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REVIEW 3 major objections 5 minor 46 references

Generating visual explanations from deep networks using implicit neural representations

T0 review · 3 major / 5 minor · reviewed 2026-08-10 · deepseek-v4-flash

Pith's one-line read This paper argues that implicit neural representations — coordinate-based networks that map pixel positions and an area condition to a mask value — make attribution masks smoothly queryable by area and allow several non-overlapping…

desk verdict A solid, clearly written method paper that makes a real contribution by adapting INRs to attribution masks, but the advertised area-continuity advantage is asserted more than demonstrated. read the letter →

arxiv 2501.11784 v1 pith:KJ4B4AN6 submitted 2025-01-20 cs.CV

classification cs.CV
keywords implicitneuralrepresentationsattributionmasksextremalperturbationsexplainableAIsaliencymapsmultipleexplanationsDicelossmodelinterpretability
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 show that implicit neural representations (INRs) are a natural home for visual explanation, not just for image synthesis. It recasts extremal perturbations as a single coordinate-based network conditioned on a mask-area parameter, so one trained network can produce an attribution mask for any requested area instead of re-optimizing from scratch. Adding a soft Dice loss makes the same setup produce a sequence of non-overlapping masks, exposing that a classifier may rely on object context such as sky and water as much as on the object itself. The reported precision scores on ImageNet-S and PASCAL VOC indicate the method is competitive with or better than existing baselines while offering the new continuity and multi-explanation properties.

What carries the argument

The load-bearing mechanism is the conditioned implicit neural representation of the attribution mask: an MLP whose input is the pair of pixel coordinates and a scalar area value, with a Fourier feature encoding of both, and whose output is filtered through a radial-basis-function smoothing step. The area conditioning ties coordinates and area together so the network must interpolate masks across the whole area range. A soft Dice loss is added for the multi-mask variant, enforcing that newly generated masks avoid already explained regions.

What would settle it

Train the INR as described, then evaluate the mask at a dense grid of area parameters such as 0.025, 0.04, 0.06, 0.08, 0.1, 0.15, 0.2 and compute both the true mask area and the pairwise overlap of consecutive masks. If the true area does not rise monotonically with the requested area, or if adjacent masks differ discontinuously by swapping to a different image region, the central continuity claim is disproved. A direct test of generalization is to train on a few discrete area values only and evaluate at held-out values in between.

Watch

Extended reading notes

Core claim

The central discovery is that a mask over the input image can be represented as an implicit function of pixel coordinates and an area. A multilayer perceptron with Fourier feature encoding takes $(x, a)$ and outputs a scalar mask value, which is then smoothed; during training $a$ is sampled uniformly, so the result is a continuum of masks rather than a set of discrete solutions. The same implicit function, retrained with a soft Dice penalty against previous masks, yields non-overlapping explanations. On ImageNet-S the method reaches a mean precision of 0.68 and a hit rate of 0.73; on PASCAL VOC it is statistically tied with extremal perturbations, and the iterative procedure shows that later masks drift outside the object while the best of the first three iterations reaches 0.73 precision.

Load-bearing premise

The method's claimed advantage depends on a single INR, trained with area values sampled uniformly, generalizing smoothly and monotonically between those values; if the network merely memorizes the sampled areas, the masks will not be well-behaved for unseen area queries.

Editorial extensions

If this is right

  • A single trained INR per image can be queried at any mask area without retraining, making area sweeps and interactive explanation tools practical.
  • The iterative Dice-loss procedure provides a concrete way to surface contextual biases: masks outside the reference segmentation reveal what scene elements, such as sky and water for boats, the classifier uses.
  • Reported ImageNet-S precision of 0.68 and a combined first-three-iterations maximum of 0.73 suggest the method can recover the object region while also mapping the object's surroundings.
  • Because the same network architecture handles both single and multiple masks by changing only the loss, the approach slots into existing INR toolchains for joint tasks like segmentation.

Reading between the lines

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

  • Beyond the paper's experiments, the area-conditioned INR could power a real-time 'explanation slider' for debugging interfaces, since the same weights answer arbitrary area queries without re-optimization.
  • The non-overlap mechanism could be turned into a quantitative bias score by measuring how much of each successive mask falls outside the reference segmentation, giving a per-class context-dependence measure.
  • If the continuity claim holds at higher resolutions, combining the INR with a learned initialization could bring per-case training time down enough for clinical or interactive use.
  • The same mask representation already uses a segmentation-style Dice loss, so attribution and semantic segmentation could plausibly be optimized jointly in one implicit network.
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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

3 major / 5 minor

Summary. The manuscript proposes using implicit neural representations (INRs) to generate attribution masks for deep image classifiers. The first contribution reformulates extremal perturbations: a coordinate-based MLP, conditioned on an area parameter a uniformly sampled from [0,1], is trained against the post-softmax probability with an area-sorting regularizer (Eqs. 2–4), yielding masks that the authors claim are smooth and continuous in a. The second contribution is an iterative procedure that adds a Dice-based penalty to the loss (Eq. 6) to generate multiple non-overlapping attribution masks for the same image (Algorithm 1). Experiments use pretrained ResNet50 models on 752 ImageNet-S validation images and 2230 PASCAL VOC 2007 test images; the method is compared with extremal perturbations, RISE, and GradCAM using precision and hit rate. The reported numbers are a mean precision of 0.68 on ImageNet (vs. 0.63 for extremal perturbations) and 0.44 on VOC (vs. 0.46, asserted not statistically significant), with successive explanations on ImageNet degrading in precision from 0.68 to 0.30.

Significance. If the empirical claims are substantiated, the paper would make a useful contribution to explainable AI: a single INR conditioned on an area parameter is a practical way to query attribution masks at arbitrary areas without retraining, and the iterative non-overlap procedure can reveal that a classifier uses contextual regions (e.g., water and sky for 'boat') rather than only the object itself. The authors release code and evaluate on two datasets with a standard pretrained architecture, which is commendable. The main weaknesses are that the paper's headline advantage—area-continuity and monotonicity—is not measured quantitatively, and the statistical reporting is incomplete (no variances despite five training runs per image, and an unspecified t-test). These gaps are load-bearing for the central claims, but they are addressable with additional analysis rather than being fundamental flaws.

major comments (3)
  1. [Abstract, Section 4.1, Section 3.4] The abstract and Section 1 advertise 'well-behaved' attribution masks with respect to the area constraint, and Section 4.1 claims 'better monotonic correspondence between the area constraint and the actual calculated mask area.' This is a principal claimed advantage over extremal perturbations, yet the training procedure in Section 3.4 supervises each sampled area independently through Eq. (2) and Eq. (3); nothing in the loss explicitly enforces continuity or monotonicity across neighboring area values. Figure 1 is qualitative, and Section 4.1 reports no quantitative metric for continuity or monotonicity. Since the evaluation only uses a in {0.025, 0.05, 0.1, 0.2}, the behavior at interpolated areas is not demonstrated. Please define and report a quantitative measure, for example the mean absolute deviation of the computed mask area from the target a, or the average per-pixel overlap between masks at adjacent area values, including areas not used in the evaluation; alternatively, temper the continuity claims to what the experiments actually support.
  2. [Section 3.3.1, Table 1] The text states that the implicit network was trained five times per input image to evaluate variability with respect to weight initialization, but Table 1 reports only mean precision and hit rate values, with no standard deviations, confidence intervals, or per-image distributions. The claim that the VOC difference between the proposed method (0.44) and extremal perturbations (0.46) is 'not statistically significant' cannot be checked without these details, and the t-test setup (paired or unpaired, per-image or per-mask, correction for multiple comparisons) is not described. Please report variance statistics and a precise statistical protocol, or move the significance statement to results that include them.
  3. [Algorithm 1, line 2] In Algorithm 1, the baseline mask is computed as M^b = sum_{i=0}^n M_i before M_n has been generated; for n=1 this includes the undefined mask M_1. This contradicts the accompanying text, which says previously computed masks are combined, and an implementation following the pseudocode literally would not impose the intended non-overlap penalty. The sum should run over i=0,...,n-1 (or, equivalently, over the masks output before iteration n). This is a small but load-bearing correction for the reproducibility of the multiple-explanation method.
minor comments (5)
  1. [Section 3.1] The notation 'x ∈ R2 → [0,1]^2' is garbled; it should state that pixel coordinates are x ∈ [0,1]^2 (after normalization).
  2. [Equation (4)] The network is defined as f_l(x,c) with a conditioning variable c, but the surrounding text only introduces the coordinates x and the area parameter a; please define c or replace it with a consistently.
  3. [Section 3.4] The binarization procedure is specified only for GradCAM and RISE saliency maps. Since the precision metric in Eq. (7) applies to binary masks, the authors should state explicitly how the soft masks produced by the proposed method and by extremal perturbations are converted to binary masks (e.g., threshold at 0.5 or another value).
  4. [Table 2] The 'Combination, max' row is ambiguous: it should state that the maximum precision is taken over the three iterations for each image and then averaged across images, rather than being a single global maximum.
  5. [Section 4.1] The phrase 'actual calculated mask area' is not defined. It should be clarified whether this is the sum of soft mask values, the area after binarization at a fixed threshold, or another quantity.

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity: the attribution masks are optimized against the explained model and evaluated against external segmentations, so the central claims are not equivalent to their inputs.

full rationale

The paper's derivation chain is self-contained. Masks are obtained by optimizing the post-softmax probability of the explained model under the area regularization of Eq. (2)-(3), and the evaluated quantities (precision against ImageNet-S segmentations and PASCAL VOC bounding boxes, hit rates, iteration-wise precision) are external benchmarks, not quantities fitted into the method. The area-conditioned INR is trained with a uniformly sampled area parameter and evaluated at fixed areas {0.025, 0.05, 0.1, 0.2}; the claimed smoothness and monotonicity are empirical properties of the learned mapping, not identities enforced by the loss. The only author self-citation ([5]) concerns a prior INR application to gene-expression images and is not load-bearing for the attribution claims. The paper honestly lists limitations, including that the explaining network is itself a black box and that convergence may be harder at high resolution; these are evidence-quality caveats, not circular steps. The skeptics' concern that area-continuity is only shown qualitatively is a missing-evidence issue rather than a circularity issue: no equation or fitted parameter is reused to define the evaluated result. The off-by-one point in Algorithm 1 line 2 is a pseudocode correctness concern, not a circular-derivation concern.

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

The ledger is modest. The method uses standard optimization machinery and standard perturbation assumptions from prior attribution work; it introduces no new physical or conceptual entities. The hand-chosen numbers (lambda_r, lambda_d, Fourier encoding size, baseline thresholds) do not by themselves force the central result, but they are not derived from any principle and the sensitivity of the conclusions to them is not examined.

free parameters (4)
  • lambda_r = 1
    Area regularization weight in Eq. 2, chosen by hand; controls trade-off between prediction score and area constraint.
  • lambda_d = 1
    Dice non-overlap weight in Eq. 6, chosen by hand; controls how strongly new masks avoid the baseline masks.
  • Fourier encoding configuration = 6 frequencies, 128 components
    Hand-chosen input encoding in Section 3.4; determines the frequency range and smoothness the INR can represent.
  • Baseline binarization thresholds = 0.2 (ImageNet), 0.5 (PASCAL VOC)
    Manually selected cut-offs in Section 3.4 for thresholding GradCAM and RISE saliency maps; affects the comparison, not the proposed method itself.
assumptions (4)
  • domain assumption Gradient-based training of Eq. 2 converges to a locally meaningful attribution mask for each area parameter.
    The paper assumes Adam optimization of the INR over 4000 epochs finds masks that maintain the target class probability; no convergence guarantee is given.
  • domain assumption The Gaussian-blur perturbation I' and the RBF filter preserve the model's decision semantics, so preserving the output probability while removing other information isolates true causes.
    Inherited from Fong et al. [10]; attribution quality depends on this perturbation model.
  • ad hoc to paper A single INR with the area parameter as conditioning can represent a family of masks across a in [0,1] with smooth interpolation.
    Central to the continuity advantage; supported only qualitatively in Figure 1 and not formally or quantitatively proven.
  • standard math The soft Dice loss L_dice approximates zero overlap when masks are disjoint and one when identical, making non-overlap optimization tractable.
    Standard soft Dice from [17]; the paper uses it directly in Eq. 6.

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Cite this review

Pith. "Pith review of Generating visual explanations from deep networks using implicit neural representations." pith.science (2026). https://pith.science/paper/KJ4B4AN6

@misc{pith2026250111784,
  author       = {Pith},
  title        = {Pith review of: Generating visual explanations from deep networks using implicit neural representations},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/KJ4B4AN6}},
  note         = {Machine review of arXiv:2501.11784}
}
read the original abstract

Explaining deep learning models in a way that humans can easily understand is essential for responsible artificial intelligence applications. Attribution methods constitute an important area of explainable deep learning. The attribution problem involves finding parts of the network's input that are the most responsible for the model's output. In this work, we demonstrate that implicit neural representations (INRs) constitute a good framework for generating visual explanations. Firstly, we utilize coordinate-based implicit networks to reformulate and extend the extremal perturbations technique and generate attribution masks. Experimental results confirm the usefulness of our method. For instance, by proper conditioning of the implicit network, we obtain attribution masks that are well-behaved with respect to the imposed area constraints. Secondly, we present an iterative INR-based method that can be used to generate multiple non-overlapping attribution masks for the same image. We depict that a deep learning model may associate the image label with both the appearance of the object of interest as well as with areas and textures usually accompanying the object. Our study demonstrates that implicit networks are well-suited for the generation of attribution masks and can provide interesting insights about the performance of deep learning models.

Figures

Figures reproduced from arXiv: 2501.11784 by the authors.

Figure 1
Figure 1. A comparison between the extremal perturbations technique and the proposed attribution method based on implicit networks, [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Scheme illustrating the method proposed in this study. We used a coordinate-based implicit network to compute an attribution [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Illustration of the attribution masks generated with the proposed method. We found that an implicit network could converge [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figures from the paper (3 more)
Figure 4
Figure 4. Figure 4: Qualitative comparison of several attribution methods. [PITH_FULL_IMAGE:figures/full_fig_p007_4.png]
Figure 5
Figure 5. Figure 5: We used implicit networks to generate multiple non [PITH_FULL_IMAGE:figures/full_fig_p007_5.png]
Figure 6
Figure 6. Figure 6: The proposed technique for iterative explanation gener [PITH_FULL_IMAGE:figures/full_fig_p008_6.png]

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Pith tools

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