I work with transformers daily, and FlashAttention changed how I think about performance.
Tri Dao's Stanford MLSys talk explains how FlashAttention uses tiling and recomputation to avoid the GPU memory bottleneck in attention. It's not approximate -- it computes exact attention with up to 9x fewer memory reads by being IO-aware about the HBM/SRAM hierarchy. The result: 3x speedup on GPT-2 and the ability to handle 16K+ sequences.
If you run transformers and haven't watched this, your training loops are leaving speed on the table.
Check it out here: https://amplt.de/DrearyBleakRequirement
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