code: def __getitem__(self, idx):
      return {
          "input_ids": self.input_ids[idx],
          "attention_mask": self.attention_mask[idx],
          "labels": self.input_ids[idx],
      }
  
imports: import json
  import random
  from typing import Iterator, Optional
  import numpy
  import torch
  from torch.distributed import ProcessGroup
  from torch.distributed.distributed_c10d import _get_default_group
  from torch.utils.data import DataLoader, Dataset, DistributedSampler
  from colossalai.utils import get_current_device
label_desc: Use image node_id 3 for calling the RandomDataset obj's underlying member method code with example usage: obj.__getitem__(idx) and returns: dict