code: def maybe_download(self):
      path = Path(self.filename)
      if path.exists() and file_hash(path) == self.md5:
          return
      else:
          self.download()
  
file_path: finetune/finetune/datasets/__init__.py
imports: import hashlib
  from io import StringIO
  import os.path
  from pathlib import Path
  import requests
  import pandas
label_desc: Use image node_id 3 for calling the Dataset obj's underlying member method code with example usage: obj.maybe_download() without return types