REVIEW 3 major objections 5 minor 68 references
On the Performance of Concept Probing: The Influence of the Data (Extended Version)
T0 review · 3 major / 5 minor · reviewed 2026-08-06 · deepseek-v4-flash
Pith's one-line read Concept probes reach 97% of peak accuracy with as few as 250 labeled samples, and can reuse the original model's training data without losing accuracy.
desk verdict A genuinely useful empirical study of what data concept probing needs, with headline numbers that mostly hold up but are narrower than they look. 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 probe $g$, a classifier trained on activations $f_u(x)$ produced by a layer or unit set $u$ of an original model $f$ to predict a concept value $c$; the paper considers five probe architectures: linear Logistic and Ridge classifiers, LightGBM decision trees, a feedforward neural network, and a mapping-network probe that selects units from multiple layers via an input-reduce procedure. The experiments vary four dimensions of the probe dataset $D_g$, namely its size, the scale of the probed model, the fraction of samples reused from the original model's training set, and the amount of label noise, while separating concepts into relevant and non-relevant relative to the model's task because the authors hypothesize that task-relevant concepts are easier to probe. The paper also contributes new concept labels for GTSRB and revised attribute labels for CUB, which serve as test beds for the data-quality experiments.
What would settle it
Train the same five probes on randomly selected layers, including early convolution layers, and on additional datasets, then measure accuracy at 250 training samples and at 100% data reuse; if probe accuracy for relevant concepts falls well below 97.3% of its peak, or if full reuse produces a statistically significant accuracy drop, the paper's central claims would be contradicted.
Extended reading notes
Core claim
The central claim is that concept probing is data-cheap, scale-friendly, and reuse-tolerant for image classifiers. For task-relevant concepts, probe accuracy climbs quickly and stabilizes around 200 training samples, while non-relevant concepts need more data and perform substantially worse. Scaling the original model up within the tested ranges slightly improves probe accuracy, by an average of 1.8%, whereas scaling it down hurts accuracy by an average of 3.9%, suggesting that larger representations remain probeable. Probe accuracy stays essentially flat when the probe is trained entirely on the original model's own training data, with a best-fit slope of $-4.1\times10^{-3}$ that is not statistically significant. Label noise up to roughly 20% causes a 9.3% relative accuracy drop, and naturally noisy CUB attribute labels, where 18.2% of labels are incorrect and the noise is concentrated on false positives, cost 13.1% relative accuracy, implying that data quality still matters even though probes are moderately robust.
Load-bearing premise
The broad claims that larger models are easy to probe and that reusing the original training data is harmless rest on experiments with only two datasets, GTSRB and XTRAINS, and on layers chosen by inspection because earlier layers seemed not to capture the probed concepts; if those settings are atypical, the generality of those claims fails.
Editorial extensions
If this is right
- Practitioners can build reliable probes for task-relevant concepts with a few hundred balanced labeled examples rather than large dedicated datasets.
- Existing training data of the probed model can be repurposed for probing, easing application in data-scarce domains.
- Probing remains feasible, and may even benefit slightly, when the original model is scaled up, so growing model size alone is not a barrier.
- Probe results should be reported together with data-quality checks, because label noise above roughly 30% degrades probes sharply and realistic non-random noise is costlier than random noise.
- The released GTSRB concept labels and revised CUB attribute labels give other researchers standard data for further probing experiments.
Reading between the lines
- A testable extension left implicit by the paper is to repeat the data-size and reuse curves on transformer-based language models, since the current experiments cover only image classifiers.
- Because the scaled-model and reuse experiments run only on GTSRB and XTRAINS, the strongest reading is that these effects hold for visual classifiers trained from scratch on moderately sized datasets; extrapolation to very large pretrained models is an inference rather than a result of this paper.
- The paper's relevance-based distinction suggests a practical heuristic, that practitioners should measure how separable and task-relevant a concept is before deciding how much probe data to collect, although this heuristic is not itself tested here.
- The finding that real CUB label noise is mostly false positives implies that simple noise-rate estimates can understate the true cost of noisy concept labels, so auditing which label class carries the noise would sharpen quality control.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper investigates how characteristics of the data used to train concept probes affect probe performance in image classification. Four dimensions are studied: training-set size, original-model size, reuse of the original model's training data, and label noise. The authors use five probe architectures (logistic regression, ridge regression, LightGBM, a small neural network, and a mapping-network probe) on eight models spanning six datasets. The central empirical claims are that task-relevant concepts can be probed with few training samples (97.3% of the maximum measured accuracy with 250 samples), that larger original models do not hurt probe accuracy, that reusing the original model's training data does not degrade probe accuracy, and that probes tolerate moderate label noise. The paper also contributes relabeled CUB attributes and a GTSRB concept ontology with labels.
Significance. If the central claims hold, the paper gives practitioners concrete guidance: hundreds of labeled examples may suffice for probing relevant concepts, and existing training data can be repurposed without obvious harm. This addresses a real gap, since most concept-probing research has focused on probe architecture or interpretation rather than on data requirements. The paper's strengths include the breadth of probe architectures compared, the balanced repeated-trial protocol, the careful manual relabeling of CUB attributes in Appendix A, and the explicit ontology-based labeling procedure for GTSRB in Appendix B. The main weakness is that the strongest headline claims are built on a restricted set of hand-picked layers and, for the model-size and data-reuse conclusions, on only two datasets; these restrictions are disclosed but their effect on the generality of the claims is not quantified.
major comments (3)
- [Section 3.2, Probed Activations] The layer-selection procedure removes early layers by inspection: for ResNet models only the first and last convolution blocks of the fourth residual block are probed, and for ViT only the last transformer block, because the authors state that 'the activations resulting from the previous blocks seemed to not yet capture the probed concepts.' The headline result in Section 4 that probe accuracy reaches 97.3% of its maximum with 250 training samples is therefore an average over a set of late, hand-picked layers, and the excluded early layers never enter the average. A practitioner who must search over layers without knowing which one captures a concept faces a different data requirement. The disclosure of the selection is transparent, but its effect on the headline number is not quantified; please report per-layer results or explicitly qualify the claim as applying to late, concept-bearing layers.
- [Section 4, Effect of Train Dataset Size] The method behind the '97.3% of its maximum measured value with as few as 250 training samples' statistic is not defined. It is unclear whether the percentage is averaged over relevant concepts only, over all five probe architectures, and over all probed layers, and how 'maximum measured value' is computed from the curves in Figure 2. The figure shows only averaged curves over five repetitions with no error bars or confidence intervals. Since this number is the paper's headline claim and the basis for the practical recommendation, the exact aggregation protocol and a measure of variability must be provided so the claim can be independently verified.
- [Sections 5-6, Figures 3-4] The conclusions that larger original models are not harder to probe and that reusing the original model's training data does not affect probe accuracy are based on only the GTSRB and XTRAINS settings, one of which is synthetic. The paper acknowledges this limitation in Section 5, but Section 9 states these findings without qualification, for example 'repurposing the data involved in the training of the probed model to train probing models does not degrade their resulting test accuracy.' In addition, Figure 3 reports a 1.8% improvement and a 3.9% degradation without error bars or statistical tests, so the size-scaling effects could be within repetition noise. Please either restrict the conclusions to the two tested settings or provide additional evidence, and add variance reporting to Figure 3.
minor comments (5)
- [Section 4, parenthetical claim] The parenthetical 'about 0.8% of the original model's training data' is not a meaningful average across the six datasets, whose training-set sizes differ by orders of magnitude; please specify the dataset for which this holds or remove the parenthetical.
- [Figures 2-5] Since every result is averaged over five repetitions, the lack of error bars or per-repetition points makes it difficult to assess the stability of the reported differences; consider adding confidence intervals to all figures.
- [Section 3.1] The hyperparameter search is described only for the Ridge probe; please state explicitly how hyperparameters for the other probe architectures were chosen, even if they were fixed by default values.
- [Section 3.2] There is a typo in the XTRAINS description: 'PassangerTrains' should be 'PassengerTrains.'
- [Figure captions] The legends labeled 'Relevant Non-Relevant' in Figures 2-5 are not explained in the captions; please define 'relevant' and 'non-relevant' or point readers to Section 3.2.
Circularity Check
No significant circularity: all headline claims are empirical measurements of probe accuracy on held-out test data, not derivations from the inputs that define them.
full rationale
The paper's central claims concern measured probe accuracy as a function of training-data size (Section 4), original-model scale (Section 5), data reuse (Section 6), and label noise (Section 7). Each of these is an empirical curve computed on balanced held-out test sets D'_g, so the reported numbers are not derived from the probe's own training data or from the definitions of the concepts. The 97.3%-at-250-samples figure is a descriptive summary of measured accuracies, not a quantity forced by construction. The relevant/non-relevant distinction is defined via an ontology and a formal relevancy notion from the authors' prior work [13], but it is not defined in terms of probe accuracy; comparing measured accuracies across relevance classes is therefore not tautological. The paper does rely on author-generated resources (XTRAINS, the GTSRB ontology and labels, the CUB relabeling), and it cites the authors' own work for the relevancy definition and the dataset. However, these are experimental inputs, not load-bearing proof of the empirical conclusions: the probe accuracies are measured independently against fresh test examples. The layer-selection heuristic is also disclosed ('the activations resulting from the previous blocks seemed to not yet capture the probed concepts', Section 3.2), and it is a scope limitation about external validity rather than a circular reduction, since no layer choice is defined in terms of the probe accuracies it produces. The data-reuse analysis fits a line and reports a t-test; this is a descriptive regression, not a fitted parameter relabeled as a prediction. No equation in the paper reduces to its own input, and no uniqueness theorem or self-citation chain forces the stated conclusions. Hence the paper is empirically self-contained with respect to its claims, and no circular step is present.
Assumptions & free parameters
assumptions (4)
- domain assumption A concept relevant to a model's task is likely reflected in its internal representations.
- domain assumption Relevance can be determined from Description Logic ontologies built by the authors for GTSRB and XTRAINS, and by author judgment for ImageNet, DeepFashion, Places365, and CUB.
- domain assumption The manually relabeled CUB attribute labels are correct ground truth for measuring natural label noise.
- domain assumption Balanced accuracy on a held-out probe test set measures how much information representations carry about a concept.
Cite this review
Pith. "Pith review of On the Performance of Concept Probing: The Influence of the Data (Extended Version)." pith.science (2026). https://pith.science/paper/2624OZYT
@misc{pith2026250718550,
author = {Pith},
title = {Pith review of: On the Performance of Concept Probing: The Influence of the Data (Extended Version)},
year = {2026},
howpublished = {\url{https://pith.science/paper/2624OZYT}},
note = {Machine review of arXiv:2507.18550}
}
read the original abstract
Concept probing has recently garnered increasing interest as a way to help interpret artificial neural networks, dealing both with their typically large size and their subsymbolic nature, which ultimately renders them unfeasible for direct human interpretation. Concept probing works by training additional classifiers to map the internal representations of a model into human-defined concepts of interest, thus allowing humans to peek inside artificial neural networks. Research on concept probing has mainly focused on the model being probed or the probing model itself, paying limited attention to the data required to train such probing models. In this paper, we address this gap. Focusing on concept probing in the context of image classification tasks, we investigate the effect of the data used to train probing models on their performance. We also make available concept labels for two widely used datasets.
Figures
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Reference graph
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1968
Reviewed August 6, 2026 · model on record in the stance chip above.
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