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A default torch.index_add_ call may fingerprint individual GPUs, even identical ones
The claimed fingerprint relies on floating-point math's dependence on order, which the author says differs for every GPU.
TLDR
The author claims a default torch.index_add_ call can identify the exact GPU in use, even among identical GPUs. They say the fingerprint survives reboots and cannot be faked. A commenter on X said the consistency surprised them despite their familiarity with GPU floating-point behavior.
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