code: def RunMetadata(self, run, tag):
      
      accumulator = self.GetAccumulator(run)
      return accumulator.RunMetadata(tag)
docs: Get the session.run() metadata associated with a TensorFlow run and tag.
  
      Args:
        run: A string name of a TensorFlow run.
        tag: A string name of the tag associated with a particular session.run().
  
      Raises:
        KeyError: If the run is not found, or the tag is not available for the
          given run.
  
      Returns:
        The metadata in the form of `RunMetadata` protobuf data structure.