code: def _mock_list_hyperparameters(
      self,
      ctx,
      *,
      experiment_ids,
      limit,
  ):
      return self._hyperparameters
  
imports: import operator
  from unittest import mock
  import tensorflow
  from google.protobuf import text_format
  from tensorboard import context
  from tensorboard.data import provider
  from tensorboard.plugins import base_plugin
  from tensorboard.plugins.hparams import api_pb2
  from tensorboard.plugins.hparams import backend_context
  from tensorboard.plugins.hparams import metadata
  from tensorboard.plugins.hparams import plugin_data_pb2
label_desc: Use image node_id 4 for calling the BackendContextTest obj's underlying member method code with example usage: obj._mock_list_hyperparameters(ctx) and returns: self