class_docstr: Compound combiner for Utility analysis per partition metrics.
class_docstr_tok: ["Compound","combiner","for","Utility","analysis","per","partition","metrics","."]
code: def _merge_dense(self, acc1, acc2):
      if acc1 is None:
          return acc2
      if acc2 is None:
          return acc1
      return super().merge_accumulators(acc1, acc2)
  
imports: import abc
  import copy
  from dataclasses import dataclass
  from typing import Any, List, Optional, Tuple
  import numpy
  import math
  import pipeline_dp
  from pipeline_dp import budget_accounting
  from pipeline_dp import dp_computations
  from analysis import metrics
  from analysis import poisson_binomial
  from pipeline_dp import partition_selection
label_desc: Use image node_id 4 for calling the CompoundCombiner obj's underlying member method code with example usage: obj._merge_dense(acc1, acc2) and returns: super, acc2, acc1