code: def _init_backward_decoder(self):
      self.decoder_backward = copy.deepcopy(self.decoder)
  
imports: import copy
  from abc import ABC, abstractmethod
  import torch
  from torch import nn
  from TTS.tts.utils.generic_utils import sequence_mask
label_desc: Use image node_id 3 for calling the TacotronAbstract obj's underlying member method code with example usage: obj._init_backward_decoder() without return types