[wip] Make quantization modules work with DataParallel (#37032)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/37032
DataParallel requires all params and buffers of child modules to be updated
in place because of how it implements model replication during the
forward pass (see https://github.com/pytorch/pytorch/pull/12671 for
context). Any params or buffers not updated in place are lost and not
propagated back to the master.
This diff updates (some quantized modules) (TBD: all quantized modules? determine a good cut
point) to do their parameter update in-place. This will enable static
quant and QAT to work correctly with DataParallel.
TODO: https://github.com/pytorch/pytorch/pull/32684 needs to land before we can fix the graph mode test failures on this PR.
Test Plan:
script failed before and passes after the diff:
https://gist.github.com/vkuzo/78b06c01f23f98ee2aaaeb37e55f8d40
TODO before land: add integration testing
Imported from OSS
Differential Revision: D21206454
fbshipit-source-id: df6b4b04d0ae0f7ef582c82d81418163019e96f7
