from tensorflow.contrib.learn.python.learn.estimators import run_config


    classifier.fit(input_fn=_train_input_fn, steps=15)
    classifier.evaluate(input_fn=_eval_input_fn, steps=1)
    classifier.export(self._export_dir_base)

  def testThatLeafIndexIsInPredictions(self):
    learner_config = learner_pb2.LearnerConfig()
    learner_config.num_classes = 2
    learner_config.constraints.max_tree_depth = 1
    model_dir = tempfile.mkdtemp()
    config = run_config.RunConfig()

    classifier = estimator.GradientBoostedDecisionTreeClassifier(
        learner_config=learner_config,
        num_trees=1,
        examples_per_layer=3,
        model_dir=model_dir,
        config=config,
        feature_columns=[contrib_feature_column.real_valued_column("x")],
        output_leaf_index=True)
