code: def _create_accumulator(self, probabilities, moments):
      return (probabilities, moments)
  
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 PartitionSelectionTest obj's underlying member method code with example usage: obj._create_accumulator(probabilities, moments) and returns: probabilities,  moments