code: def load_wav(self, filename):
      audio = self.ap.load_wav(filename)
      return audio
  
imports: import collections
  import os
  import random
  from multiprocessing import Manager, Pool
  import numpy
  import torch
  import tqdm
  from torch.utils.data import Dataset
  from TTS.tts.utils.data import prepare_data, prepare_stop_target, prepare_tensor
  from TTS.tts.utils.text import pad_with_eos_bos, phoneme_to_sequence, text_to_sequence
label_desc: Use image node_id 2 for calling the MyDataset obj's underlying member method code with example usage: obj.load_wav(filename) and returns: audio