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11.11 Flash Attention
Last Updated: March 12, 2026
Ashish Pratap Singh
14 min read
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11.11 Flash Attention
The Problem
GPU Memory Hierarchy
Standard Attention: Step by Step
Flash Attention: The Key Insight
The Tiling Algorithm
The Recomputation Trade-off
Flash Attention 2
Flash Attention 3
Impact in Practice
Using Flash Attention
Exercise
Summary
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