code: def __getitem__(self, item):
      return self.data[item]
  
imports: import copy
  import math
  import os
  import torch
  import torch.nn
  import torch.nn.functional
  from torch.utils.data import Dataset, DataLoader
label_desc: Use image node_id 3 for calling the ListDataset obj's underlying member method code with example usage: obj.__getitem__(item) and returns: self