class_docstr: Mini version of WikiText2.
class_docstr_tok: ["Mini","version","of","WikiText2","."]
code: def download(destination: Path) -> None:
      os.makedirs(destination.parent, exist_ok=True)
      url = "https://raw.githubusercontent.com/pytorch/examples/main/word_language_model/data/wikitext-2/train.txt"
      if os.path.exists(destination):
          return
      with open(destination, "w") as f:
          f.write(requests.get(url).text)
  
imports: import math
  import os
  from pathlib import Path
  from typing import Dict, List, Optional, Tuple
  import requests
  import torch
  import torch.nn
  import torch.nn.functional
  from torch import Tensor
  from torch.nn.modules import MultiheadAttention
  from torch.utils.data import DataLoader, Dataset
  from lightning.pytorch import LightningModule
label_desc: Use image node_id 5 for calling the WikiText2 obj's underlying member method code with example usage: obj.download(destination) without return types