code: def __getitem__(self, idx):
      return self.data[idx]
  
imports: import torch
  import argparse
  import os
  import logging
  import time
  from torch import nn
  from contextlib import nullcontext
  from datasets import load_dataset
  from torch.utils.data import DataLoader
  from torch.utils.data.distributed import DistributedSampler
  import torch.distributed
  from transformers import BertTokenizer, BertModel, AdamW
label_desc: Use image node_id 4 for calling the Dataset obj's underlying member method code with example usage: obj.__getitem__(idx) and returns: self