code: def __len__(self):
      return len(self.dataset)
  
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 3 for calling the Processed obj's underlying member method code with example usage: obj.__len__() and returns: len