Recognition: 2 theorem links
· Lean TheoremAre Candidate Models Really Needed for Active Learning?
Pith reviewed 2026-05-15 05:15 UTC · model grok-4.3
The pith
Randomly initialized CNNs and transformers can guide active learning sample selection without any initial candidate models.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
CNNs and transformers with randomly initialized weights produce confidence scores that are informative enough to select which samples to label next; low-confidence sampling among these scores yields final model performance comparable to conventional active-learning methods that first train a candidate model on an initial labeled pool.
What carries the argument
Confidence-based sampling (high-confidence, low-confidence, and hybrid HCLC) applied directly to the softmax outputs of randomly initialized CNNs and transformers.
If this is right
- Active learning pipelines can begin without any preliminary training round.
- Low-confidence sampling alone suffices as the selection rule for the entire labeling process.
- Both convolutional and transformer architectures support the random-initialization approach.
- Total wall-clock time for active learning drops because the candidate-model training step disappears.
- The method applies across standard computer-vision benchmarks without architecture-specific tuning.
Where Pith is reading between the lines
- The same random-init confidence signal might work for non-vision tasks where pre-training is expensive.
- If low-confidence selection succeeds early, it could reduce the total number of labeling rounds needed.
- The approach invites direct comparison with uncertainty methods that do require pre-training to see where the random-init shortcut breaks.
- Resource-limited settings could adopt active learning immediately without waiting for a strong base model.
Load-bearing premise
The assumption that the raw confidence numbers coming from a network with random weights actually point to the most useful samples to label.
What would settle it
Run the same labeling budget with uniform random selection instead of low-confidence selection from random-init models; if the final test accuracy is statistically identical, the claim is falsified.
Figures
read the original abstract
Deep learning has profoundly impacted domains such as computer vision and natural language processing by uncovering complex patterns in vast datasets. However, the reliance on extensive labeled data poses significant challenges, including resource constraints and annotation errors, particularly in training Convolutional Neural Networks (CNNs) and transformers due to a larger number of parameters. Active learning offers a promising solution to reduce labeling burdens by strategically selecting the most informative samples for annotation. However, the current active learning frameworks are time-intensive which select the samples iteratively with the help of initial candidate models. This study investigates the feasibility of using CNNs and transformers with randomly initialized weights, eliminating the need for initial candidate models while achieving results comparable to active learning frameworks that depend on such candidate models. We evaluate three confidence-based sampling strategies: high confidence (HC), low confidence (LC), and a combination of high confidence in the early stages of training and low confidence at later stages of training (HCLC). Among these, mostly LC demonstrated the best performance in our experiments, showcasing its effectiveness as an active learning strategy without the need for candidate models. Further, extensive experiments verify the robustness of the proposed active learning methods. By challenging traditional frameworks, the proposed work introduces a streamlined approach to active learning, advancing efficiency and flexibility across diverse datasets and domains.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper claims that active learning for CNNs and transformers can be performed effectively using randomly initialized weights, without any initial candidate models, by applying confidence-based sampling strategies (high confidence HC, low confidence LC, and hybrid HCLC). It asserts that LC yields the best performance among these and achieves results comparable to traditional AL frameworks that rely on pre-trained or candidate models, with extensive experiments verifying robustness across datasets.
Significance. If the central empirical claim holds with proper controls, the work would offer a meaningful simplification of active learning pipelines by removing the need for candidate model training, potentially improving efficiency in resource-constrained settings. However, the significance is limited by the absence of clear quantitative evidence in the provided abstract and the unresolved question of whether random-initialization confidence scores carry genuine informativeness beyond random selection.
major comments (2)
- [Experiments] Experiments section: the central claim that LC selection with random-init models outperforms or matches traditional AL requires a random-sampling baseline; without it, any reported gains could be consistent with the null that the ordering induced by untrained softmax outputs is uncorrelated with true informativeness, reducing the method to non-adaptive ranking.
- [Results] Results and evaluation: the abstract states 'comparable results' and 'best performance' for LC but provides no numerical metrics, dataset sizes, number of runs, or statistical significance tests; these details are load-bearing for the claim that random-init AL eliminates the need for candidate models.
minor comments (1)
- [Method] Clarify the precise definition of 'randomly initialized weights' (e.g., whether any pre-training on unrelated data is used) and how the final model is trained after selection.
Simulated Author's Rebuttal
We thank the referee for the constructive feedback. We address the major comments point by point below, agreeing where revisions are needed to strengthen the empirical claims.
read point-by-point responses
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Referee: Experiments section: the central claim that LC selection with random-init models outperforms or matches traditional AL requires a random-sampling baseline; without it, any reported gains could be consistent with the null that the ordering induced by untrained softmax outputs is uncorrelated with true informativeness, reducing the method to non-adaptive ranking.
Authors: We agree that a random-sampling baseline is required to establish that the confidence-based ordering is informative rather than equivalent to random selection. In the revised manuscript we will add random sampling as an explicit baseline in all experiments, reporting accuracy curves and final performance deltas versus LC (and HC/HCLC) on every dataset. This will allow direct verification that the untrained softmax scores induce a non-random ranking correlated with true informativeness. revision: yes
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Referee: Results and evaluation: the abstract states 'comparable results' and 'best performance' for LC but provides no numerical metrics, dataset sizes, number of runs, or statistical significance tests; these details are load-bearing for the claim that random-init AL eliminates the need for candidate models.
Authors: We will revise the abstract to include concrete numerical results (e.g., final accuracies or AUCs for LC versus traditional candidate-model AL and versus random sampling), dataset sizes, number of independent runs, and a statement that statistical significance was assessed via paired t-tests or Wilcoxon tests. The full tables and significance values already appear in the experiments section; the abstract update will make these load-bearing details immediately visible while preserving brevity. revision: yes
Circularity Check
No circularity: purely empirical comparison with no derivation chain
full rationale
The paper conducts an experimental study evaluating confidence-based active learning strategies (HC, LC, HCLC) on randomly initialized CNNs and transformers across datasets. No mathematical derivations, uniqueness theorems, fitted parameters renamed as predictions, or self-citation load-bearing steps appear in the provided text. All claims rest on direct empirical comparisons to baselines, with no reduction of results to inputs by construction. The approach is self-contained as a standard empirical ablation.
Axiom & Free-Parameter Ledger
axioms (1)
- domain assumption Confidence estimates from randomly initialized neural networks are informative enough for active learning sample selection.
Lean theorems connected to this paper
-
IndisputableMonolith/Cost/FunctionalEquation.leanwashburn_uniqueness_aczel unclear?
unclearRelation between the paper passage and the cited Recognition theorem.
This study investigates the feasibility of using CNNs and transformers with randomly initialized weights, eliminating the need for initial candidate models while achieving results comparable to active learning frameworks that depend on such candidate models. We evaluate three confidence-based sampling strategies: high confidence (HC), low confidence (LC), and a combination... mostly LC demonstrated the best performance
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IndisputableMonolith/Foundation/RealityFromDistinction.leanreality_from_one_distinction unclear?
unclearRelation between the paper passage and the cited Recognition theorem.
The Lottery Ticket Hypothesis... randomly initialized neural networks there exist sub-networks... capable of achieving comparable performance
What do these tags mean?
- matches
- The paper's claim is directly supported by a theorem in the formal canon.
- supports
- The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
- extends
- The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
- uses
- The paper appears to rely on the theorem as machinery.
- contradicts
- The paper's claim conflicts with a theorem or certificate in the canon.
- unclear
- Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.
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