How to Build an LLM Memory Layer for AI Applications?

Humpy Adepu

Define Memory Purpose: Clarify what the memory layer should store: facts, user history, or conversation context for retrieval.

Select Memory Structure: Choose vector memory, key-value stores or databases based on speed, size, and retrieval needs.

Implement Embeddings: Encode inputs into dense vectors that capture semantic meaning for efficient memory comparison and search.

Build Retriever Logic: Use similarity metrics (cosine, dot product) to fetch relevant memories matching new queries.

Integrate with LLM: Feed retrieved memory chunks into model prompts so the LLM uses them during generation.

Manage Memory Growth: Apply pruning, summarising or hierarchical storage to keep memory efficient and cost-effective.

Design Update Rules: Allow memory to evolve: add new entries, update existing, and remove stale information.

Ensure Privacy Controls: Secure sensitive memory data with encryption and access restrictions in compliance with policies.

Evaluate & Iterate: Continuously test memory effectiveness, refine retrieval quality, and improve integration for better model responses.

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