code: def __getitem__(self, index):
      return {
          "input_ids": self.data[index],
          "attention_mask": self.attention_mask[index],
      }, self.data[index]
  
file_path: ColossalAI/examples/language/gpt/titans/dataset/webtext.py
imports: import json
  import os
  from typing import Optional
  import torch
  from torch.utils.data import Dataset
  from transformers import GPT2Tokenizer
  from colossalai.legacy.registry import DATASETS
label_desc: Use image node_id 3 for calling the WebtextDataset obj's underlying member method code with example usage: obj.__getitem__(index) and returns: dict,  self