Function ddp_sync

torch_utils/misc.py:169–175

(module, sync)

@contextlib.contextmanager
def ddp_sync(module, sync):
    assert isinstance(module, torch.nn.Module)
    if sync or not isinstance(module, torch.nn.parallel.DistributedDataParallel):
        yield
    else:
        with module.no_sync():
            yield

#----------------------------------------------------------------------------
# Check DistributedDataParallel consistency across processes.