code: def _TagHelper(self, tag_name, enum):
      if tag_name not in self.Tags()[enum]:
          raise KeyError
      return ["%s/%s" % (self._path, tag_name)]
  
imports: import os
  import os.path
  import queue
  import shutil
  import tensorflow
  from tensorboard.backend.event_processing import plugin_event_accumulator
  from tensorboard.backend.event_processing import plugin_event_multiplexer
  from tensorboard.util import test_util
label_desc: Use image node_id 5 for calling the _FakeAccumulator obj's underlying member method code with example usage: obj._TagHelper(tag_name, enum) and returns: list