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","."]
docstr: Creates accumulator from 'values'.
docstr_tok: ["Creates","accumulator","from","'values","'","."]
code: def create_accumulator(self, values):
      """Creates accumulator from 'values'."""
      return len(values)
  
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 1 for calling the CountCombiner obj's underlying member method code with example usage: obj.create_accumulator(values) and returns: len