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Ingest: From Human Memory to AI Memory: A Survey on Memory Mechanisms in the Era of LLMs

Type: kb/sources/types/ingest-report.md

Classification

ArXiv survey (2504.15965v2) with a formal taxonomy, a structured literature map, and dozens of cited systems; no original experiment, but methodology and citation density place it firmly in the scientific-paper class rather than essay. Author: Huawei Noah's Ark Lab (Wu, Liang, Zhang, et al.). Industrial research lab with a track record in retrieval and recommendation; credible as a landscape survey, with the usual survey caveat that it organizes rather than tests.

Summary

The survey maps human memory onto LLM-driven AI memory and proposes a 3D-8Q taxonomy: three orthogonal dimensions — object (personal vs system), form (parametric vs non-parametric), time (short- vs long-term) — crossed into eight quadrants, each tagged with a human-memory analogue (sensory, working, episodic, semantic, procedural). It walks the human side (Multi-Store Model, encoding/storage/retrieval, consolidation, reconsolidation, reflection, forgetting), then catalogues AI systems by quadrant: multi-turn dialogue and memory-RAG (mem0, MemoryBank, A-MEM, HippoRAG) for personal non-parametric memory; prompt/KV caching and PEFT/knowledge-editing (Character-LLM, WISE, MemoryLLM) for parametric memory; ReAct/Reflexion/Voyager/ExpeL/Agent Workflow Memory for system reflection-and-refinement; vLLM/ChunkKV for KV management. It closes with six future directions (multimodal, stream, comprehensive, shared memory, collective privacy, automated evolution). Read it for a broad, well-organized field map and a shared vocabulary, not for novel mechanisms or evidence.

Quotes

No source quotes have been retained yet.

Connections Found

The companion connect report found no existing note that cites this snapshot and frames the load-bearing signal as reverse-edge evidenced-by candidates. The strongest fit is the cognitive-analogy-skepticism cluster: three-space-agent-memory-echoes-tulvings-taxonomy (the note currently cites only a single tweet for the human-taxonomy-to-agent move; this is a paper-grade second instance, and the survey's own admission that its quadrants reduce to object/form/time policy dimensions supports the note's "the analogy may be decorative" hedge) and psychology-to-agent-transfer-needs-per-principle-failure-mode-testing (the survey is a large worked example of the wholesale-mapping move that note warns against). The second cluster is artifact/operational axes: the survey's form dimension (parametric/non-parametric) is an independent external parallel to our representational-form axis and its substrate-vs-form distinction in axes-of-artifact-analysis; the four memory-processing stages (construction, management, retrieval, usage) map onto the operational axes in memory-design-adds-operational-axes-to-artifact-analysis. The survey's quadrant-VI (Reflexion, Voyager, ExpeL) and quadrant-VIII (WISE, MemoryLLM) populate the two behaviour-change mechanisms in continual-learning-open-problem-is-behaviour-not-knowledge. Connect also flagged that agentic-memory-systems-comparative-review reaches a compatible "storage form under-determines design" conclusion from a different taxonomy (substrate/lineage/authority/activation). What the source adds beyond existing connections: a third independent top-level memory taxonomy that, like ours, concludes storage form is not the consequential fork; and a survey-level catalogue of named systems per quadrant. As context only (not actionable here), connect noted a coverage gap — the survey's "shared memory / collective privacy" future direction has no corresponding KB note.

Extractable Value

  1. Third independent taxonomy that converges on "form is not the fork." -- The survey explicitly states parametric short-term personal and system memory "overlap technically" and differ only by focus (individual-input processing vs task-execution reuse). This is external corroboration, from a different axis set, of our recurring claim that storage form/substrate under-determines design — strengthening axes-of-artifact-analysis, representational-form, and the comparative review. [just-a-reference]

  2. Paper-grade second instance for the Tulving-mapping note. -- three-space-agent-memory-echoes-tulvings-taxonomy currently rests on a single tweet. The survey makes the same human-taxonomy-to-agent move at scale, and its self-reduction to object/form/time is direct support for the "decorative analogy" hedge. Upgrades the note's evidence base from one informal source to one informal plus one paper. [quick-win]

  3. A worked example of unguarded wholesale cognitive transfer. -- The survey maps consolidation, reconsolidation, reflection, and forgetting onto AI mechanisms with no per-principle failure-mode testing — exactly the move psychology-to-agent-transfer-needs-per-principle-failure-mode-testing cautions against. Useful as a citable specimen of the failure pattern, not as evidence the analogies hold. [just-a-reference]

  4. Per-quadrant system catalogue for the two continual-learning mechanisms. -- Quadrant-VI (non-parametric reflection: Reflexion, Voyager, ExpeL, Buffer of Thoughts, Agent Workflow Memory) and quadrant-VIII (parametric editing: WISE, MemoryLLM) give continual-learning-open-problem-is-behaviour-not-knowledge a ready list of instances of its readable-artifact vs distributed-parametric behaviour-change split. [just-a-reference]

  5. Vocabulary: the four memory-processing stages (construction, management, retrieval, usage). -- A clean external naming of the long-term-memory lifecycle that parallels the operational axes (capture, derivation, activation, lifecycle) in memory-design-adds-operational-axes-to-artifact-analysis. Improves retrieval and gives an external label set to cite when discussing memory operations. [just-a-reference]

  6. Named coverage gap: shared memory and collective privacy. -- The survey's cross-agent / cross-domain memory-sharing and group-level-privacy future directions have no KB note; nearest hits are about coordination and authority, not aggregated-data privacy. A candidate topic if cross-agent memory becomes in-scope for our methodology. [deep-dive]

Limitations (our opinion)

This is editorial judgment. As a survey it organizes the field but tests nothing, so it cannot tell us which of its eight quadrants matter or when a human-memory analogy actually predicts agent behavior — the central weakness our own psychology-to-agent-transfer note identifies. The 3D-8Q framing is also partly decorative: by the authors' own admission several quadrants collapse (parametric short-term personal vs system "overlap technically"), and the human-memory labels (sensory/episodic/procedural) are attached to quadrants by analogy rather than derived from any functional difference, so naming a quadrant "procedural memory" explains nothing the object/form/time coordinates did not already fix. The mapping is hard to vary — almost any AI memory mechanism can be slotted into some quadrant and given a human-memory name, which makes the taxonomy more a filing scheme than a predictive theory. Treat the system citations as a discovery index, not as validated comparisons: the survey reports what each system claims, not head-to-head results, and gives no baselines. The future-directions section is aspirational and should not be read as evidence those directions are tractable.

Add a reverse-edge evidenced-by link from three-space-agent-memory-echoes-tulvings-taxonomy-but-the-analogy.md to this snapshot (its strongest, lowest-effort fit: the note currently cites only one tweet and this is a paper-grade second instance plus support for its "decorative analogy" hedge). Authoring that edit is a separate explicit step — run cp-skill-write/cp-skill-connect follow-through on that note rather than treating it as done here. Do not pursue the cross-taxonomy synthesis note flagged by connect unless a writer judges it adds beyond the existing operational-axes and four-field notes.