message: [tf.data] Increase default buffer size to 256 MB
diff: @@ -29,8 +29,7 @@ from tensorflow.python.ops import gen_experimental_dataset_ops as ged_ops
  from tensorflow.python.util.tf_export import tf_export
  -# TODO(b/64974358): Increase default buffer size to 256 MB.
  -_DEFAULT_READER_BUFFER_SIZE_BYTES = 256 * 1024 # 256 KB
  +_DEFAULT_READER_BUFFER_SIZE_BYTES = 256 * 1024 * 1024 # 256 MB
  def _create_or_validate_filenames_dataset(filenames):
  