code: def _createTextFiles(self):
      filenames = []
      for i in range(self._num_files):
          fn = os.path.join(self.get_temp_dir(), "text_line.%d.txt" % i)
          filenames.append(fn)
          contents = []
          for j in range(self._num_records):
              contents.append(self._text_line(j, i))
              if j + 1 != self._num_records or i == 0:
                  contents.append(b"\r\n")
          contents = b"".join(contents)
  
          with open(fn, "wb") as f:
              f.write(contents)
      return filenames
  
imports: import os
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.data.ops import readers
  from tensorflow.python.data.util import structure
  from tensorflow.python.distribute import input_ops
  from tensorflow.python.eager import context
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import test_util
  from tensorflow.python.lib.io import python_io
  from tensorflow.python.ops import gen_dataset_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.platform import test
  from tensorflow.python.util import compat
label_desc: Use image node_id 7 for calling the AutoShardDatasetTest obj's underlying member method code with example usage: obj._createTextFiles() and returns: filenames