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REVIEW 4 major objections 5 minor 67 references

UD-Mamba: A pixel-level uncertainty-driven Mamba model for medical image segmentation

T0 review · 4 major / 5 minor · reviewed 2026-08-09 · deepseek-v4-flash

Pith's one-line read UD-Mamba redefines Mamba's pixel scan order using per-pixel channel uncertainty, reporting higher Dice and IoU than Mamba-UNet and Swin-UMamba on pathology, skin-lesion, and cardiac MRI datasets while using fewer FLOPs.

desk verdict Readable incremental Mamba segmentation paper with a promising uncertainty-sorting idea, but the core mechanism is never isolated and the ablation has internal contradictions. read the letter →

arxiv 2502.02024 v1 pith:TIADQT66 submitted 2025-02-04 eess.IV cs.CV

classification eess.IVcs.CV
keywords medicalimagesegmentationMambastatespacemodelsuncertainty-drivenscanningpixel-leveluncertaintyselectivechannelDicescore
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

UD-Mamba claims that the order in which a Mamba state-space model scans image pixels can be driven by pixel-level channel uncertainty rather than by fixed spatial location. For each spatial position it computes the standard deviation across feature channels, sorts the feature map so high-uncertainty pixels (foreground and boundaries) come first, and then applies two scanning patterns, sequential and skip, in both high-to-low and low-to-high directions. Four learned scalars reweight the four scans, and a cosine consistency loss aligns features from opposite directions. On DigestPath, ISIC 2018, and ACDC, the resulting model reports higher Dice and IoU than Mamba-UNet and Swin-UMamba while using fewer FLOPs. The paper's argument matters because it suggests a cheap, parameter-light way to make long-range sequence models attend to diagnostically important pixels.

What carries the argument

The load-bearing object is UD-SSM, an Uncertainty-Driven Selective Scanning Module. It computes a per-pixel uncertainty map $U_{h,w} = \sqrt{\frac{1}{C}\sum_c (X_{c,h,w}-\mu_{h,w})^2}$ as the standard deviation across channels, sorts the feature map by $U$, and then performs four scans: sequential and skip, each in high-to-low and low-to-high order. Four learnable parameters $\alpha_1,\dots,\alpha_4$ reweight the four scan outputs before the S6 selective state-space block, and a recovery step restores spatial positions. A cosine consistency loss $L_{cos}$ then aligns the forward and backward scan features. This machinery is what replaces the fixed location-based scanning of prior Mamba vision models.

What would settle it

Train the full UD-Mamba pipeline on the same datasets but replace the uncertainty-sorted order with a random permutation while keeping the four scans, reweighting, and cosine loss; if the Dice score does not drop relative to the uncertainty-sorted model, then the uncertainty ordering is not what drives the reported gains.

Watch

Extended reading notes

Core claim

The central discovery is that reordering a Mamba scan by channel uncertainty, specifically by the standard deviation of each pixel's feature vector across channels, improves medical image segmentation over location-based scanning. The authors treat the channel-standard-deviation map as an uncertainty map in which high uncertainty marks boundaries and foreground objects and low uncertainty marks background. Sorting by this map and scanning the sorted sequence lets the selective state-space model process critical regions contiguously, while skip scanning at fixed uncertainty intervals mixes background context into the foreground-dense sequence. The reported gains, Dice of 80.89 on DigestPath, 89.15 on ISIC 2018, and 91.99 on ACDC with HD95 of 1.31 mm on ACDC, are attributed to this uncertainty-driven ordering together with the four-scan reweighting and the cosine consistency loss.

Load-bearing premise

The load-bearing premise is that a pixel's standard deviation across feature channels marks the pixels that matter for segmentation, namely boundaries and foreground, so sorting by it makes the scan more useful; the paper tests the complete pipeline, not this correlation directly.

Editorial extensions

If this is right

  • If the ordering is the cause of the gains, any sequence-model architecture that processes pixels in a one-dimensional order can adopt the same uncertainty-sorted scan without changing its parameters or loss.
  • Pixel-level uncertainty granularity is preferable to region-based blocks: the paper's ablation reports that $1\times1$ uncertainty blocks outperform $2\times2$, $4\times4$, and $8\times8$ blocks on DigestPath.
  • Standard deviation is a better uncertainty estimator than mean absolute deviation, variance, entropy, or range for this purpose, according to the paper's ablation on DigestPath.
  • The four-scan ensemble with reweighting and cosine consistency adds value beyond any single scan direction, since combining all four scans raises DSC from 78.15 (vanilla position-based) to 80.32 and the final pipeline to 80.89.
  • The model's computational advantage, 19.12M parameters and 5.91G FLOPs on ACDC, below all compared transformer and Mamba baselines, makes the approach practical for high-resolution medical images.

Reading between the lines

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

  • The paper does not show that the channel-standard-deviation map correlates with ground-truth boundaries, so the reordering's unique contribution is untested on its own; a random-order control would isolate it from the gains of the four-scan ensemble.
  • The same uncertainty map could serve as a cheap boundary-emphasis signal outside Mamba, for example as an auxiliary supervision target or an attention prior in CNN and transformer segmentation heads.
  • Because the four directional scans are reweighted by learned scalars, the method may be robust to the direction choice; the observed smaller decay of $\alpha_3$ and $\alpha_4$ hints that the low-to-high scans carry more weight, but this is a post-hoc observation from Figure 6, not a tested claim.
  • A natural extension is to apply UD-SSM to 3D medical volumes by treating slices or patches as the scan sequence, though the paper only reports 2D experiments.
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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 / 5 minor

Summary. The paper proposes UD-Mamba, a U-Net-like Mamba architecture for medical image segmentation in which the pixel scan order is determined by a per-pixel uncertainty score, defined as the standard deviation across feature channels (Eq. 4). The feature map is reordered in descending uncertainty (Eqs. 5-6) and processed by four scanning streams: sequential and skip scans in both high-to-low and low-to-high uncertainty directions (Eqs. 7-10), reweighted by four learnable scalars, plus a cosine consistency loss between opposite directions. Experiments on DigestPath, ISIC 2018, and ACDC report DSC values of 80.89, 89.15, and 91.99, respectively, outperforming the compared Mamba baselines with lower FLOPs. The paper also ablates the scanning components, the uncertainty metric, and the uncertainty region size.

Significance. The core idea of using an information-density or uncertainty criterion to define Mamba's scan order, rather than a fixed spatial raster, is a reasonable and potentially useful direction for selective state-space models in dense prediction, and the reported computational efficiency (19.12M parameters, 5.91G FLOPs on ACDC) is attractive. The manuscript is generally clearly written, gives the architecture and losses in sufficient detail, and provides code. If the mechanism were properly isolated, the work could be a useful contribution to the Mamba-for-medical-imaging literature. As it stands, however, the evidence does not show that the channel-standard-deviation ordering is what produces the gains; the individual ablation rows in Table 4 in fact suggest that uncertainty ordering alone hurts performance, and the authors' own conclusion in Section 5 states that performance depends heavily on accurate channel uncertainty estimation. The central mechanistic claim therefore needs substantially stronger experimental support.

major comments (4)
  1. [§4.4, Table 4 and Eqs. (4)-(6)] The paper's central claim is that sorting pixels by channel standard deviation places boundaries and foreground before background and that this reordering drives the reported gains. The experiments never isolate this mechanism. Compared with the position-scanning baseline (first row of Table 4, DSC 78.15), the full model changes the scan order, replaces the single bidirectional location scan with four uncertainty-ordered scans, adds four learnable reweighting scalars, and adds a cosine consistency loss. Please add controls that keep everything else fixed while varying only the ordering rule: a random permutation, an anti-correlated permutation, and an oracle ordering based on the ground-truth boundary map, and also compare a single uncertainty-ordered scan against a single bidirectional location scan. Without these controls, the observed improvement cannot be attributed to Eq. 4.
  2. [Table 4, rows 2-5] The individual uncertainty-ordered components underperform the vanilla baseline: y1 alone gives DSC 75.67 and y2 alone gives 76.87, both below 78.15; even y1+y3 (76.27) and y2+y4 (77.90) are below the baseline. Only the four-way sum (80.32) exceeds it. This pattern is in tension with the claim that prioritizing high-uncertainty pixels improves segmentation precision, and it points instead to the four-scan ensemble as the source of the gain. Please analyze the contribution of each factor and report the performance of each scan direction with the same reweighting and consistency mechanisms applied.
  3. [§4.4, 'Analysis for re-weighting values', Fig. 6, and Eqs. (7)-(10), (14)] The text says alpha3 and alpha4 correspond to scanning from high to low uncertainty, but Eqs. (7)-(10) define y1/y2 as high-to-low and y3/y4 as low-to-high. The surrounding text is also inconsistent about which direction is preferable: Section 3.3 says the method enhances the advantages of low-to-high uncertainty scanning (before Eq. 11), Fig. 2's caption says ascending (low-to-high) outperforms descending, and the conclusion in Section 5 says low-to-high typically yields greater benefits than the reverse, while the re-weighting analysis claims high-to-low contributes more. Please correct the labels and provide a consistent, quantitative account of the directionality result.
  4. [Tables 1, 2, 4, and 5] All results are point estimates without standard deviations, confidence intervals, or significance tests. The reported differences over the strongest baselines are small (e.g., 0.91% DSC on ACDC in Table 2), so run-to-run variance is a real concern. In addition, the choice of STD as the uncertainty metric in Table 5 is made by comparing alternatives on the same test sets used for the headline results; this is a form of test-set selection. Please report mean ± std over multiple seeds and choose the uncertainty metric on a validation split.
minor comments (5)
  1. [Table 4, y2 row] The ACC value is listed as 64.67, which is far outside the plausible range and inconsistent with the other rows; this is likely a typo for 94.67.
  2. [Eq. (14)] The expression '1− cos_sim(yr1, yr3) +cos_sim(yr2, yr4) 2' is mathematically ambiguous; it should be written as 1 - (cos_sim(y1,y3) + cos_sim(y2,y4)) / 2.
  3. [Table 5] The label 'Entroph' should be 'Entropy', and 'Range between the two highest values' should be defined precisely (e.g., max - min or the difference between the two largest channel activations).
  4. [§3.3, Skip scanning] The description of skip scanning as moving vertically across the image at consistent uncertainty intervals is vague; please specify whether the intervals are in sorted-index space or in pixel coordinates and how the fixed intervals are chosen.
  5. [Figure 2] Figure 2 reports no numeric values or error bars, so the claimed advantage of ascending over descending scanning cannot be assessed from the figure alone; please provide the underlying numbers or refer to Table 4 more precisely.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the paper's claims are empirical segmentation results, not derivations that reduce to their inputs.

full rationale

UD-Mamba is an empirical computer-vision paper: its central claim is that pixel-level channel standard deviation (Eq. 4), used as a sorting key (Eq. 5), improves Mamba-based segmentation, and this is supported by measured Dice scores on three benchmarks rather than by a formal derivation. The load-bearing assumption that higher channel standard deviation 'typically corresponds to key regions, such as object boundaries or foreground regions' is stated as an observation, not derived from the definition of standard deviation, so it is not circular; it is an empirical premise that could be false. The four learnable reweighting parameters and the cosine consistency loss are trained and evaluated under standard supervision, and the paper does not relabel any fitted value as a prediction. The self-citations (e.g., Ref. 52 with overlapping authors, Ref. 61 by a co-author) appear only as background related-work references and are not load-bearing for the main architecture or results. The absence of controls such as random or oracle orderings in the ablation study (Table 5) weakens causal attribution but is a question of experimental design and correctness risk, not circularity. The internal inconsistency in Section 4.4 regarding which alpha values correspond to high-to-low versus low-to-high scanning is an error in interpretation, not a circular argument. The paper's conclusions are therefore self-contained in the sense that they report measured performance rather than deriving a result from its own assumptions.

Assumptions & free parameters 4 free parameters · 5 assumptions · 0 invented entities

The central claim rests on a small set of modeling choices: channel standard deviation as the uncertainty signal, uncertainty-based pixel reordering, four scan paths, learnable scan weights, and a cosine consistency loss. The main unvalidated premise is that channel variance marks segmentation-relevant pixels. No new physical entities are introduced. The scan weights and loss weight are learned or hand-set, and the uncertainty metric was selected by ablation on the evaluation benchmark.

free parameters (4)
  • alpha_1 through alpha_4 (learnable scan weights) = learned during training; Figure 6 shows all four decreasing over time
    Four scalar multipliers combine the four scan sequences in Eq. 11; their learned values are part of the method and are dataset-dependent.
  • lambda (consistency loss weight) = 0.3
    Hand-set hyperparameter balancing the supervised loss and the cosine consistency loss in Eq. 15.
  • Uncertainty metric choice = standard deviation (STD)
    Selected after comparing MAD, range, entropy, and variance on DigestPath (Table 5); the best metric on the evaluation benchmark was adopted, making this a model-selection step.
  • Skip scanning interval = not specified
    The paper describes skip scanning as sampling at fixed intervals but never states the interval value, leaving an undocumented implementation choice that affects the method's behavior.
assumptions (5)
  • standard math Mamba's S6 selective scan provides linear-complexity long-range dependency modeling.
    Assumed from prior work [14]; the paper builds UD-SSM on top of this foundation.
  • domain assumption Channel standard deviation at a spatial position identifies foreground, boundary, and otherwise segmentation-critical pixels.
    This is the load-bearing premise of Eqs. 4 to 6 and Figure 1; the paper provides no direct validation beyond final segmentation metrics.
  • domain assumption Sorting and rearranging pixels by uncertainty, then recovering spatial positions, preserves the information needed for segmentation.
    Required for the Rearrange operation in Eq. 6 and the Recover operation in Eq. 12; residual connections may compensate, but the paper does not analyze this.
  • domain assumption The benchmark ground-truth labels are correct and representative.
    Standard public datasets are used for training and evaluation; no label-quality analysis is provided.
  • ad hoc to paper Cosine similarity between opposite scanning directions is a useful consistency objective.
    Introduced to align forward and backward scans; the only supporting evidence is the Table 4 ablation row with and without Lcos.

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Cite this review

Pith. "Pith review of UD-Mamba: A pixel-level uncertainty-driven Mamba model for medical image segmentation." pith.science (2026). https://pith.science/paper/TIADQT66

@misc{pith2026250202024,
  author       = {Pith},
  title        = {Pith review of: UD-Mamba: A pixel-level uncertainty-driven Mamba model for medical image segmentation},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/TIADQT66}},
  note         = {Machine review of arXiv:2502.02024}
}
read the original abstract

Recent advancements have highlighted the Mamba framework, a state-space model known for its efficiency in capturing long-range dependencies with linear computational complexity. While Mamba has shown competitive performance in medical image segmentation, it encounters difficulties in modeling local features due to the sporadic nature of traditional location-based scanning methods and the complex, ambiguous boundaries often present in medical images. To overcome these challenges, we propose Uncertainty-Driven Mamba (UD-Mamba), which redefines the pixel-order scanning process by incorporating channel uncertainty into the scanning mechanism. UD-Mamba introduces two key scanning techniques: 1) sequential scanning, which prioritizes regions with high uncertainty by scanning in a row-by-row fashion, and 2) skip scanning, which processes columns vertically, moving from high-to-low or low-to-high uncertainty at fixed intervals. Sequential scanning efficiently clusters high-uncertainty regions, such as boundaries and foreground objects, to improve segmentation precision, while skip scanning enhances the interaction between background and foreground regions, allowing for timely integration of background information to support more accurate foreground inference. Recognizing the advantages of scanning from certain to uncertain areas, we introduce four learnable parameters to balance the importance of features extracted from different scanning methods. Additionally, a cosine consistency loss is employed to mitigate the drawbacks of transitioning between uncertain and certain regions during the scanning process. Our method demonstrates robust segmentation performance, validated across three distinct medical imaging datasets involving pathology, dermatological lesions, and cardiac tasks.

Figures

Figures reproduced from arXiv: 2502.02024 by the authors.

Figure 1
Figure 1. Pixel-level channel uncertainty-based scanning mechanism. (a) Input im [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 3
Figure 3. Illustration of the UD-Mamba ar￾chitecture, which includes a patch em￾bedding layer, an encoder-decoder with Uncertainty-Driven (UD) Blocks, and a segmentation head. Each UD Block fea￾tures the Uncertainty-Driven Selective Scanning Model (UD-SSM) for process￾ing input. on imaging methods such as CT [65,64,49,13] and MRI [23,57]. Among them, Convolutional Neural Networks (CNNs) and Transformers dominate as leading fr… view at source ↗
Figure 4
Figure 4. Detailed description of the UD-SSM. I. Describes the uncertainty calcu [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figures from the paper (2 more)
Figure 5
Figure 5. Figure 5: Visual comparisons of segmentation results from UD-Mamba and various [PITH_FULL_IMAGE:figures/full_fig_p012_5.png]
Figure 6
Figure 6. Figure 6: Analysis of recorded values for four learnable reweighting parameters. [PITH_FULL_IMAGE:figures/full_fig_p015_6.png]

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Pith tools

Reviewed August 9, 2026 · model on record in the stance chip above.