code: def _to_class_name(self) -> Optional[str]:
      if self.type.startswith("__torch__."):
          return self.type[len("__torch__.") :]
      elif self.type.startswith("__mutated__."):
          return self.type[len("__mutated__.") :]
      else:
          return None
  
imports: from typing import Any, Dict, List, Optional, cast
  from nni.common.framework import get_default_framework
label_desc: Use image node_id 4 for calling the PyTorchOperation obj's underlying member method code with example usage: obj._to_class_name() and returns: self, self, None