text: sqlflow> SELECT *
  FROM iris.train
  TO TRAIN DNNClassifier
  WITH
    n_classes = 3,
    hidden_units = [10, 20]
  COLUMN sepal_length, sepal_width, petal_length, petal_width
  LABEL class
  INTO sqlflow_models.my_dnn_model;
  -----------------------------
  2018/12/16 15:03:54 sqlflowCmd: run in Docker container
  Job success
  