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The code may fail to transfer grads from TPU core memory to CPU host memory

Hiya! I was talking with Skye over at google/jax#2108 (comment)

one issue with the code snippet you have at the top for transferring grads from TPU to CPU memory: device_put is a no-op inside jit (I think there may an issue about making this less of a gotcha, but I can't find it now). Using device_put with a CPU device is the right idea though, it just has to happen outside of a compiled function.

The code snippet Skye is referring to was copied from this codebase. So I thought I should open an issue, because it sounds like that code is nonfunctional.

I’m posting this from my phone, but I’ll add more details in a little while.

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