The vmap result is wild — 45x faster, and it even beats XLA’s fused attention at large sizes. Just from telling the compiler that Q blocks are independent. But I still don’t really understand why the original was so slow, or what the hardware is actually doing with those tiles. Time to look up how TPU works.
64-bit (double)，详情可参考line 下載
，这一点在谷歌中也有详细论述
If you see an octal byte beginning with 0 or 1, it's plain
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