SETA解决了LLM持续学习中任务知识冲突的核心痛点，做多任务模型训练或知识迁移的团队可以直接参考其专家分解思路，值得关注其稀疏子空间设计。
大型语言模型在持续学习中面临可塑性-稳定性困境，学习新任务常导致旧知识灾难性遗忘。现有方法统一处理参数，无法区分任务特定知识与共享能力。SETA框架通过自适应稀疏子空间分解，将知识分离为任务特定专家和共享专家，利用弹性锚定和路由正则化保护共享知识，统一门控网络自动检索正确专家组合。在LLaMA-2 7B和Qwen3-4B上的实验表明，SETA在多个领域基准上达到或超越现有方法，尤其擅长保留早期任务知识并改善反向迁移。
Sparse Subspace-to-Expert Sharing for Task-Agnostic Continual Learning
Continual learning in Large Language Models (LLMs) is hindered by the plasticity-stability dilemma, where acquiring new capabilities often leads to catastrophic forgetting of previous knowledge. Existing methods typically treat parameters uniformly, failing to distinguish between specific task knowledge and shared capabilities. We introduce Mixture of Sparse Experts for Task Agnostic Continual Learning (SETA), a framework that resolves the plasticity-stability conflict through adaptive sparse subspace decomposition into task-specific expert modules. Unlike standard updates, where tasks compete for the same parameters, SETA separates knowledge into unique experts, designed to isolate task-specific patterns, and shared experts, responsible for capturing common features. This structure is maintained through adaptive elastic anchoring and a routing-aware regularization that jointly protect shared knowledge at both the weight and routing levels and enable a unified gating network to automatically retrieve the correct expert combination during inference. Extensive experiments across diverse domain-specific benchmarks demonstrate that SETA achieves competitive or superior overall performance relative to state-of-the-art continual learning baselines, with particularly strong retention of early-task knowledge and improved backward transfer on LLaMA-2 7B and Qwen3-4B.