code: def output(self, do):
      desired = list(do.shape)[:2] + [self.v]
      x = self.p.unsqueeze(0).unsqueeze(0)
      return x.expand(desired)
  
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 2 for calling the UnigramModel obj's underlying member method code with example usage: obj.output(do) and returns: x