fix for failure

    classification_metric = dc.metrics.Metric(

      dc.metrics.accuracy_score, verbosity=verbosity, task_averager=np.mean)

    tensorflow_model = dc.models.TensorflowLogisticRegression(

        n_tasks, n_features, learning_rate=0.5 weight_init_stddevs=[.01],

        n_tasks, n_features, learning_rate=0.5, weight_init_stddevs=[.01],

        batch_size=n_samples, verbosity=verbosity)

    model = dc.models.TensorflowModel(tensorflow_model)