class_docstr: DP sum combiner.
  
  It is just for demonstration how custom combiners API work.
class_docstr_tok: ["DP","sum","combiner",".","It","is","just","for","demonstration","how","custom","combiners","API","work","."]
code: def request_budget(self, budget_accountant):
      self._budget = budget_accountant.request_budget(
          pipeline_dp.MechanismType.LAPLACE
      )
  
imports: from absl import app
  from absl import flags
  from apache_beam.runners.portability import fn_api_runner
  import pyspark
  from examples.movie_view_ratings.common_utils import *
  import pipeline_dp
  import numpy
label_desc: Use image node_id 4 for calling the CountCombiner obj's underlying member method code with example usage: obj.request_budget(budget_accountant) without return types