code: def __getitem__(self, idx):
      return self.transform_fn(self.dataset[idx])
  
imports: import os
  import random
  import torch
  import torchaudio
  from pytorch_lightning import LightningDataModule
label_desc: Use image node_id 2 for calling the TransformDataset obj's underlying member method code with example usage: obj.__getitem__(idx) and returns: self