code: def train_step(
      self,
  ):
      pass
  
imports: import os
  from dataclasses import dataclass
  from typing import Optional
  import numpy
  from coqpit import Coqpit
  from encodec import EncodecModel
  from transformers import BertTokenizer
  from TTS.tts.layers.bark.inference_funcs import codec_decode, generate_coarse, generate_fine, generate_text_semantic, generate_voice, load_voice
  from TTS.tts.layers.bark.load_model import load_model
  from TTS.tts.layers.bark.model import GPT
  from TTS.tts.layers.bark.model_fine import FineGPT
  from TTS.tts.models.base_tts import BaseTTS
label_desc: Use image node_id 4 for calling the Bark obj's underlying member method code with example usage: obj.train_step() without return types