code: def home(root: Optional[str] = None) -> str:
      if root is not None:
          _iru._HOME = root
          return _iru._HOME
  
      root = os.getenv("TORCHVISION_DATASETS_HOME")
      if root is not None:
          return root
  
      return _iru._HOME
  
imports: import os
  from typing import Optional
  import torchvision._internally_replaced_utils
label_desc: Use image node_id 1 for calling a global function with example usage: home(root) and returns: _iru, _iru, root