code: def forward(self, x, y=None) -> torch.Tensor:
      return self.ffn(x, y=y)
  
imports: import torch
  import torch.nn
  import pytest
  from allennlp.common.params import Params
  from allennlp.common.testing import multi_device
  from allennlp.nn.checkpoint.checkpoint_wrapper import CheckpointWrapper, TorchCheckpointWrapper
label_desc: Use image node_id 2 for calling the ModuleWithKwargs obj's underlying member method code with example usage: obj.forward(x, y) and returns: self