code: def _create_combiner(self) -> combiners.CompoundCombiner:
      mechanism_spec, params = _create_combiner_params_for_count()
      count_combiner = combiners.CountCombiner(mechanism_spec, params)
      return combiners.CompoundCombiner(
          [count_combiner], return_named_tuple=False
      )
  
imports: import dataclasses
  import numpy
  from absl.testing import absltest
  from absl.testing import parameterized
  from unittest.mock import patch
  from typing import Tuple
  import pipeline_dp
  from analysis import per_partition_combiners
  from analysis import metrics
  from analysis.tests import common
label_desc: Use image node_id 1 for calling the UtilityAnalysisCompoundCombinerTest obj's underlying member method code with example usage: obj._create_combiner() and returns: combiners