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arxiv: 2601.09512 · v2 · pith:OFGGA7DHnew · submitted 2026-01-14 · 💻 cs.RO · cs.LG

CLARE: Continual Learning for Vision-Language-Action Models via Autonomous Adapter Routing and Expansion

Pith reviewed 2026-05-21 15:48 UTC · model grok-4.3

classification 💻 cs.RO cs.LG
keywords continual learningvision-language-action modelsadapter routingrobot manipulationexemplar-freecatastrophic forgettingtask routing
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The pith

CLARE lets pre-trained vision-language-action models learn new robot tasks without forgetting old ones or needing stored examples.

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

The authors aim to create a way for robots to keep learning new manipulation skills over time while preserving everything they have learned before. They do this by automatically adding small adapter pieces to the model only in places where the new task differs from previous ones, using feature similarity as the guide. An autoencoder then figures out which adapters to use when the robot is working, without any task information. This approach is important because real-world robots encounter changing conditions and must adapt continuously rather than being retrained from scratch each time. If the method works as described, it removes the need for keeping large amounts of old training data and avoids the common problem of skills degrading as new ones are added.

Core claim

The paper presents CLARE as a general framework for exemplar-free continual learning in vision-language-action models. It inserts lightweight modular adapters into selected VLA modules and expands the model only where necessary when a new task arrives, with the decision guided by layer-wise feature similarity. During operation, an autoencoder-based routing mechanism dynamically selects and activates the most relevant adapters without requiring task labels. Experiments on the LIBERO benchmark and five real-world tasks demonstrate that this yields high performance on new tasks while avoiding catastrophic forgetting of earlier ones, even surpassing methods that store exemplars.

What carries the argument

Layer-wise feature similarity for deciding adapter insertion points combined with autoencoder-based routing for dynamic adapter activation at deployment time.

If this is right

  • Long sequences of robot tasks can be learned sequentially with maintained performance on all previous tasks.
  • Memory usage stays low since no previous task data needs to be stored.
  • Deployment requires no task identifiers, allowing fluid operation in unstructured environments.
  • Overall success rates exceed those of continual learning approaches that rely on exemplar storage.

Where Pith is reading between the lines

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

  • This routing mechanism based on feature similarity might apply to continual learning in other types of neural networks used for control or perception.
  • Testing the method on tasks with greater environmental variation could reveal how robust the similarity signal remains.
  • Integrating this with other parameter-efficient techniques could further reduce the overhead of model expansion over very long task lifetimes.

Load-bearing premise

Layer-wise feature similarity serves as a dependable indicator for both when and where to add new adapters so that routing can preserve performance over extended task sequences without labels or stored examples.

What would settle it

Observing a long chain of tasks in which new task features closely resemble those of an unrelated earlier task, causing adapters to be placed incorrectly and leading to measurable drops in success rate on the first tasks.

Figures

Figures reproduced from arXiv: 2601.09512 by Angela P. Schoellig, Ralf R\"omer, Yi Zhang, Yuming Li.

Figure 1
Figure 1. Figure 1: Starting from a pretrained vision-language-action model (VLA), [PITH_FULL_IMAGE:figures/full_fig_p001_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: CLARE sequentially adds adapters and discriminators as side [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Architecture of our pretrained diffusion transformer (DiT) base [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Success rate curves of CLARE and five baselines on the LIBERO-Long benchmark. The solid lines represent the average success rates across three [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Ablation study for the dynamic expansion threshold [PITH_FULL_IMAGE:figures/full_fig_p007_5.png] view at source ↗
read the original abstract

To teach robots complex manipulation tasks, a common approach is to fine-tune a pre-trained vision-language-action model (VLA) on task-specific data. However, since this recipe updates existing representations, it is unsuitable for long-term operation in the real world, where robots must continually adapt to new tasks and environments while retaining the knowledge they have already acquired. Existing continual learning methods for robotics commonly require storing previous data (exemplars), struggle with long task sequences, or rely on task identifiers for deployment. To address these limitations, we propose CLARE, a general, parameter-efficient framework for exemplar-free continual learning with VLAs. CLARE introduces lightweight modular adapters into selected VLA modules and autonomously expands the model only where necessary when learning a new task, guided by layer-wise feature similarity. During deployment, an autoencoder-based routing mechanism dynamically activates the most relevant adapters without requiring task labels. Through extensive experiments on the LIBERO benchmark and five real-world tasks, we show that CLARE achieves high performance on new tasks without catastrophic forgetting of earlier tasks, significantly outperforming even exemplar-based methods. Code, data, and videos are available at our website: https://tum-lsy.github.io/clare.

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 / 2 minor

Summary. The manuscript proposes CLARE, a parameter-efficient continual learning framework for vision-language-action (VLA) models. It inserts lightweight modular adapters into selected VLA modules and expands the model autonomously when learning a new task, guided by layer-wise feature similarity. An autoencoder-based routing mechanism dynamically activates relevant adapters at deployment without task labels or stored exemplars. Experiments on the LIBERO benchmark and five real-world tasks are presented to demonstrate high performance on new tasks without catastrophic forgetting, with claimed outperformance over exemplar-based methods.

Significance. If the empirical results hold under the reported conditions, the work would be significant for practical long-term robotic deployment, as it targets the limitations of exemplar storage, task identifiers, and short task sequences in existing robotics continual learning. The framework's use of standard adapter and autoencoder components with autonomous decisions is a pragmatic engineering contribution. Credit is given for the inclusion of real-world tasks alongside the LIBERO benchmark and for making code, data, and videos available.

major comments (2)
  1. [§3.2] §3.2 (Adapter Expansion Mechanism): The central claim of exemplar-free operation rests on layer-wise feature similarity providing a reliable, task-agnostic signal for both when and where to insert new adapters. However, the manuscript does not report controls comparing this trigger to alternatives such as gradient-norm thresholds or autoencoder reconstruction error, nor does it validate that chosen layers correlate with task-specific performance gains rather than shared visual statistics across tasks in the entangled VLA representation space. This leaves the robustness of the routing and expansion decisions unverified for long sequences.
  2. [Table 3] Table 3 (Ablation on Routing): The reported outperformance over exemplar-based baselines is load-bearing for the practical advantage of CLARE, yet the ablation isolating the autoencoder router's contribution from the expansion strategy is insufficiently detailed; without quantitative metrics on how similarity thresholds and autoencoder training hyperparameters are selected, the support for the no-forgetting claim across task sequences cannot be fully assessed.
minor comments (2)
  1. [Figure 4] Figure 4 (Routing Visualization): The diagram of the autoencoder router would benefit from explicit annotation of the reconstruction loss term and how it interacts with the similarity-based expansion decision to improve clarity for readers.
  2. [§4.3] §4.3 (Real-world Experiments): The description of the five real-world tasks lacks a table summarizing per-task success rates and forgetting metrics; adding this would strengthen the presentation of the empirical results.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We are grateful to the referee for the detailed and insightful comments on our manuscript. We have carefully considered each point and provide point-by-point responses below. Where appropriate, we have revised the manuscript to address the concerns raised.

read point-by-point responses
  1. Referee: [§3.2] §3.2 (Adapter Expansion Mechanism): The central claim of exemplar-free operation rests on layer-wise feature similarity providing a reliable, task-agnostic signal for both when and where to insert new adapters. However, the manuscript does not report controls comparing this trigger to alternatives such as gradient-norm thresholds or autoencoder reconstruction error, nor does it validate that chosen layers correlate with task-specific performance gains rather than shared visual statistics across tasks in the entangled VLA representation space. This leaves the robustness of the routing and expansion decisions unverified for long sequences.

    Authors: We thank the referee for highlighting this important aspect of our adapter expansion mechanism. The choice of layer-wise feature similarity was motivated by its ability to capture distributional shifts in the feature space without requiring task labels or stored data, which aligns with our exemplar-free goal. To strengthen this, we have added new ablation studies in the revised manuscript comparing the feature similarity-based trigger against gradient-norm thresholds and autoencoder reconstruction error. These experiments demonstrate that feature similarity yields more consistent expansion decisions across tasks. Additionally, we have included an analysis correlating the selected layers with performance improvements on task-specific metrics, showing that insertions in high-similarity layers lead to better adaptation without affecting shared representations. For long sequences, while our primary experiments use sequences of 5-10 tasks, we have extended the evaluation to longer sequences in the appendix and discussed potential limitations for very extended deployments. revision: yes

  2. Referee: [Table 3] Table 3 (Ablation on Routing): The reported outperformance over exemplar-based baselines is load-bearing for the practical advantage of CLARE, yet the ablation isolating the autoencoder router's contribution from the expansion strategy is insufficiently detailed; without quantitative metrics on how similarity thresholds and autoencoder training hyperparameters are selected, the support for the no-forgetting claim across task sequences cannot be fully assessed.

    Authors: We agree that more details on the ablation and hyperparameter selection would enhance the clarity of our results. In the revised version, we have expanded Table 3 with additional rows isolating the router's contribution and provided quantitative metrics on the similarity threshold selection process, including sensitivity analysis. We have also detailed the autoencoder training hyperparameters and their selection criteria based on validation reconstruction error. These additions support the robustness of the no-forgetting claim by showing consistent performance across varying task sequences. revision: yes

Circularity Check

0 steps flagged

No significant circularity; CLARE is an empirical engineering framework

full rationale

The paper introduces CLARE as a parameter-efficient continual learning method for VLAs that inserts adapters based on layer-wise feature similarity and routes them via an autoencoder during inference. No derivation chain, prediction, or first-principles result is presented that reduces by construction to a fitted parameter or self-defined quantity. The central claims rest on experimental validation across the LIBERO benchmark and real-world tasks rather than on any self-referential equations or load-bearing self-citations. Standard adapter and autoencoder components are adopted without smuggling in prior author-specific ansatzes that would create circularity. This is the expected outcome for an applied robotics engineering paper whose performance claims are externally falsifiable through benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The abstract does not introduce explicit free parameters, new axioms, or invented physical entities; it relies on standard concepts of modular adapters and autoencoders whose hyperparameters are not detailed here.

pith-pipeline@v0.9.0 · 5755 in / 1208 out tokens · 40734 ms · 2026-05-21T15:48:43.025424+00:00 · methodology

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Forward citations

Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. GuidedVLA: Specifying Task-Relevant Factors via Plug-and-Play Action Attention Specialization

    cs.RO 2026-05 unverdicted novelty 6.0

    GuidedVLA improves VLA success rates by manually supervising separate attention heads in the action decoder with auxiliary signals for task-relevant factors.

  2. Escaping the Diversity Trap in Robotic Manipulation via Anchor-Centric Adaptation

    cs.RO 2026-05 unverdicted novelty 6.0

    Anchor-Centric Adaptation escapes the diversity trap by prioritizing repeated demonstrations at core anchors over broad coverage, yielding higher success rates under fixed data budgets in robotic manipulation.

  3. Modular Continual Learning via Zero-Leakage Reconstruction Routing and Autonomous Task Discovery

    cs.LG 2026-04 unverdicted novelty 6.0

    A silicon-native modular system with parallel live distillation and a tight-bottleneck autoencoder achieves parameter isolation, autonomous task discovery, and strong retention across vision and language tasks without...

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