    def __getattr__(self, name):
        """Forward missing attributes to twice-wrapped module."""
        try:
            # defer to nn.Module's logic
            return super().__getattr__(name)
        except AttributeError:
            try:
                # forward to the once-wrapped module
                return getattr(self.module, name)
            except AttributeError:
                # forward to the twice-wrapped module
                return getattr(self.module.module, name)
Forward missing attributes to twice-wrapped module.
fairseq/distributed/module_proxy_wrapper.py