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6f9aef5fef
Summary:
To support exporting a cuda model on a CPU-only machine under fake tensor mode.
User commonly need to move sample inputs to the cuda device with .to("cuda:0") or .to("cuda") call.
This diff supports this.
I expect the following pattern to work
```
with FakeTensorMode(allow_non_fake_inputs=True):
cuda_module = module.to("cuda:0")
cuda_sample_inputs = tuple([x.to("cuda:0") for x in sample_inputs])
with torch.no_grad():
ep = torch.export.export(cuda_module, cuda_sample_inputs)
```
Before
Moving module.to("cuda:0") under fake tensor mode would have parameter on `meta` device.
After
parameters would be on "cuda:0" .
Test Plan: buck2 run fbcode//caffe2/test:fake_tensor -- --r test_move_module
Reviewed By: mikaylagawarecki
Differential Revision: D80102876
Pull Request resolved: https://github.com/pytorch/pytorch/pull/163433
Approved by: https://github.com/albanD