code: def infer(
      self,
      input: torch.Tensor,
      lengths: torch.Tensor,
      states: Optional[List[List[torch.Tensor]]],
  ) -> Tuple[torch.Tensor, torch.Tensor, List[List[torch.Tensor]]]:
      pass
  
imports: from abc import ABC, abstractmethod
  from typing import List, Optional, Tuple
  import torch
  from torchaudio.models import Emformer
label_desc: Use image node_id 2 for calling the _Transcriber obj's underlying member method code with example usage: obj.infer(input, lengths, states) without return types