FlatAttention groups tiles and uses NoC collectives to reduce HBM traffic by up to 16x and reach 89.3% utilization for multi-head attention on many-PE accelerators.
On the computational complexity of self-attention,
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FlatAttention: Dataflow and Fabric Collectives Co-Optimization for Efficient Multi-Head Attention on Tile-Based Many-PE Accelerators
FlatAttention groups tiles and uses NoC collectives to reduce HBM traffic by up to 16x and reach 89.3% utilization for multi-head attention on many-PE accelerators.