MemDefrag: Latent Memory Defragmentation for Large Language Models
Latent memory, which stores past knowledge fragments as per-layer hidden states, has emerged as a promising paradigm (e.g., MemoryLLM and M+) for long-term memory in large language models (LLMs). However, the paradigm suffers from significant performance degradation during memory updates, due to positional encoding misalignment and the absence of any tracing mechanism to distinguish target memory fragments from irrelevant ones. To discover such a tracing mechanism, we probe the layer-wise attention density over stored memory fragments, and find that a small set of middle transformer layers consistently concentrates the highest density on the target fragment - exposing an inherent tracing ...
| Authors | Ruiyi Yan, Zhuoyuan Mao, Yiwen Guo |
|---|---|
| Primary category | cs.CL |
| Published | 7 July 2026 |
| Last updated at source | 29 August 2026 |
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