message: Fix garbled comment.
diff: @@ -114,9 +114,8 @@ def _known_len_tf_for_stmt(iter_, extra_test, body, init_state):
  n = py_builtins.len_(iter_)
  # TODO(b/117628877): Revisit performance once XLA has the necessary support.
  - # Note: using a TensorArray creates an extra copy, but in turn it may speed up
  - # gradient calculations, which at the time of this writing use a less
  - # efficient concat op.
  + # Note: using a TensorArray creates an extra copy, but can calculate
  + # gradients more efficiently than StridedSlice.
  ta = tensor_array_ops.TensorArray(iter_.dtype, size=n)
  iter_ = ta.unstack(iter_)
  