class_docstr: a caliban base image spec
class_docstr_tok: ["a","caliban","base","image","spec"]
code: def tag(self) -> str:
      parts = []
      if self.image_type == ImageType.CPU:
          parts = [_CPU_TAG, self.base_image, self.cpu_version]
      else:
          parts.append(_GPU_TAG)
          if self.image_type == ImageType.GPU_BASE:
              parts += ["base", self.base_image, self.gpu_version]
          else:
              parts += [
                  self.base_image,
                  self.cpu_version,
                  self.gpu_version,
              ]
  
      return f"{FLAGS.base_url}:" + "-".join(parts)
  
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 2 for calling the ImageSpec obj's underlying member method code with example usage: obj.tag() and returns: unknown