Flash Attention: what it does and why it matters

Flash Attention addresses critical memory bandwidth bottlenecks in transformer training. On A100 GPUs, compute units often remain idle 40-60% of the time because HBM cannot supply data fast enough, specifically during attention computation. Meanwhile, Physical AI is being defined as a distinct field, separate from world models, embodied AI, physics AI, and digital twins. These developments highlight the ongoing effort to optimize hardware efficiency and clarify the terminology surrounding AI integration into physical systems.