code: def _DefaultPartitionTransform(
      pcol, num_partitions
  ):  # pylint: disable=invalid-name
      """Ptransform wrapping _default_assign_to_partition."""
      return pcol | "DefaultPartition" >> beam.Map(
          _default_assign_to_partition, num_partitions
      )
  
imports: import collections
  import functools
  from typing import Dict, Iterable, Text, Tuple
  import apache_beam
  import numpy
  import pyarrow
  from tensorflow_data_validation import constants
  from tensorflow_data_validation import types
  from tensorflow_data_validation.statistics.generators import stats_generator
  from tensorflow_data_validation.utils import stats_util
  from tfx_bsl.arrow import table_util
  from tensorflow_metadata.proto.v0 import statistics_pb2
label_desc: Use image node_id 4 for calling a global function with example usage: _DefaultPartitionTransform(pcol, num_partitions) and returns: unknown