message: adds missing "pass" to empty method in tf.contrib.learn.DNNClassifier doc
diff: @@ -245,7 +245,9 @@ class DNNClassifier(estimator.Estimator):
  def input_fn_eval: # returns x, y (where y represents label's class index).
  pass
  estimator.evaluate(input_fn=input_fn_eval)
  +
  def input_fn_predict: # returns x, None
  + pass
  # predict_classes returns class indices.
  estimator.predict_classes(input_fn=input_fn_predict)
  ```
  