message: Fix docstring.
  This is breaking everything below it.
diff: @@ -171,7 +171,7 @@ class IODataset(io_dataset.IODataset):
  In case numpy file consists of unnamed elements, a tuple of numpy
  arrays are returned, otherwise a dict is returned for named
  elements.
  - ```
  +
  Args:
  filename: filename of numpy file (npy or npz).
  spec: A tuple of tf.TensorSpec or dtype, or a dict of
  