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arxiv: 2605.23198 · v1 · pith:IKQXU7ZInew · submitted 2026-05-22 · 💻 cs.LG

Label-Efficient Dataset Pruning via Semi-Supervised Pseudo-Labeling

Pith reviewed 2026-05-25 05:23 UTC · model grok-4.3

classification 💻 cs.LG
keywords dataset pruningsemi-supervised learningpseudo-labelingcoreset selectionlabel-efficient learningexample difficultytraining dynamics
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The pith

A small randomly labeled subset and semi-supervised pseudo-labeling lets supervised pruning methods select reliable coresets from mostly unlabeled data.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper proposes SemiPrune to perform dataset pruning when only a small fraction of data has labels. It runs semi-supervised learning on the labeled subset to assign pseudo-labels to the rest, then applies existing supervised pruning techniques that rely on training dynamics to estimate example difficulty and pick an informative coreset. This approach learns directly from the target data rather than from features of a pretrained model, which can mismatch the target distribution. The result is a label-efficient method that works on domain-specific, corrupted, and long-tailed image datasets while matching or exceeding prior label-free baselines.

Core claim

SemiPrune generates pseudo-labels for unlabeled examples by training a semi-supervised model on a small randomly chosen labeled subset, then uses the resulting pseudo-labeled pool to compute training dynamics that indicate example difficulty, and finally selects a coreset with any supervised pruning method.

What carries the argument

Pseudo-label-induced training dynamics for difficulty estimation and coreset selection after semi-supervised learning on a small labeled subset.

If this is right

  • Existing supervised pruning algorithms can now be applied directly to largely unlabeled pools without modification.
  • Pruning performance improves on datasets whose distribution differs from common pretraining data.
  • Annotation budgets can be reduced while still producing competitive coresets on standard, corrupted, and long-tailed image benchmarks.
  • Difficulty signals come from dynamics on the target distribution rather than external features.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The initial small labeled subset could itself be chosen actively rather than randomly to further improve pseudo-label quality.
  • Iterative pseudo-label refinement during the pruning process might reduce error propagation from early mistakes.
  • The same pseudo-label pipeline could be tested on non-image modalities where pretrained models are even less reliable.

Load-bearing premise

The pseudo-labels produced by semi-supervised learning on the small labeled subset are accurate enough that the resulting training dynamics reliably indicate example difficulty for coreset selection.

What would settle it

On a domain-shifted dataset, train models on coresets chosen by SemiPrune versus by a pretrained-feature baseline and check whether the SemiPrune coreset yields lower test accuracy.

Figures

Figures reproduced from arXiv: 2605.23198 by Baekrok Shin, Changmin Kang, Chulhee Yun, Yeseul Cho.

Figure 1
Figure 1. Figure 1: t-SNE visualization of Food-101 embeddings from ImageNet-pretrained DINO (a) and SSL-trained models (b). For each feature space, panels are colored by ground-truth labels. depends on whether the pretrained feature space is well aligned with the semantic structure of the target dataset. First, when the target dataset is weakly aligned with the pretraining data, deep clustering may fail to recover semantical… view at source ↗
Figure 2
Figure 2. Figure 2: Effect of the initial label budget on coreset performance. We compare our method with Score Extrapolation under identical initial label budgets and include label-free baselines for reference. We next study the effect of the initial label budget on coreset performance. Since both our method and Score Extrapolation rely on a small annotated subset, we compare them under the same label budgets. As shown in [… view at source ↗
Figure 3
Figure 3. Figure 3: t-SNE visualization of corrupted CIFAR-100 embeddings from ImageNet-pretrained DINO (a) and SSL-trained models (b). For each feature space, panels are colored by ground-truth labels. 16 [PITH_FULL_IMAGE:figures/full_fig_p016_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: t-SNE visualization of long-tailed CIFAR-100 with an imbalance factor of 0.1 embeddings from ImageNet-pretrained DINO (a) and SSL-trained models (b). For each feature space, panels are colored by ground-truth labels. (a) Embeddings from DINO (b) Embeddings from SSL-trained model [PITH_FULL_IMAGE:figures/full_fig_p017_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: t-SNE visualization of Caltech-101 embeddings from ImageNet-pretrained DINO (a) and SSL-trained models (b). For each feature space, panels are colored by ground-truth labels [PITH_FULL_IMAGE:figures/full_fig_p017_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Class-wise distribution of assigned pseudo-labels. Deep-Clustering does not distribute pseudo-label assignments evenly across classes, leaving some classes with no assigned samples at all, whereas Semi-Supervised Learning yields a relatively more balanced distribution. For corrupted samples, both DC and SSL assign a substantial portion of samples to the same class. However, SSL maintains a relatively broad… view at source ↗
Figure 7
Figure 7. Figure 7: Class-wise distribution of assigned pseudo-labels. 0 20 40 60 80 100 Class Index 0 100 200 300 400 500 Number of Samples DC Pseudo-labels Ground Truth DC 0 20 40 60 80 100 Class Index SSL Pseudo-labels Ground Truth SSL Distribution of Pseudo Labels on CIFAR-100-LT-IF0.1 [PITH_FULL_IMAGE:figures/full_fig_p019_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Class-wise distribution of assigned pseudo-labels. 19 [PITH_FULL_IMAGE:figures/full_fig_p019_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: Class-wise distribution of assigned pseudo-labels [PITH_FULL_IMAGE:figures/full_fig_p020_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: Effect of the initial label budget on coreset performance on CIFAR-100. 1% 2% 5% 10% 73.2 74.5 75.8 77.1 78.4 Accuracy 30% Pruning 1% 2% 5% 10% 61.9 65.3 68.7 72.2 75.6 50% Pruning 1% 2% 5% 10% 57.7 60.8 63.9 67.0 70.1 70% Pruning 1% 2% 5% 10% 52.0 55.4 58.8 62.3 65.7 80% Pruning 1% 2% 5% 10% 34.8 40.1 45.4 50.7 56.0 90% Pruning FOOD-101 Initial Label Budget Fully Supervised Random ELFS (DINO) ELFS (Self)… view at source ↗
Figure 11
Figure 11. Figure 11: Effect of the initial label budget on coreset performance on Food-101. C.2 Coreset Performance Comparison Under Same Annotation Budget We compare coreset performance under a fixed annotation budget on Caltech-101. Semi-AUM+Cutoff first includes the randomly labeled 10% subset used for semi-supervised learning. It then ranks the remaining pseudo-labeled examples by their Semi-AUM scores and selects additio… view at source ↗
read the original abstract

Dataset pruning reduces the storage and training costs of deep learning by selecting an informative subset from a large dataset. However, most existing pruning methods require fully labeled data, which limits their applicability in realistic settings where unlabeled data are abundant and annotation is costly. Recent label-free pruning methods address this issue, but they rely on features from pretrained models to estimate example difficulty. This dependence can be unreliable when the target dataset differs substantially from the pretraining distribution. We propose SemiPrune, a label-efficient dataset pruning framework, using only a small randomly labeled subset, that uses semi-supervised learning to generate pseudo-labels for unlabeled data, allowing existing supervised pruning methods that require label information to be seamlessly applied to the resulting pseudo-labeled training pool. We then estimate example difficulty from pseudo-label-induced training dynamics and select a coreset. By learning directly from the target dataset, our method better captures the target distribution and provides more reliable signals for difficulty estimation and coreset selection. We validate our approach on domain-specific, image-corrupted, and long-tailed datasets, where it achieves state-of-the-art performance among label-free and label-efficient baselines, while also demonstrating competitive performance on standard benchmarks.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 1 minor

Summary. The paper proposes SemiPrune, a label-efficient dataset pruning method that uses a small randomly labeled subset to train a semi-supervised model, generates pseudo-labels for the remaining data, and then applies existing supervised pruning techniques (based on training dynamics) to select a coreset. It claims this captures the target distribution better than pretrained-feature methods and achieves SOTA among label-free/label-efficient baselines on domain-specific, corrupted, and long-tailed datasets while remaining competitive on standard benchmarks.

Significance. If the central mechanism holds, the work would meaningfully extend dataset pruning to realistic low-label regimes without relying on potentially mismatched pretrained models, directly addressing annotation cost and distribution shift issues. The approach re-uses existing supervised difficulty estimators on a pseudo-labeled pool, which is a pragmatic strength if the induced dynamics remain faithful.

major comments (2)
  1. [§3 (method description)] The central claim (abstract and §3) that 'pseudo-label-induced training dynamics' reliably indicate example difficulty for coreset selection rests on an unexamined assumption: that SSL pseudo-labels from a small random labeled subset produce monotonic loss/gradient signals with respect to true difficulty. No derivation, bound, or even correlation analysis is provided showing this holds under domain shift, corruption, or long-tailed distributions, where confirmation bias in SSL is known to distort per-example losses.
  2. [§4 (experimental validation)] Experiments (presumably §4) report SOTA performance on the highlighted regimes but provide no validation of pseudo-label accuracy, no ablations on labeled-subset size, and no comparison of difficulty rankings before/after pseudo-labeling. Without these, it is impossible to attribute gains to the proposed mechanism rather than incidental factors.
minor comments (1)
  1. [§3] Notation for the semi-supervised component and the difficulty estimator should be introduced with explicit equations rather than prose descriptions to allow reproducibility.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive feedback. We address the two major comments point-by-point below and will revise the manuscript accordingly to strengthen the presentation of the method and experiments.

read point-by-point responses
  1. Referee: [§3 (method description)] The central claim (abstract and §3) that 'pseudo-label-induced training dynamics' reliably indicate example difficulty for coreset selection rests on an unexamined assumption: that SSL pseudo-labels from a small random labeled subset produce monotonic loss/gradient signals with respect to true difficulty. No derivation, bound, or even correlation analysis is provided showing this holds under domain shift, corruption, or long-tailed distributions, where confirmation bias in SSL is known to distort per-example losses.

    Authors: We agree that the current manuscript provides no theoretical derivation or bound and does not include an explicit correlation analysis between pseudo-label-induced difficulty scores and ground-truth difficulty scores. The empirical results on domain-specific, corrupted, and long-tailed data offer indirect support for the mechanism, but this is insufficient to fully address the concern. In the revision we will add a correlation study (using the small labeled subset where ground-truth labels are available) to quantify how well pseudo-label dynamics preserve difficulty rankings. revision: yes

  2. Referee: [§4 (experimental validation)] Experiments (presumably §4) report SOTA performance on the highlighted regimes but provide no validation of pseudo-label accuracy, no ablations on labeled-subset size, and no comparison of difficulty rankings before/after pseudo-labeling. Without these, it is impossible to attribute gains to the proposed mechanism rather than incidental factors.

    Authors: We acknowledge that the submitted manuscript omits direct validation of pseudo-label accuracy, ablations over labeled-subset size, and before/after comparisons of difficulty rankings. These additions are feasible and will be included in the revised version to better isolate the contribution of the pseudo-labeling step. We will report pseudo-label accuracy on held-out labeled data, vary the labeled fraction from 1% to 10%, and show rank correlations of difficulty scores computed with versus without pseudo-labels. revision: yes

Circularity Check

0 steps flagged

No significant circularity; method is self-contained empirical proposal

full rationale

The paper proposes SemiPrune as a practical framework that applies existing supervised pruning techniques to a pseudo-labeled pool generated via standard SSL on a small labeled subset. No equations, derivations, or parameter-fitting steps are described in the provided text that reduce a claimed prediction or result to its own inputs by construction. The central claim rests on the empirical performance of reusing off-the-shelf difficulty estimators on the SSL output rather than on any self-referential mathematical identity or load-bearing self-citation chain. This is the most common honest finding for applied method papers without internal derivations.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

The method rests on the effectiveness of semi-supervised learning for generating usable pseudo-labels and the assumption that pseudo-label-induced dynamics reflect true example difficulty on the target distribution.

free parameters (1)
  • fraction of randomly labeled data
    The size of the initial labeled subset is a key design choice that affects pseudo-label quality and overall performance.
axioms (1)
  • domain assumption Semi-supervised learning produces pseudo-labels sufficiently accurate for downstream difficulty estimation on the target dataset
    This premise is required for the pseudo-labels to enable reliable coreset selection.

pith-pipeline@v0.9.0 · 5742 in / 1199 out tokens · 20883 ms · 2026-05-25T05:23:20.627483+00:00 · methodology

discussion (0)

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Reference graph

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