class_docstr: Dataset to convert GPT tokens to text.
code: def __getitem__(self, idx):
      gpt_token_ids = self.gpt_dataset[idx]["text"].tolist()
      text = self.gpt_tokenizer.detokenize(gpt_token_ids)
      return {"text": text}
  
file_path: megatron-lm/tools/retro/utils.py
imports: import os
  import torch
  import types
  from megatron import get_retro_args
  from megatron.tokenizer.tokenizer import _BertWordPieceTokenizer, _GPT2BPETokenizer, _GPTSentencePieceTokenizer
label_desc: Use image node_id 3 for calling the GPTToTextDataset obj's underlying member method code with example usage: obj.__getitem__(idx) and returns: dict