code: def __init__(
      self, request_context, backend_context, experiment_id, request
  ):
      """Constructor.
  
      Args:
        request_context: A tensorboard.context.RequestContext.
        backend_context: A backend_context.Context instance.
        experiment_id: A string, as from `plugin_util.experiment_id`.
        request: A api_pb2.GetExperimentRequest instance.
      """
      self._request_context = request_context
      self._backend_context = backend_context
      self._experiment_id = experiment_id
      self._include_metrics = (
          # Metrics are included by default if include_metrics is not
          # specified in the request.
          not request.HasField("include_metrics")
          or request.include_metrics
      )
      self._hparams_limit = request.hparams_limit
  
label_desc: Use image node_id 1 to create a new Handler object  with example: obj = Handler(request_context, backend_context, experiment_id, request)