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Memory-Based Learning(MBL)

Improves agent behavior by retrieving and reusing stored experiences at decision time instead of updating model weights. Past interactions, outcomes, and user feedback are indexed as memories and recalled by similarity to shape new decisions, enabling continual personalization without retraining.

Complexity: mediumLearning and Adaptation

In 30 seconds

What: Stores past interactions with outcomes and feedback, then retrieves similar cases at decision time to shape new choices without retraining the model.
When to use: Personalization matters across repeated interactions and you can capture reliable feedback signals to weight which past experiences to reuse.
Watch out: Recall quality degrades sharply if memories lack clear outcome labels or if similarity matching pulls irrelevant past cases into current decisions.

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Experience storage with outcome and feedback tagging
Similarity-based recall at decision time
Outcome-weighted reuse of past solutions
Continual personalization without model retraining
Case-based reasoning over accumulated episodes

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References

The papers, specifications, and repositories this pattern is based on.

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Patterns

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Design Patterns & Techniques

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🧳

Memory-Based Learning(MBL)

Complexity: mediumLearning and Adaptation

In 30 seconds

What: Stores past interactions with outcomes and feedback, then retrieves similar cases at decision time to shape new choices without retraining the model.
When to use: Personalization matters across repeated interactions and you can capture reliable feedback signals to weight which past experiences to reuse.
Watch out: Recall quality degrades sharply if memories lack clear outcome labels or if similarity matching pulls irrelevant past cases into current decisions.

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30-Second Overview

Pattern: Learn by storing, retrieving, and adapting from a memory bank of past experiences and examples

Why: Enables few-shot learning, prevents catastrophic forgetting, and supports personalization through accumulated experience

Key Insight: Effective memory systems combine efficient storage, smart retrieval, and adaptive integration of past experiences

Quick Implementation

1Store:Build memory bank of experiences, examples, or patterns

2Index:Create efficient retrieval mechanism (embeddings, keys)

3Retrieve:Find relevant memories based on current context

4Adapt:Use retrieved memories to inform current predictions

5Update:Add new experiences and manage memory capacity

Example: experience_bank + query → similarity_search → relevant_memories → adapted_response

Do's & Don'ts

✅Use efficient similarity search (FAISS, approximate nearest neighbors)

✅Implement memory consolidation and forgetting mechanisms

✅Store both positive and negative examples for better learning

✅Use hierarchical memory structures for different time scales

✅Apply memory replay techniques to prevent catastrophic forgetting

✅Implement adaptive memory capacity based on importance

❌Store memories without considering retrieval efficiency

❌Use unlimited memory without pruning strategies

❌Ignore memory quality and redundancy issues

❌Apply without proper similarity metrics for domain

❌Neglect privacy and security considerations for stored data

When to Use

Use When

• Few-shot learning scenarios with limited training data
• Non-stationary environments requiring experience replay
• Tasks benefit from analogical reasoning and case-based learning
• Need to maintain long-term knowledge and prevent forgetting
• Personalization requires storing user-specific experiences

Avoid When

• Memory storage and retrieval costs are prohibitive
• Task has abundant training data and stable patterns
• Real-time constraints prevent memory lookup
• Privacy regulations restrict data storage
• Simple pattern recognition without need for examples

Key Metrics

Retrieval Accuracy

Precision/recall of relevant memory retrieval

Memory Utilization

Effective use of stored experiences

Adaptation Speed

Learning rate improvement with memory

Memory Efficiency

Storage cost vs performance gain

Forgetting Resistance

Knowledge retention over time

Retrieval Latency

Time to find and use relevant memories

Top Use Cases

Few-Shot Learning: Learn new tasks from minimal examples using memory of similar cases

Personalized Recommendations: Store user preferences and behavior patterns for customization

Lifelong Learning: Maintain knowledge across multiple tasks without catastrophic forgetting

Case-Based Reasoning: Solve new problems by retrieving and adapting similar past solutions

Neural Architecture Search: Remember promising architectures and design patterns

Continual Learning: Replay important experiences to maintain performance on old tasks

References & Further Reading

Deepen your understanding with these curated resources

Foundational Memory-Based Learning

Memory-Based Learning: Using Similarity for Smoothing (Aha et al., 1991)

Case-Based Reasoning: A Research Paradigm (Kolodner, 1993)

Memory-Based Learning in Neural Networks (Thrun & Pratt, 1998)

Instance-Based Learning Algorithms (Aha et al., 1991)

Neural Memory Networks

Memory Networks (Weston et al., 2014)

End-To-End Memory Networks (Sukhbaatar et al., 2015)

Neural Turing Machines (Graves et al., 2014)

Differentiable Neural Computers (Graves et al., 2016)

Meta-Learning with Memory

Model-Agnostic Meta-Learning for Fast Adaptation of Deep Networks

One-shot Learning with Memory-Augmented Neural Networks

Learning to Remember Rare Events (Kaiser et al., 2017)

Experience Replay & Continual Learning

Experience Replay for Continual Learning (Rolnick et al., 2019)

Gradient Episodic Memory for Continual Learning (Lopez-Paz & Ranzato, 2017)

Efficient Lifelong Learning with A-GEM (Chaudhry et al., 2018)

Retrieval-Augmented Learning

Retrieval-Augmented Generation for Knowledge-Intensive NLP Tasks (Lewis et al., 2020)

REALM: Retrieval-Augmented Language Model Pre-Training (Guu et al., 2020)

Dense Passage Retrieval for Open-Domain Question Answering (Karpukhin et al., 2020)

Leveraging Passage Retrieval with Generative Models for Open Domain Question Answering

Recent Advances (2023-2024)

Extending Context Window of Large Language Models via Positional Interpolation

Memory Architectures

Compressive Transformers for Long-Range Sequence Modelling (Rae et al., 2019)

Longformer: The Long-Document Transformer (Beltagy et al., 2020)

BigBird: Transformers for Longer Sequences (Zaheer et al., 2020)

Episodic Memory Systems

Neural Episodic Control (Pritzel et al., 2017)

Model-Free Episodic Control (Blundell et al., 2016)

Episodic Memory in Lifelong Language Learning (d'Autume et al., 2019)

Been There, Done That: Meta-Learning with Episodic Recall

Implementation Frameworks

FAISS: Efficient Similarity Search Library

Weaviate: Vector Database for ML

Pinecone: Vector Database Service

Milvus: Vector Database Management System

Memory Management Tools

Annoy: Approximate Nearest Neighbors Library

ScaNN: Scalable Nearest Neighbors by Google

Hnswlib: Fast Approximate Nearest Neighbor Search

LanceDB: Vector Database for AI Applications

Production Applications

OpenAI: GPT with Retrieval and Memory Systems

Google: LaMDA with Memory and Retrieval

Facebook AI: Memory-Augmented Recommendation Systems

DeepMind: Memory Systems for Reinforcement Learning

Evaluation & Benchmarks

MemN2N: Memory Networks for Question Answering

bAbI Tasks: Memory and Reasoning Benchmark

Continual Learning Benchmark (CLB)

Meta-Learning Evaluation Suite

Experience storage with outcome and feedback tagging
Similarity-based recall at decision time
Outcome-weighted reuse of past solutions
Continual personalization without model retraining
Case-based reasoning over accumulated episodes

The Agent Architect

One pattern, one tradeoff, one production failure story. A short weekly briefing for people building agentic systems.

Weekly email, one-click unsubscribe. We only use your address to send the briefing.

References

The papers, specifications, and repositories this pattern is based on.

From the engineer behind this catalog

Get your agent architecture reviewed

€750 instead of €1,500, one week, written report and walkthrough call, until 30 September

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Loading patterns…

Memory-Based Learning(MBL)

In 30 seconds

Ask the AI expert about this pattern

Memory-Based Learning: Overview

The Agent Architect

References

Get your agent architecture reviewed

Patterns

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Design Patterns & Techniques

Loading patterns…

Memory-Based Learning(MBL)

In 30 seconds

Ask the AI expert about this pattern

30-Second Overview

Quick Implementation

Do's & Don'ts

When to Use

Use When

Avoid When

Key Metrics

Top Use Cases

References & Further Reading

Foundational Memory-Based Learning

Neural Memory Networks

Meta-Learning with Memory

Experience Replay & Continual Learning

Retrieval-Augmented Learning

Recent Advances (2023-2024)

Memory Architectures

Episodic Memory Systems

Implementation Frameworks

Memory Management Tools

Production Applications

Evaluation & Benchmarks

Memory-Based Learning: Overview

The Agent Architect

References

Get your agent architecture reviewed

Patterns

Design Patterns & Techniques

Loading patterns…

Design Patterns & Techniques

30-Second Overview

Quick Implementation

Do's & Don'ts

When to Use

Use When

Avoid When

Key Metrics

Top Use Cases

References & Further Reading

Foundational Memory-Based Learning

Neural Memory Networks

Meta-Learning with Memory

Experience Replay & Continual Learning

Retrieval-Augmented Learning

Recent Advances (2023-2024)

Memory Architectures

Episodic Memory Systems

Implementation Frameworks

Memory Management Tools

Production Applications

Evaluation & Benchmarks

Design Patterns & Techniques