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soulitzer avatar soulitzer commented on June 23, 2024 2

Given those two points, it seems likely that when autograd spawns threads, we aren't properly copying over the threadlocal AMP state from the spawned thread?

Yup - today the engine automatically replicates TLS state managed by ThreadLocalState() onto the spawned threads. We should have autocast dtype state to also be managed this way.

from pytorch.

bdhirsh avatar bdhirsh commented on June 23, 2024

tentatively marking hi-pri since running the backward at a different precision than the user asked for seems bad

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