Sebastian Raschka • 6/17/2025

Understanding and Coding the KV Cache in LLMs from Scratch

This article provides a detailed, from-scratch explanation of KV (Key-Value) caches, a critical technique for speeding up text generation in LLMs during inference. It covers the conceptual workings, trade-offs in memory and complexity, and includes a human-readable code implementation to illustrate the mechanism.

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#Attention Mechanism #Kv Cache #LLM Inference