code: def _random_cdf(size):
      boundaries = np.cumsum(np.random.randint(0, 2, size=size + 1))
      counts = np.cumsum(np.random.random_sample(size=size + 1))
      return boundaries, counts
  
imports: from typing import List
  from absl.testing import absltest
  from absl.testing import parameterized
  import numpy
  from tensorflow_data_validation.utils import quantiles_util
  from google.protobuf import text_format
  from tensorflow_metadata.proto.v0 import statistics_pb2
label_desc: Use image node_id 4 for calling a global function with example usage: _random_cdf(size) and returns: boundaries,  counts