code: def _tf2_callback():
      global CsvDataset, SqlDataset, make_batched_features_dataset, make_csv_dataset
      if tf2.enabled():
          CsvDataset = CsvDatasetV2
          SqlDataset = SqlDatasetV2
          make_batched_features_dataset = (
              make_batched_features_dataset_v2
          )
          make_csv_dataset = make_csv_dataset_v2
      else:
          CsvDataset = CsvDatasetV1
          SqlDataset = SqlDatasetV1
          make_batched_features_dataset = (
              make_batched_features_dataset_v1
          )
          make_csv_dataset = make_csv_dataset_v1
  
imports: import collections
  import csv
  import functools
  import gzip
  import numpy
  from tensorflow.python import tf2
  from tensorflow.python.compat import v2_compat
  from tensorflow.python.data.experimental.ops import error_ops
  from tensorflow.python.data.experimental.ops import parsing_ops
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.data.ops import map_op
  from tensorflow.python.data.ops import options
  from tensorflow.python.data.ops import readers
  from tensorflow.python.data.util import convert
  from tensorflow.python.data.util import nest
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor_spec
  from tensorflow.python.framework import tensor_util
  from tensorflow.python.lib.io import file_io
  from tensorflow.python.ops import gen_experimental_dataset_ops
  from tensorflow.python.ops import io_ops
  from tensorflow.python.platform import gfile
  from tensorflow.python.util.tf_export import tf_export
label_desc: Use image node_id 16 for calling a global function with example usage: _tf2_callback() without return types