code: def forward(self, g, tgt_seq=None, src_seq=None):
      params = self._extract_params(g)
      return self._run_forward_pass(**params, tgt_seq=tgt_seq)
  
imports: import torch.nn
label_desc: Use image node_id 4 for calling the RNNDecoderBase obj's underlying member method code with example usage: obj.forward(g, tgt_seq, src_seq) and returns: self