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REVIEW 5 major objections 8 minor 67 references

Saliency Maps are Ambiguous: Analysis of Logical Relations on First and Second Order Attributions

T0 review · 5 major / 8 minor · reviewed 2026-08-10 · deepseek-v4-flash

Pith's one-line read This paper claims that all 14 first-order saliency methods fail to rank logically necessary inputs above irrelevant baselines across all 21 tested logical dataset configurations, making saliency maps ambiguous as relevance rankings.

desk verdict Useful controlled benchmark and scenario rankings, but the central 'all methods fail' claim rests on NIB/GIB metrics that are stricter than the paper's own existential-check assumption. read the letter →

arxiv 2501.14136 v1 pith:HQYFOHSL submitted 2025-01-23 cs.LG

classification cs.LG
keywords deeplearningattentionexplainabilityinterpretabilitylogicdataattributionscoresevaluationANDOR
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

The paper aims to establish that attribution-based saliency methods cannot be trusted as unambiguous importance rankings, even in simple logical classification tasks where the ground-truth reasoning is fully known. It extends the ANDOR framework with five dataset configurations and 21 scenario settings, testing 14 first-order and 4 second-order attribution methods on CNN and Transformer models that reach 100% accuracy. Using a non-informative input baseline, the paper finds that no method consistently ranks all minimally and maximally relevant inputs above the baseline in every scenario. The best overall methods, IntegratedGradients, LRP-Rollout, and Attention, still fail in specific settings, and XOR-heavy scenarios are the hardest. The paper concludes that a single per-input score is an ambiguous explanation and argues for weight-based interpretations that can omit inputs, such as the Global Coherence Representation.

What carries the argument

The central machinery is the ANDOR dataset framework, which generates fully controlled logical classification tasks with AND, OR, and XOR gates plus an irrelevant baseline block, so the complete set of minimally and maximally sufficient feature sets (R_min and R_max) is known for every sample. The paper measures each saliency method's ranking against those ground-truth information sets with the NIB and GIB metrics, and it applies the Global Coherence Representation (GCR), a symbolic global weight-aggregation model that turns local attribution scores into per-symbol, per-position class weights and can classify by weighted membership. The GCR's first-order GTM and second-order FCAM variants show whether saliency scores can function as class-relevance weights when inputs are fully omitted.

What would settle it

Retrain the same ANDOR models with a training objective that explicitly penalizes output sensitivity to baseline inputs, then re-apply NIB/GIB and the threshold-based masking. If no method still fails, the paper's conclusion that saliency maps are inherently ambiguous would be weakened; if the same failures persist in models with zero measured baseline sensitivity, the central claim would be strongly supported.

Watch

Extended reading notes

Core claim

Under the paper's Assumptions A-I, every one of the 14 first-order saliency methods violates at least one expected property in at least one of the 21 ANDOR dataset configurations: for some sample, a logically necessary input from the minimal information set R_min, or a globally relevant input from R_max, is scored below the highest baseline (irrelevant) input. The paper shows that failures concentrate in complementary-information cases and XOR gates, that information is sometimes leaked into masked inputs (DCA metrics), and that second-order aggregation (FCAM) recovers some global class differentiability that first-order scores lose. The authors conclude that saliency scores are ambiguous as local relevance rankings and that a weight-based interpretation, where the scores act as class-relevance weights and inputs can actually be omitted, is a more desirable verification direction.

Load-bearing premise

The load-bearing premise is that the ANDOR truth tables completely specify which inputs a correct explanation must mark as relevant, and that every relevant input must outscore every baseline input in the same sample; if the perfectly accurate model's real-valued output is genuinely sensitive to those baseline inputs, the reported failures may measure model complexity rather than explanation quality.

Editorial extensions

If this is right

  • No analysed first-order saliency map can be read as a standalone ranking of feature importance; every method violates at least one of the paper's stated assumptions in at least one tested configuration.
  • XOR-like or complementary-information settings are the hardest for all methods, supporting the paper's case that second-order attribution scores are needed to capture joint input relevance.
  • Methods with good local information capture, such as IntegratedGradients, do not necessarily produce globally comparable scores, so local and global interpretations of the same method can disagree.
  • A weight-based interpretation such as the GCR can preserve class differentiability even when first-order rankings fail, suggesting that input-omitting interpretations are more promising than raw heatmap rankings.

Reading between the lines

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

  • If the reported failures partly reflect real-valued model outputs rather than explanation-method flaws, then the NIB/GIB metrics may conflate explanation quality with model complexity; a cleaner test would measure NIB/GIB on models with explicitly zero sensitivity to baseline inputs.
  • The scenario ranking suggests a practical selector: for AND-OR-like tasks, perturbation-based methods may be defensible, while XOR-heavy tasks should probably receive higher-order explanations by default.
  • A direct extension would replace the fixed 'highest baseline score' threshold with per-method calibrated thresholds; if ranking conclusions change, part of the observed ambiguity is a threshold artifact rather than an inherent property of saliency scores.
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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

5 major / 8 minor

Summary. The paper extends the authors' ANDOR logical dataset framework to evaluate the reliability of saliency maps. It trains CNN and Transformer models on 21 ANDOR dataset configurations and applies 14 first-order and 4 second-order attribution methods, spanning 336 experiments and 404,880 trained models. The central empirical claim is that no analysed saliency method consistently ranks all logically necessary inputs above a non-informative baseline; IntegratedGradients, LRP-Rollout, and Attention are identified as the best, yet still imperfect. The paper also proposes the Global Coherence Representation (GCR) as a weight-based, global interpretation and evaluation approach, and it provides per-scenario rankings of methods across multiple metrics (NIB, GIB, logical accuracy, DCA, correlation, GCR fidelity).

Significance. If the central negative result holds, it is an important contribution to XAI, suggesting fundamental limits of first-order attribution maps even in fully controlled logical tasks with externally defined ground truth. The scale of the experiments and the explicit logical ground truth are strengths, as is the open-source code. The paper also offers practical per-scenario comparisons of 14 first-order and 4 second-order methods, which is valuable. However, the validity of the main claim depends on the strictness of the NIB/GIB metrics and on the assumption that a 100%-accurate model's decision behavior is fully reducible to the logical formula. The GCR proposal is interesting but requires additional validation to avoid circularity.

major comments (5)
  1. [IV-C, III-A, III-C] The NIB and GIB definitions implement a universal quantification over all minimal/maximal sets, which is stronger than the paper's own Assumption B and the Section III-A statement that the ranking should "match one possible reasoning r in Rd_min". For an OR-positive sample with two positive inputs, if one positive input scores above the baseline and the other below, NIB counts the sample as failed even though a sufficient minimal set is correctly ranked. Similarly, GIB counts every Rd_max input that falls below the baseline as a miss. This inflates failure rates and directly drives the central "all methods fail" claim. Please report an existential variant (e.g., the percentage of samples with at least one fully correct minimal set) and a redundant-aware variant, and clarify which of the paper's claims each metric supports.
  2. [V-A, Table II] The per-method interpretation mode (AsIs/Cutoff/Absolute) is selected based on the NIB metric on the same test data used for the reported NIB results. This is a selection-on-target procedure: methods with more flexible post-processing benefit, and the reported NIB values are optimistically biased. While this does not rescue any method to a perfect score, it affects the cross-method ranking (Table IV) and the claim that IntegratedGradients is best at information capturing. Please select modes on a held-out validation set or pre-specify them per method, and report results for all three modes so readers can assess sensitivity.
  3. [V-E, VI-B] The paper's own correlation analysis shows that baseline inputs alter model outputs: "changing irrelevant inputs will likely (slightly) change the numeric output." This means the 100%-accurate models are not exact implementations of the ANDOR formula, so NIB/GIB failures could measure model sensitivity to baseline inputs rather than explanation quality. The Limitations section acknowledges that the model output does not have zero error, but it asserts that relevant inputs should still be scored highest because inputs are independent. This assertion needs quantitative support: for example, report the effect size of baseline inputs on output logits relative to relevant inputs, or verify that the NIB/GIB failures persist for models with near-zero loss.
  4. [V-E, Figure 12] The text and Figure 12 report "significant (p < 0.5) Pearson correlations". If p<0.5 is literal, this is not a valid significance threshold and invalidates the correlation analysis, since nearly all correlations would be "significant". If it is a typo for p<0.05, the percentage-of-significant-cases panel changes substantially. Please correct the threshold and recompute the correlation results.
  5. [III-D, V-F] The GCR is both proposed as an interpretation framework and used as an evaluation tool via GCR Fidelity and tGCR Fidelity. The membership functions (Eq. 2 and Eq. 4) are defined by the authors without an axiomatic justification, and using them to evaluate saliency methods is partly circular. High GCR fidelity may reflect the averaging properties of the GCR rather than the quality of the saliency scores. Please validate the GCR against independent aggregation schemes (e.g., simple linear probes or other global aggregation baselines) and clearly state which conclusions depend on the GCR's specific assumptions.
minor comments (8)
  1. [III-C] The assumptions are labeled (A), (B), (C), (D), (E), (F), (H), (I), skipping (G); please renumber or add a missing item.
  2. [Abstract] Typo: "confirmations bias" should be "confirmation bias".
  3. [IV-C] The Full-DCA definition uses "N rB" which is undefined.
  4. [V-E] The text refers to Assumption I when the relevant assumption on undesired correlations is Assumption H; please fix the cross-reference.
  5. [III-F] The dataset size for 2inQuaternary is given as 65526; it should be 65536 (=4^8).
  6. [Appendix Figure 18] The caption "verage Full-DCA" should be "Average Full-DCA".
  7. [V-H] Table III labels GCR FCAM/GTM values as "Acc." while the text describes them as "global differentiability"; please clarify whether these are accuracies or normalized scores.
  8. [II] The related work could more explicitly summarize how this work differs from the authors' previous [4] in terms of new datasets, metrics, and second-order methods.

Circularity Check

0 steps flagged · score 2.0 of 10

No significant circularity: NIB/GIB are compared to an externally defined truth-table ground truth, and the GCR self-citations are descriptive rather than load-bearing.

full rationale

The central empirical claim is not circular: NIB/GIB compare saliency-score rankings against Rd_min and Rd_max, which are defined from the ANDOR truth tables (Section III-A) and the baseline-input rule (Assumption E), independently of any saliency method. The all-methods-fail result is therefore a substantive finding relative to that external ground truth, not an identity. The paper's self-citations to [4] and [5,6,7] are descriptive rather than load-bearing: the ANDOR formalization and assumptions are restated in Sections III-A and III-C, and the GCR is specified by explicit membership equations (Eqs. 1-4), so the evaluation does not reduce to an unverified citation. The disclosed per-method selection of score interpretation mode (AsIs/Cutoff/Absolute) using the NIB metric is a transparency concern and could inflate relative rankings, but it is not a hidden circular step because it is stated and because the central failure claim holds even under the best mode. The closest issue is that NIB/GIB quantify exhaustively over all minimal/maximal sets, which conflicts with the existential 'matches one possible reasoning r in Rd_min' wording and Assumption B in redundant scenarios; however, this is a validity/interpretation mismatch between the metric and the paper's own assumptions, not an equivalence-by-construction between the ground truth and the output, so it does not make the derivation circular. Overall, the paper is self-contained against an external logical benchmark.

Assumptions & free parameters 3 free parameters · 4 assumptions · 0 invented entities

The central claim rests on three domain assumptions about the ANDOR ground truth and score interpretation, plus one modeling choice from the authors' prior GCR work. No new physical entities are proposed; the GCR is a method carried over from earlier papers by the same authors. The free parameters are the per-method interpretation mode selected on NIB, the DCA threshold factors, and the unspecified GCR/SAX hyperparameters.

free parameters (3)
  • Per-method saliency interpretation mode (AsIs/Cutoff/Absolute) = See Table II (e.g., IntegratedGradients: Absolute, LRP-Full: Cutoff)
    Selected as the best-performing mode on the NIB metric (Section V-A), then reused for all reported metrics, creating a mild fit to the evaluation target.
  • Full-DCA threshold factors = 1.0, 0.8, 0.5
    Introduced in Section IV-D as three manual factors multiplying the average sample score for leakage measurement; the values are arbitrary design choices.
  • GCR/SAX hyperparameters (alphabet size v, symbol mapping) = Not stated in the paper; only referenced via code
    The GTM/FCAM fidelity results depend on these values (Section III-D), but they are not reported, so an independent replication must recover them from the repository.
assumptions (4)
  • domain assumption The ANDOR truth-table sets Rd_min and Rd_max are the complete set of valid model reasonings for each dataset (Section III-A and III-G).
    The metrics score a saliency method as failing whenever its ranking does not match a minimal logical subset; this is the ground-truth benchmark rather than a derived fact.
  • domain assumption Baseline inputs are truly class-irrelevant, and any relevant input must be scored above the highest baseline input per sample (Assumptions D and E, Section III-C).
    NIB, GIB, and the masking threshold all depend on this; the paper's own correlation results indicate baseline inputs do affect the model's real-valued outputs, which weakens this assumption.
  • domain assumption Saliency score ordering is meaningful and scores are globally comparable across samples (Assumptions A and I, Section III-C).
    The GCR aggregation and all ranking-based metrics require that a higher score means more relevance and that equal scores across samples mean similar importance.
  • ad hoc to paper The GCR membership functions (Equations 2 and 4) are a valid way to interpret attribution scores as classification weights.
    The normalization by the maximum reachable score per class is a design choice from the authors' prior GCR work [5,6,7], not an independently established standard.

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Pith. "Pith review of Saliency Maps are Ambiguous: Analysis of Logical Relations on First and Second Order Attributions." pith.science (2026). https://pith.science/paper/HQYFOHSL

@misc{pith2026250114136,
  author       = {Pith},
  title        = {Pith review of: Saliency Maps are Ambiguous: Analysis of Logical Relations on First and Second Order Attributions},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/HQYFOHSL}},
  note         = {Machine review of arXiv:2501.14136}
}
read the original abstract

Recent work uncovered potential flaws in \eg attribution or heatmap based saliency methods. A typical flaw is a confirmations bias, where the scores are compared to human expectation. Since measuring the quality of saliency methods is hard due to missing ground truth model reasoning, finding general limitations is also hard. This is further complicated, because masking-based evaluation on complex data can easily introduce a bias, as most methods cannot fully ignore inputs. In this work, we extend our previous analysis on the logical dataset framework ANDOR, where we showed that all analysed saliency methods fail to grasp all needed classification information for all possible scenarios. Specifically, this paper extends our previous work using analysis on more datasets, in order to better understand in which scenarios the saliency methods fail. Further, we apply the Global Coherence Representation as an additional evaluation method in order to enable actual input omission.

Figures

Figures reproduced from arXiv: 2501.14136 by the authors.

Figure 1
Figure 1. The process pipeline of our Global Coherence Representation, cf. [7]. [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Example visualisation for a SAX discretization, cf. [49]: Each data [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Two FCAMs from the Synthetic dataset, w.r.t. class 4 (left) repre [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figures from the paper (18 more)
Figure 4
Figure 4. Figure 4: Two GTMs from the Synthetic dataset, w.r.t. class 4 (left) representing [PITH_FULL_IMAGE:figures/full_fig_p005_4.png]
Figure 5
Figure 5. Figure 5: Framework for the ANDOR dataset. AND OR AND / OR / XOR XOR Baseline I1 I2 I3 I4 I5 I6 I7 I8 I9 I10 I11 I12 AND / OR / XOR I1 I2 I3 I4 I5 I6 I7 I8 AND XOR OR Baseline 3inBinary: Possible Inputs M={-1, 1} Positive Inputs T = {1} Size = 2^12 = 4096 AND / OR / XOR I1 I2 I3…
Figure 6
Figure 6. Figure 6: The five different ANDOR dataset configurations we use. [PITH_FULL_IMAGE:figures/full_fig_p006_6.png]
Figure 7
Figure 7. Figure 7: Average Tree Importance scores for the Random Forest models, differentiating between datasets and gates. [PITH_FULL_IMAGE:figures/full_fig_p009_7.png]
Figure 8
Figure 8. Figure 8: Average NIB/GIB-Full and NIB/GIB-Balanced results for each saliency method, ranked in and differentiated between the different scenarios. Only [PITH_FULL_IMAGE:figures/full_fig_p011_8.png]
Figure 9
Figure 9. Figure 9: Average re-train performance after masking all data below or equal to the highest baseline input score per sample per saliency method, ranked in and [PITH_FULL_IMAGE:figures/full_fig_p011_9.png]
Figure 10
Figure 10. Figure 10: Average logical and statistical logical accuracy difference to the re-trained models per saliency method, considering the masked data and ranked per [PITH_FULL_IMAGE:figures/full_fig_p012_10.png]
Figure 11
Figure 11. Figure 11: Average Full-DCA and minimal-DCA results for each saliency method, ranked in and differentiated between the different scenarios. Only considering [PITH_FULL_IMAGE:figures/full_fig_p012_11.png]
Figure 12
Figure 12. Figure 12: Average significant (p < 0.5) Pearson correlation from the baseline scores to all other scores from the sample, averaged over all models (top) and average (over all split test data on 100% acc. base models) percentage of correlations that are significant from all poss…
Figure 13
Figure 13. Figure 13: Average GCR fidelity results for each saliency method, ranked in and differentiated between the different scenarios. Only considering the split test [PITH_FULL_IMAGE:figures/full_fig_p014_13.png]
Figure 14
Figure 14. Figure 14: Average tGCR fidelity results for each saliency method, ranked in and differentiated between the different scenarios. Only considering the split test [PITH_FULL_IMAGE:figures/full_fig_p014_14.png]
Figure 15
Figure 15. Figure 15: Average NIB/GIB-Full and NIB/GIB-Balanced results for each saliency method, ranked in and differentiated between the different scenarios. [PITH_FULL_IMAGE:figures/full_fig_p021_15.png]
Figure 16
Figure 16. Figure 16: Average re-train performance after masking all data below or equal to the highest baseline input score per sample per saliency method, ranked in [PITH_FULL_IMAGE:figures/full_fig_p021_16.png]
Figure 17
Figure 17. Figure 17: Average logical and statistical logical accuracy difference to the re-trained models per saliency method, considering the masked data and ranked per [PITH_FULL_IMAGE:figures/full_fig_p022_17.png]
Figure 18
Figure 18. Figure 18: verage Full-DCA and minimal-DCA results for each saliency method, ranked in and differentiated between the different scenarios. Considering all [PITH_FULL_IMAGE:figures/full_fig_p022_18.png]
Figure 19
Figure 19. Figure 19: Average significant (p < 0.5) Pearson correlation from the baseline scores to all other scores from the sample, averaged over all models (top) and average (over all models) percentage of correlations that are significant from all possible ones (bottom). Results ranked…
Figure 20
Figure 20. Figure 20: Average GCR fidelity results for each saliency method, ranked in and differentiated between the different scenarios. Considering all trained base [PITH_FULL_IMAGE:figures/full_fig_p023_20.png]
Figure 21
Figure 21. Figure 21: Average tGCR fidelity results for each saliency method, ranked in and differentiated between the different scenarios. Considering all trained base [PITH_FULL_IMAGE:figures/full_fig_p023_21.png]

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