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Yanghan Wang authored
Summary: DDPPlugin has been renamed to DDPStrategy (as part of https://github.com/PyTorchLightning/pytorch-lightning/issues/10549), causing oss CI to fail. Simply skipping the import to unblock CI since DDP feature is not used in test. Reviewed By: kazhang Differential Revision: D33351636 fbshipit-source-id: 7a1881c8cd48d9ff17edd41137d27a976103fdde
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