message: Remove a TODO that will never be done, thanks to backwards compatibility.
diff: @@ -348,7 +348,6 @@ def compute_gradient_error(x,
  as the initial value.
  delta: (optional) the amount of perturbation.
  init_targets: list of targets to run to initialize model params.
  - TODO(mrry): Remove this argument.
  extra_feed_dict: dict that allows fixing specified tensor values
  during the Jacobian calculation.
  