code: def prepare_training(self):
      self.optimizer = optim.Adam(self.parameters(), 0.001)
  
file_path: TTS/TTS/tts/layers/bark/hubert/tokenizer.py
imports: import json
  import os.path
  from zipfile import ZipFile
  import numpy
  import torch
  from torch import nn, optim
label_desc: Use image node_id 4 for calling the HubertTokenizer obj's underlying member method code with example usage: obj.prepare_training() without return types