seniorNeural Networks
What is Flash Attention and why is it efficient?
Updated May 17, 2026
Short answer
Flash Attention is a memory-efficient algorithm for computing attention faster using GPU-aware optimization.
Deep explanation
Flash Attention reduces memory overhead by avoiding materialization of full attention matrices. It uses tiling, recomputation, and IO-aware GPU kernels to minimize HBM access, drastically improving speed for long sequences.
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