code: def forward(self, x, encoder_state, incr_state=None):
      return x.unsqueeze(-1), None
  
file_path: ParlAI/parlai/agents/test_agents/unigram.py
imports: import torch
  import torch.nn
  from parlai.core.torch_generator_agent import TorchGeneratorAgent, TorchGeneratorModel
label_desc: Use image node_id 1 for calling the UnigramDecoder obj's underlying member method code with example usage: obj.forward(x, encoder_state, incr_state) and returns: x,  None