arXiv:2502.03766cs.CL2025-02

不改模型权重,用分层对齐重构语言模型的隐空间表示。

Hierarchical Contextual Manifold Alignment for Structuring Latent Representations in Large Language Models

  • 通过分层结构对齐重构嵌入表示,不修改模型参数。
  • 提升稀有词检索、对抗鲁棒性和长程依赖追踪能力。
  • 适合追求高效优化与可解释性的大模型改进场景。

隐式标记表示的组织方式对语言模型的稳定性、泛化能力和上下文一致性至关重要。传统嵌入优化方法常依赖参数调整,带来额外计算开销。本文提出一种分层对齐方法,在不改变核心模型权重的前提下,重构标记嵌入,确保不同语言情境下表征分布的一致性。实验表明,该方法在稀有词检索、对抗鲁棒性和长程依赖跟踪方面均有提升,验证了分层结构在缓解隐空间不一致方面的优势。与常规微调和嵌入扰动方法相比,该方法保持计算效率的同时显著提升表示质量。对齐过程引入的结构优化增强了各类语言任务中的上下文稳定性,减少了标记邻近关系的不一致性,提升了生成过程的可解释性。详细计算评估显示,重对齐过程带来的推理开销极小,确保了性能提升不以效率为代价。研究结果强化了结构化表示学习的重要性,表明分层嵌入修正可作为有效策略,在保留预训练语义关联的同时优化隐空间分布。

原文摘要 · Abstract (English)

The organization of latent token representations plays a crucial role in determining the stability, generalization, and contextual consistency of language models, yet conventional approaches to embedding refinement often rely on parameter modifications that introduce additional computational overhead. A hierarchical alignment method was introduced to restructure token embeddings without altering core model weights, ensuring that representational distributions maintained coherence across different linguistic contexts. Experimental evaluations demonstrated improvements in rare token retrieval, adversarial robustness, and long-range dependency tracking, highlighting the advantages of hierarchical structuring in mitigating inconsistencies in latent space organization. The comparative analysis against conventional fine-tuning and embedding perturbation methods revealed that hierarchical restructuring maintained computational efficiency while achieving measurable gains in representation quality. Structural refinements introduced through the alignment process resulted in improved contextual stability across varied linguistic tasks, reducing inconsistencies in token proximity relationships and enhancing interpretability in language generation. A detailed computational assessment confirmed that the realignment process introduced minimal inference overhead, ensuring that representational improvements did not compromise model efficiency. The findings reinforced the broader significance of structured representation learning, illustrating that hierarchical embedding modifications could serve as an effective strategy for refining latent space distributions while preserving pre-learned semantic associations.

大模型隐空间对齐结构优化

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