code: def test_duplicate_hparam_names_from_two_objects(self):
      hparams = {
          hp.HParam("foo"): 1,
          hp.HParam("foo"): 1,
      }
      with self.assertRaisesRegex(
          ValueError, "multiple values specified for hparam 'foo'"
      ):
          _keras.Callback(self.get_temp_dir(), hparams)
  
file_path: tensorboard/tensorboard/plugins/hparams/_keras_test.py
imports: import os
  from unittest import mock
  from google.protobuf import text_format
  import tensorflow
  from tensorboard.plugins.hparams import _keras
  from tensorboard.plugins.hparams import metadata
  from tensorboard.plugins.hparams import plugin_data_pb2
  from tensorboard.plugins.hparams import summary_v2
label_desc: Use image node_id 9 for calling the CallbackTest obj's underlying member method code with example usage: obj.test_duplicate_hparam_names_from_two_objects() without return types