code: def tag(self) -> str:
      return f"{self.base_image}-{self.gpu}"
  
imports: from absl import flags, app, logging
  from copy import copy
  from typing import Dict, List, Any, NamedTuple, Optional, Set
  from enum import Enum
  import json
  import pprint
label_desc: Use image node_id 1 for calling the GpuBase obj's underlying member method code with example usage: obj.tag() and returns: self, str, self