dorsal/arxiv
View SchemaBi-Mem: Bidirectional Construction of Hierarchical Memory for Personalized LLMs via Inductive-Reflective Agents
| Authors | Wenyu Mao, Haosong Tan, Shuchang Liu, Haoyang Liu, Yifan Xu, Huaxiang Ji, Xiang Wang |
|---|---|
| Categories | |
| ArXiv ID | 2601.06490vv1 |
| URL | https://arxiv.org/abs/2601.06490 |
| License | http://creativecommons.org/licenses/by/4.0/ |
Abstract
Constructing memory from users' long-term conversations overcomes LLMs' contextual limitations and enables personalized interactions. Recent studies focus on hierarchical memory to model users' multi-granular behavioral patterns via clustering and aggregating historical conversations. However, conversational noise and memory hallucinations can be amplified during clustering, causing locally aggregated memories to misalign with the user's global persona. To mitigate this issue, we propose Bi-Mem, an agentic framework ensuring hierarchical memory fidelity through bidirectional construction. Specifically, we deploy an inductive agent to form the hierarchical memory: it extracts factual information from raw conversations to form fact-level memory, aggregates them into thematic scenes (i.e., local scene-level memory) using graph clustering, and infers users' profiles as global persona-level memory. Simultaneously, a reflective agent is designed to calibrate local scene-level memories using global constraints derived from the persona-level memory, thereby enforcing global-local alignment. For coherent memory recall, we propose an associative retrieval mechanism: beyond initial hierarchical search, a spreading activation process allows facts to evoke contextual scenes, while scene-level matches retrieve salient supporting factual information. Empirical evaluations demonstrate that Bi-Mem achieves significant improvements in question answering performance on long-term personalized conversational tasks.
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"date_created": "2026-02-17T05:53:08.035000Z",
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"abstract": "Constructing memory from users\u0027 long-term conversations overcomes LLMs\u0027 contextual limitations and enables personalized interactions. Recent studies focus on hierarchical memory to model users\u0027 multi-granular behavioral patterns via clustering and aggregating historical conversations. However, conversational noise and memory hallucinations can be amplified during clustering, causing locally aggregated memories to misalign with the user\u0027s global persona. To mitigate this issue, we propose Bi-Mem, an agentic framework ensuring hierarchical memory fidelity through bidirectional construction. Specifically, we deploy an inductive agent to form the hierarchical memory: it extracts factual information from raw conversations to form fact-level memory, aggregates them into thematic scenes (i.e., local scene-level memory) using graph clustering, and infers users\u0027 profiles as global persona-level memory. Simultaneously, a reflective agent is designed to calibrate local scene-level memories using global constraints derived from the persona-level memory, thereby enforcing global-local alignment. For coherent memory recall, we propose an associative retrieval mechanism: beyond initial hierarchical search, a spreading activation process allows facts to evoke contextual scenes, while scene-level matches retrieve salient supporting factual information. Empirical evaluations demonstrate that Bi-Mem achieves significant improvements in question answering performance on long-term personalized conversational tasks.",
"arxiv_id": "2601.06490",
"authors": [
"Wenyu Mao",
"Haosong Tan",
"Shuchang Liu",
"Haoyang Liu",
"Yifan Xu",
"Huaxiang Ji",
"Xiang Wang"
],
"categories": [
"cs.MA"
],
"license": "http://creativecommons.org/licenses/by/4.0/",
"title": "Bi-Mem: Bidirectional Construction of Hierarchical Memory for Personalized LLMs via Inductive-Reflective Agents",
"url": "https://arxiv.org/abs/2601.06490",
"version": "v1"
},
"schema_id": "dorsal/arxiv",
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"type": "Model",
"variant": "snapshot-2026-01-17",
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