message: Small doc fix in kfac loss_functions: `evaluate()` returns *negative* log probabilities.
diff: @@ -91,13 +91,13 @@ class LossFunction(object):
  @abc.abstractmethod
  def _evaluate(self, targets):
  - """Evaluates the log probability of the targets.
  + """Evaluates the negative log probability of the targets.
  Args:
  targets: Tensor that distribution can calculate log_prob() of.
  Returns:
  - log probability of each target, summed across all targets.
  + negative log probability of each target, summed across all targets.
  """
  pass
  