code: def _get_default_pre_aggregated_extractors(
      self,
  ) -> pipeline_dp.PreAggregateExtractors:
      return pipeline_dp.PreAggregateExtractors(
          partition_extractor=lambda x: x[0],
          preaggregate_extractor=lambda x: x[1],
      )
  
file_path: pipelinedp/analysis/tests/utility_analysis_engine_test.py
imports: from absl.testing import absltest
  from absl.testing import parameterized
  from unittest.mock import patch
  import copy
  import pipeline_dp
  from pipeline_dp import budget_accounting
  from analysis import utility_analysis_engine
  from analysis import metrics
  import analysis
label_desc: Use image node_id 2 for calling the UtilityAnalysisEngineTest obj's underlying member method code with example usage: obj._get_default_pre_aggregated_extractors() and returns: pipeline_dp