code: def __getitem__(self, key):
      item = self.dataset[key]
      return self.process_datapoint(item)
  
imports: from typing import Callable, List, Tuple
  import torch
  from torch import Tensor
  from torch.utils.data.dataset import random_split
  from torchaudio.datasets import LJSPEECH
label_desc: Use image node_id 2 for calling the Processed obj's underlying member method code with example usage: obj.__getitem__(key) and returns: self