implement XLAHooks
and register it to PyTorch when loaded.
#9683
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This PR adds
XLAHooks
that override the placeholder implementation added pytorch/pytorch#161369.only part of the methods are implemented. I believe not all the methods are actually needed. therefore, i only implemented the most basic ones. People can implement the other methods when they need.
IT DOSEN'T BUILD, BUT FEEL FREE TO REVIEW!
This PR depends on pytorch/pytorch#161369 and #9682. This PR won't build before the two PR submitted.