Lucas Beyer (bl16) on X: "I like to think that i know reasonably well what to expect from floats on gpus, but the consistency in this one still surprised me!"

Lucas Beyer (bl16)

@giffmana

I like to think that i know reasonably well what to expect from floats on gpus, but the consistency in this one still surprised me!

div (fp32)

@divagr1925

Oct 30

1/4 New writeup: you can fingerprint the exact GPU you're running on with a default torch.index_add_ call, even among identical GPUs. This works because floating-point maths depends on order, and every GPU has its own. This fingerprint survives reboots and can't be faked.

00:00

6:35 PM · Oct 31, 2026·

21.1K

Views

14

17

301

224