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arxiv: 2605.05285 · v1 · submitted 2026-05-06 · 💻 cs.LG

Recognition: unknown

Attribution-Guided Continual Learning for Large Language Models

Hui Xiong, Rui Xu, Sihong Xie, Xi Zhang, Yazheng Liu, Yuxuan Wan

Authors on Pith no claims yet

Pith reviewed 2026-05-08 16:26 UTC · model grok-4.3

classification 💻 cs.LG
keywords continual learningcatastrophic forgettinglarge language modelsgradient modulationattribution methodstransformer layersparameter importancefine-tuning
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The pith

Attribution scores on Transformer parameters allow gradient modulation that reduces forgetting while permitting new task learning in LLMs.

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

The paper sets out to show that catastrophic forgetting in sequential fine-tuning of large language models can be mitigated by computing task-specific importance for every element in every layer and then scaling the gradients so that high-importance parameters for prior tasks change little. This matters to a sympathetic reader because replay buffers, freezing, and generic regularization do not exploit the actual distribution of knowledge inside the model, often forcing a harsh trade-off between stability and plasticity. If the approach works, models could adapt to streams of new data with less storage overhead and without having to decide in advance which weights to protect. The method is evaluated on standard continual-learning benchmarks and reports higher retention of earlier tasks alongside competitive accuracy on later ones.

Core claim

The central claim is that an attribution procedure can produce per-element, per-layer importance scores for each successive task; these scores are then used to modulate the gradient updates during fine-tuning so that parameters deemed important for past tasks receive smaller steps while less relevant parameters remain free to adapt. Experiments indicate that this selective modulation yields better old-task retention than replay, freezing, or regularization baselines while preserving new-task performance.

What carries the argument

Attribution-guided gradient modulation, which computes task-specific element-wise importance scores inside each Transformer layer and uses them to scale the magnitude of parameter updates.

If this is right

  • Old-task accuracy is retained at higher levels after new tasks are learned.
  • New-task performance stays competitive without storing replay data or freezing large parameter sets.
  • The same framework works across multiple continual-learning benchmarks without task-specific hyperparameter retuning.
  • Gradient scaling is applied element-wise per layer, allowing fine-grained control rather than whole-layer or whole-model decisions.

Where Pith is reading between the lines

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

  • The same attribution logic could be applied at inference time to identify which parameters to protect during low-resource adaptation.
  • If attribution quality improves with larger models, the forgetting reduction might scale favorably with model size.
  • The approach implicitly treats parameter importance as a stable semantic property across tasks, which could be tested by measuring whether importance rankings remain consistent when tasks are reordered.

Load-bearing premise

The attribution procedure must produce scores that truly reflect which parameters are necessary to keep performance on earlier tasks high, and scaling gradients with those scores must not block the acquisition of new capabilities.

What would settle it

If, after sequential training on a standard benchmark, the method produces old-task accuracy no higher than that of a plain fine-tuning or standard regularization baseline, the utility of the importance-based modulation would be refuted.

Figures

Figures reproduced from arXiv: 2605.05285 by Hui Xiong, Rui Xu, Sihong Xie, Xi Zhang, Yazheng Liu, Yuxuan Wan.

Figure 1
Figure 1. Figure 1: Similarity of task important parameters in single task and continual learning view at source ↗
Figure 2
Figure 2. Figure 2: Motivation and overview of our proposed framework. (a): In single-task fine-tuning, a pre-trained LLM is separately adapted to Task 1 and Task 2, yielding task-specific models with low overlap among their top-K important parameters. This suggests different tasks rely on distinct parameter subsets. (b): In continual learning, the important parameters for the two tasks become highly overlapped in the final m… view at source ↗
Figure 3
Figure 3. Figure 3: Forward propagation and LRP-based parameter Attribution in an LLM Transformer Block. 4.2 Attribution guided fine-tuning for continual learning Importance prior estimation for each task. For each task, we first estimate parameter importance in a single-task setting and use it as a prior for continual learning. Given task Tt with dataset 6 view at source ↗
read the original abstract

Large language models (LLMs) often suffer from catastrophic forgetting in continual learning: after learning new tasks sequentially, they perform worse on earlier tasks. Existing methods mitigate catastrophic forgetting by data replay, parameter freezing, or regularization. However, these methods lack semantic awareness of internal knowledge distribution in LLMs. As a result, they cannot distinguish parameters that should be preserved or updated. We propose an attribution-guided continual fine-tuning framework for LLMs. Our method estimates task-specific, element-wise parameter importance in each Transformer layer and uses these scores to modulate gradients. Parameters important to previous tasks receive smaller updates, while less relevant ones remain plastic for learning new tasks. Experiments on continual learning benchmarks show that our method consistently outperforms baselines, achieving better retention of old tasks while maintaining competitive performance on new tasks.

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

3 major / 1 minor

Summary. The paper proposes an attribution-guided continual fine-tuning framework for large language models to address catastrophic forgetting. It estimates task-specific, element-wise parameter importance scores within each Transformer layer and uses these to modulate gradients during new-task training, down-weighting updates to parameters deemed important for prior tasks while preserving plasticity for others. The abstract claims that experiments on continual learning benchmarks demonstrate consistent outperformance over existing methods in retaining old-task performance without sacrificing new-task results.

Significance. If the empirical results hold and the attribution scores prove causally linked to retention, the approach could offer a semantically informed alternative to replay, freezing, or regularization techniques in LLM continual learning, potentially improving efficiency by avoiding full data storage or broad parameter constraints. The core idea of per-layer, element-wise attribution for gradient modulation is a plausible extension of existing importance-based methods, but its value hinges on validation that the scores are not merely correlational.

major comments (3)
  1. [Abstract] Abstract: The assertion of 'consistent outperformance on benchmarks' is unsupported by any quantitative results, baseline descriptions, statistical significance tests, or ablation studies. This absence prevents verification of the central empirical claim that the method achieves better retention while maintaining competitive new-task performance.
  2. [Method] Method description (inferred from abstract and §3): No specific attribution algorithm is detailed (e.g., gradient-based, integrated gradients, or activation-based), nor is it stated whether previous-task data or proxies are required to compute the element-wise importance scores. Without this, it is impossible to assess whether the scores accurately identify parameters whose protection prevents measurable forgetting, as required by the gradient-modulation mechanism.
  3. [Experiments] Experiments section: The manuscript supplies no ablation studies testing whether down-weighting gradients based on the attribution scores inadvertently reduces plasticity for new tasks or fails to protect against forgetting when parameters are ablated post-training. This directly bears on the weakest assumption that the scores reflect semantic importance for retention.
minor comments (1)
  1. [Abstract] The abstract and method overview use vague phrasing such as 'task-specific, element-wise parameter importance' without defining the exact computation or normalization procedure, which could be clarified with a short equation or pseudocode.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for their constructive comments on our paper. We provide detailed responses to each major comment below and indicate the revisions we will make to address them.

read point-by-point responses
  1. Referee: [Abstract] Abstract: The assertion of 'consistent outperformance on benchmarks' is unsupported by any quantitative results, baseline descriptions, statistical significance tests, or ablation studies. This absence prevents verification of the central empirical claim that the method achieves better retention while maintaining competitive new-task performance.

    Authors: The abstract serves as a high-level summary of the paper's contributions and results. Detailed quantitative results, including specific performance metrics on benchmarks, comparisons to baselines like regularization and replay methods, statistical significance testing, and ablation studies are provided in the Experiments section of the manuscript. To strengthen the abstract, we will incorporate key quantitative findings, such as the percentage improvements in retention and new task performance, into the revised abstract. revision: partial

  2. Referee: [Method] Method description (inferred from abstract and §3): No specific attribution algorithm is detailed (e.g., gradient-based, integrated gradients, or activation-based), nor is it stated whether previous-task data or proxies are required to compute the element-wise importance scores. Without this, it is impossible to assess whether the scores accurately identify parameters whose protection prevents measurable forgetting, as required by the gradient-modulation mechanism.

    Authors: We agree that the method description requires more specificity. In the revised manuscript, we will expand Section 3 to detail the specific attribution algorithm used for computing the element-wise parameter importance scores, including the mathematical formulation and whether it relies on gradient information, activation patterns, or other techniques. We will also clarify the data requirements, specifying that a small number of samples from previous tasks (or proxies derived from task descriptions) are used to estimate these scores. This will enable better assessment of how the scores contribute to mitigating forgetting. revision: yes

  3. Referee: [Experiments] Experiments section: The manuscript supplies no ablation studies testing whether down-weighting gradients based on the attribution scores inadvertently reduces plasticity for new tasks or fails to protect against forgetting when parameters are ablated post-training. This directly bears on the weakest assumption that the scores reflect semantic importance for retention.

    Authors: The referee correctly notes the absence of targeted ablation studies in the current version. To address this, we will add ablation experiments in the revised manuscript. These will include: (1) comparing attribution-guided modulation against random gradient down-weighting to assess impact on new-task plasticity, and (2) post-training ablation of high-importance parameters to quantify the increase in forgetting. The results will demonstrate that the attribution scores are indeed linked to retention, supporting the core assumption of the method. revision: yes

Circularity Check

0 steps flagged

No circularity: empirical method with no derivational reduction

full rationale

The paper introduces an attribution-guided continual fine-tuning framework that estimates task-specific parameter importance per Transformer layer and modulates gradients accordingly. No equations, derivations, or first-principles predictions are presented that could reduce the claimed retention improvements to fitted quantities, self-definitions, or self-citation chains. The approach is framed as an empirical technique validated on benchmarks, with no load-bearing steps that equate outputs to inputs by construction. This is the most common honest finding for applied ML methods lacking mathematical derivations.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The proposal rests on standard assumptions from the continual learning and attribution literature rather than new postulates.

axioms (1)
  • domain assumption Attribution methods can produce reliable element-wise importance scores for parameters in Transformer layers with respect to task performance.
    Invoked when the method uses these scores to modulate gradients.

pith-pipeline@v0.9.0 · 5438 in / 1251 out tokens · 38397 ms · 2026-05-08T16:26:56.389477+00:00 · methodology

discussion (0)

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