code: def forward(
      self, input: torch.Tensor, input_lengths: torch.Tensor = None
  ) -> Tuple[torch.Tensor, torch.Tensor]:
      # return output, output_lengths
      raise NotImplementedError
  
imports: from abc import ABC, abstractmethod
  from typing import Tuple
  import torch
label_desc: Use image node_id 1 for calling the AbsNormalize obj's underlying member method code with example usage: obj.forward(input, input_lengths) without return types