code: def _createFixedLengthRecordFiles(self):
      filenames = []
      for i in range(self._num_files):
          fn = os.path.join(
              self.get_temp_dir(), "fixed_length_record.%d.txt" % i
          )
          filenames.append(fn)
          with open(fn, "wb") as f:
              for j in range(self._num_records):
                  f.write(self._fixed_length_record(j, i))
      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 8 for calling the AutoShardDatasetTest obj's underlying member method code with example usage: obj._createFixedLengthRecordFiles() and returns: filenames