code: def __getitem__(self, index):
      return self.data[index]
  
imports: from typing import Optional
  import torch
  from pytorch_lightning import LightningDataModule, LightningModule
  from torch.utils.data import DataLoader, Dataset, Subset
label_desc: Use image node_id 2 for calling the RandomDataset obj's underlying member method code with example usage: obj.__getitem__(index) and returns: self