11 cs.CL cs.AI

classification cs.CLcs.AI
keywords hallucinationmitigationknowledgeboundariescontrastivelearninginstructiontuningtruthfulratelargelanguagemodelsIdon'tknowrefusalquadrants
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

Large language models hallucinate when they answer questions beyond their knowledge. This paper argues that the remedy is to help the model act on an accurate picture of what it knows: consolidate correct knowledge, strengthen half-learned knowledge, forget wrong knowledge, and answer "I don't know" when knowledge is absent. To do this it proposes Adaptive Contrastive Learning, which first sorts questions into known, uncertain, and unknown using the model's own repeated-sampling accuracy against two thresholds, $IK$ and $IDK$, and then builds different positive and negative training pairs for each sort. The reported effect is a Truthful Rate—correct answers plus correct refusals—of up to 78.2% versus 73.2% for supervised fine-tuning on TriviaQA with LLaMA-2-7B-chat, and up to 6.9 points over IDK-SFT on the out-of-distribution Natural Questions set.

What carries the argument

The central object is a two-threshold knowledge partition ($IK$, $IDK$) computed from the model's repeated-sampling accuracy, which splits questions into three regions: accuracy $\ge IK$ means the model knows it knows, accuracy between $IDK$ and $IK$ means the model is uncertain, and accuracy $\le IDK$ means the model does not know. On each region the paper builds contrastive instruction triplets (anchor, positive, negative) with quadrant-specific semantics, then optimizes an adaptive loss $L^{Adap} = L^{gen} + \max(\lambda, \text{detach}(L^{gen}/L^{ctr})) L^{ctr}$, where $L^{gen}$ is standard cross-entropy generation loss and $L^{ctr}$ is a cosine-similarity contrastive loss that pulls positive hidden states together and pushes negative hidden states apart.

What would settle it

Build a test set of questions where the base model repeatedly answers correctly with a confident but factually wrong answer (accuracy comfortably above $IK$), then train with IDK-SFT-Adpt-Ctr and check whether it still emits those wrong answers on a gold-labeled test. If Truthful Rate stays high while factual accuracy on those questions does not improve, the method is learning to lock in its own confidence pattern rather than refining knowledge.

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Extended reading notes

Core claim

On the paper's own terms, the discovery is that a single fine-tuning strategy can simultaneously improve both sides of honesty—giving correct answers when the model knows and refusing when it does not—by adapting contrastive learning to the model's current mastery. The authors construct knowledge quadrants from repeated-sampling accuracy with thresholds $IK$ and $IDK$, and show that treating each quadrant with a purpose-built contrastive loss raises Truthful Rate consistently across two base models and out-of-distribution datasets. For known questions, the correct answer is pulled toward the anchor while "I don't know" and wrong answers are pushed away; for uncertain questions, the golden answer is pulled in and wrong answers are pushed away; for unknown questions, "I don't know" is pulled in and wrong answers are pushed away. They also report that the full multi-quadrant loss beats any single-quadrant or pair combination, and that the method remains effective when combined with retrieval-augmented generation and when scaled to a 13B model.

Load-bearing premise

The load-bearing premise is that a question's knowledge status—known, uncertain, or unknown—is faithfully measured by how often the model itself answers it correctly across repeated samples; if that self-accuracy proxy is wrong, the positive and negative training pairs encode the model's own confidence rather than true knowledge.

Editorial extensions

If this is right

  • On TriviaQA with LLaMA-2-7B-chat, the method lifts Truthful Rate from 73.2% with IDK-SFT to 78.2%, with the IK-IK rate (correct answers on known questions) rising 9.3 points even as correct refusals remain close to the SFT level.
  • On out-of-distribution Natural Questions, Truthful Rate rises 6.1 points over IDK-Prompting and 6.9 points over IDK-SFT for LLaMA, and 15.9 and 6.8 points for Mistral, indicating the learned answer-or-refuse boundary transfers beyond the training data.
  • Loss ablations show that consolidating uncertain knowledge contributes the most to correct answering, the known-knowledge loss makes the model more conservative, and the unknown-knowledge loss encourages forgetting wrong answers; only the full combination reaches the maximum Truthful Rate.
  • Combining with retrieval-augmented generation does not break the method: on RAG-Bench, retrieved context raises the method's Truthful Rate from 66.9% to 71.2%, while shifting some refusals into answers as expected.
  • Scaling from 7B to 13B parameters improves all metrics slightly for every method, and the proposed method keeps its advantage, suggesting the strategy composes with model scale.

Reading between the lines

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

  • If the model's repeated-sampling accuracy is an imperfect mirror of true knowledge—for example, if a model confidently repeats a plausible falsehood—then the training targets inherit that error, so part of the reported gain may be the model learning to reproduce its own confidence pattern rather than correcting facts; a direct test would measure factual precision on a set of consistently-wrong-but
  • Because Truthful Rate counts correct answers and correct refusals as interchangeable, a model that over-refuses can score well on unknown-heavy test sets; the choice of $IK$ and $IDK$ thresholds therefore does real work in the metric, not just in the training loss.
  • The adaptive loss weight $\max(\lambda, \text{detach}(L^{gen}/L^{ctr}))$ implicitly up-weights the contrastive term when it is small relative to the generation loss, acting as a stabilizer against the contrastive signal vanishing—a ratio design that could transfer to other contrastive fine-tuning objectives.
  • Applying the same quadrant construction with an external knowledge oracle (such as retrieval or a trusted fact base) instead of self-sampling would separate "knowing" from "thinking it knows," which is a natural next experiment to isolate where the gains actually come from.
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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 / 6 minor

Summary. The paper proposes Adaptive Contrastive Learning (IDK-SFT-Adpt-Ctr) to improve the honesty of LLMs by refining their knowledge boundaries. The method defines upper and lower accuracy thresholds (IK and IDK) from repeated sampling of the base model, classifies questions into known, uncertain, and unknown regions, and constructs quadrant-specific positive and negative instances for contrastive instruction tuning. An adaptive loss, Eq. (3), combines generation loss with a contrastive loss whose weight is max(lambda, detach(L_gen/L_ctr)). Experiments on TriviaQA and Natural Questions with LLaMA-2-7B-chat and Mistral-7B-Instruct-v0.1 report Truthful Rate improvements over IDK-Prompting and IDK-SFT, with additional ablations on loss components, IDK threshold values, model size, ALCUNA, and RAG integration.

Significance. If the reported gains are real, the method would be a practical contribution to selective answering and hallucination mitigation, and the quadrant-specific contrastive data construction is a plausible mechanism. The paper has useful strengths: it evaluates on two base models, includes a loss-combination ablation (Table 3), a threshold analysis (Table 2), and an independent ALCUNA experiment (Table 4). However, the evaluation is built on labels derived from the same base-model repeated-sampling procedure used to construct training data, and the reported Truthful Rate may largely measure how well the model reproduces the base model's own confidence pattern. The absence of error bars, the absence of strong baselines, and the very small independent gain on ALCUNA mean the central claim is not yet established.

major comments (4)
  1. [Section 3.1 and Appendix B.1] The test-set known/unknown labels are never specified. Section 3.1 describes generating labels only for training via repeated sampling of the base LLM and thresholding by IK/IDK, while Appendix B.1 defines IK-IK and IK-IDK rates relative to questions "labeled as model knows" or "model-don't-know" in the test set. If the same self-derived labels are used for the 11,313 TriviaQA and 3,610 Natural Questions test instances, then a model that learns to answer exactly where the base model sampled correctly and to refuse exactly where it sampled incorrectly will attain a high Truthful Rate regardless of whether those labels reflect true knowledge. The authors must state how test labels were obtained, and should re-evaluate on externally labeled data (human annotation, ALCUNA-style artificial unknowns, or labels from a different model) to support the hallucination-reduction claim.
  2. [Table 2 and Section 4.4] The IDK threshold is selected on the test set without a validation protocol, and no error bars or significance tests are reported. Table 2 shows IDK=0.7 maximizing Truthful Rate on the test set, which makes the headline numbers optimistic. In Table 1, the Mistral TriviaQA gain of IDK-SFT-Adpt-Ctr over IDK-SFT is 1.3 points (73.5 vs. 72.2); with 11,313 test questions, this difference may be within sampling noise. Multi-seed runs or bootstrap confidence intervals are needed before the 5.0-6.9 point claims can be taken at face value.
  3. [Eq. (3) and Section 5.2] The contribution of the "adaptive" weighting mechanism itself is not ablated. Table 3 ablates the quadrant-specific loss components, but every configuration uses the same max(lambda, detach(L_gen/L_ctr)) weighting; a fixed-weight contrastive loss, or a variant with lambda only, is needed to determine whether the adaptive term causes the improvement or whether the improvement comes from the combination of quadrant-specific contrastive data alone. Without this control, the central causal claim that the adaptive loss drives the gains is unsupported.
  4. [Section 4.4 and Appendix C.1] The comparison set is too narrow. The baselines are only IDK-Prompting and IDK-SFT, both constructed by the authors; established methods for "I don't know" calibration, such as R-tuning (cited as Zhang et al. 2024c), and standard factuality benchmarks (e.g., TruthfulQA) are absent. The only independent evaluation, ALCUNA in Table 4, shows a 0.5 point Truthful Rate gain over IDK-SFT (98.3 vs. 97.8) on questions that are unknown by construction, and no significance test is given. This is a weak basis for the paper's strong conclusions about reducing hallucinations.
minor comments (6)
  1. [Eq. (3) and Eq. (6)] The text says lambda is the "upper bound of the weight," but max(lambda, detach(L_gen/L_ctr)) actually makes lambda a lower bound on the contrastive weight; the terminology should be corrected.
  2. [Section 4.1.2] The sentence "We select LLaMA-2-7B-chat and Mistral-7B-Instruct-v0.1 as base models for testing on TriviaQA and Natural Questions, respectively" is ambiguous, since Table 1 reports both models on both datasets; clarify which model is evaluated on which dataset.
  3. [Section 5.3 and Figure 4] Figure 4 contains four panels whose labels are inconsistent ("Unknown Question" vs. "UnknownQuestions", "Known Question" vs. "KnownQuestions"); clarify how the repeated-sampling accuracy categories are computed and why there are two versions of each plot.
  4. [Table 2] The column header "Knowing Rate" is unclear; it should be "IDK Rate" or "I Don't Know Rate" to match the description in the text.
  5. [Appendix B.1] The definition of IK-IK rate contains a typo: "We calculate the number of correct answers given by the model as a percentage of the total number of questions in the dataset as a fraction of the IK-IDK rate" should read "as the IK-IK rate."
  6. [General] No code or data release link is provided, which hinders reproducibility of the data construction and training pipeline; please include the implementation details or a public repository.

Circularity Check

1 steps flagged · score 6.0 of 10

Truthful Rate improvements are measured against the same base-model repeated-sampling labels used to construct training data, making the central claim partly definitional.

  1. self definitional [Section 3.1 (knowledge boundaries); Section 5.3 (repeated sampling distribution); Appendix B.1 (evaluation metrics)]
    "Following previous studies Cheng et al. (2024); Zhang et al. (2024c), we filter questions from public datasets and query LLMs multiple times to sample responses, calculating accuracy as a measure of the model's confidence in each question. ... Confidence below IDK indicates a lack of knowledge. ... we conduct ten repeated samplings of questions from the TriviaQA test set on LLaMA-2-7B-chat, categorizing them into 'Unknown Questions' and 'Known Questions.' ... IK-IDK rate: ... model refuses to answer a question that is labeled as a 'model-don't-know question' in the test set."

    The paper defines 'known' vs 'unknown' exclusively by the base LLM's repeated-sampling accuracy relative to IK/IDK thresholds (Sec. 3.1). The test-set labels used in Truthful Rate are also generated by repeated sampling of the same base model (Sec. 5.3 shows this for TriviaQA; Appendix B.1 refers to questions 'labeled as a model-don't-know question in the test set'). Training data for IDK-SFT and the adaptive loss are built from the same kind of self-generated labels. Thus the truthfulness metric measures how well the trained model reproduces the base model's own confidence pattern: a model that answers exactly where the base sampled correctly and refuses exactly where the base sampled incorrectly attains high Truthful Rate, even if both behaviors are wrong about external facts.

full rationale

Score 6: the central claim is substantially circular because the evaluation labels are the model's own sampling pattern, which is also what the training optimizes. No significant self-citation circularity: cited prior work (Cheng et al., Zhang et al.) is external and the contrastive loss follows Yan et al. The ALCUNA experiment (Appendix C.1) provides independent external evidence but shows only a 0.5 pt gain over IDK-SFT on artificially unknown questions. Threshold selection in Table 2 appears to be performed on the test set, adding optimism but not changing the circularity diagnosis. If one accepts repeated-sampling accuracy as a definition of 'knowledge', the method is internally consistent; the circularity is that the paper presents this self-consistency as evidence of hallucination reduction.

Assumptions & free parameters 6 free parameters · 4 assumptions · 0 invented entities

The central lever is the self-referential knowledge labeling: the model's own sampled responses define the training and evaluation categories, and the thresholds and weighting are chosen empirically. No new physical or conceptual entities are introduced beyond the knowledge quadrants, which are borrowed from prior work.

free parameters (6)
  • IK (upper threshold) = 1.0 (default)
    Divides known from uncertain knowledge; affects which negative instances are used. No independent justification is given in the paper.
  • IDK (lower threshold) = 0.7 (validation-optimal)
    Divides uncertain from unknown knowledge. Tuned on validation, Table 2 shows best at 0.7; no theory for the value.
  • tau (temperature in contrastive loss) = 0.01
    Set in implementation details (Section 4.1.2); standard contrastive temperature.
  • lambda (upper bound of contrastive weight) = 1
    Set in implementation details (Section 4.1.2); caps the adaptive loss weight.
  • Number of sampled responses per question = 10 (used in experiments, inferred from Section 5.3)
    Used to compute response accuracy for knowledge labeling; not explicitly given as a hyperparameter choice.
  • Lexical matching correctness threshold = ~90%
    Used to decide whether a sampled response counts as correct (Section 3.1); approximate and task-specific.
assumptions (4)
  • domain assumption Repeated sampling accuracy is a valid proxy for knowledge mastery.
    Section 3.1 uses accuracy over multiple sampled responses to place questions into knowledge quadrants. If sampling is noisy or biased, the whole labeling scheme is unstable.
  • domain assumption The knowledge quadrant framework (Yin et al., 2023b) meaningfully describes LLM knowledge states.
    Section 1 adopts the four-quadrant model of Known Knowns, Known Unknowns, Unknown Knowns, and Unknown Unknowns as the basis for the method.
  • domain assumption Lexical matching with about 90% overlap is a reliable automatic correctness metric.
    Section 3.1 uses lexical matching to determine whether model responses are correct; this can misclassify paraphrases or partial answers.
  • ad hoc to paper The adaptive loss weighting max(lambda, detach(L_gen/L_ctr)) improves training.
    Equation 3 introduces this weighting with no derivation or theoretical justification; it is an empirical heuristic.

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Pith. "Pith review of Refine Knowledge of Large Language Models via Adaptive Contrastive Learning." pith.science (2026). https://pith.science/paper/5RAPN2L4

@misc{pith2026250207184,
  author       = {Pith},
  title        = {Pith review of: Refine Knowledge of Large Language Models via Adaptive Contrastive Learning},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/5RAPN2L4}},
  note         = {Machine review of arXiv:2502.07184}
}
read the original abstract

How to alleviate the hallucinations of Large Language Models (LLMs) has always been the fundamental goal pursued by the LLMs research community. Looking through numerous hallucination-related studies, a mainstream category of methods is to reduce hallucinations by optimizing the knowledge representation of LLMs to change their output. Considering that the core focus of these works is the knowledge acquired by models, and knowledge has long been a central theme in human societal progress, we believe that the process of models refining knowledge can greatly benefit from the way humans learn. In our work, by imitating the human learning process, we design an Adaptive Contrastive Learning strategy. Our method flexibly constructs different positive and negative samples for contrastive learning based on LLMs' actual mastery of knowledge. This strategy helps LLMs consolidate the correct knowledge they already possess, deepen their understanding of the correct knowledge they have encountered but not fully grasped, forget the incorrect knowledge they previously learned, and honestly acknowledge the knowledge they lack. Extensive experiments and detailed analyses on widely used datasets demonstrate the effectiveness of our method.

Figures

Figures reproduced from arXiv: 2502.07184 by the authors.

Figure 1
Figure 1. The illustration of our adaptive contrastive learning. Based on the multiple sampling [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. The illustration of the knowledge boundaries and the sample response. [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. The examples of the contrastive learning data. [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figures from the paper (1 more)
Figure 4
Figure 4. Figure 4: Accuracy Distribution for Known and Unknown Questions in TriviaQA. [PITH_FULL_IMAGE:figures/full_fig_p010_4.png]

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    \@ifxundefined[1] #1\@undefined \@firstoftwo \@secondoftwo \@ifnum[1] #1 \@firstoftwo \@secondoftwo \@ifx[1] #1 \@firstoftwo \@secondoftwo [2] @ #1 \@temptokena #2 #1 @ \@temptokena \@ifclassloaded agu2001 natbib The agu2001 class already includes natbib coding, so you should ...

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    @open @close @open @close and [1] URL: #1 \@ifundefined chapter * \@mkboth \@ifxundefined @sectionbib * \@mkboth * \@mkboth\@gobbletwo \@ifclassloaded amsart * \@ifclassloaded amsbook * \@ifxundefined @heading @heading NAT@ctr thebibliography [1] @ \@biblabel @NAT@ctr \@bibset...

Pith tools

Reviewed August 8, 2026 · model on record in the stance chip above.