[pt2e] Avoid getting model device once per node #2695
Merged
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Summary: Previously, we call
assert_and_get_unqiue_device
once per node in both prepare and convert. This is expensive and unnecessary since the model device is the same across all nodes, so we should just call this once in the beginning and reuse the same model device across all the nodes.torchao version of pytorch/pytorch#159901
Note: The prepare path is not completely done yet, since we are blocked on the pytorch PR on being merged. It's different from convert since it still calls utility functions from
torch.ao.quantization.fx
.Test Plan: