def save_dt_model(model_name, model, folder):
    """
    Save model using Pickle binary format.

    :param dataframe model: model reference
    :param string model_name: title for the model used on the output filename
    :param string folder: location of model output
    """
    print("Saving model...")
    model_file = folder + '/models/' + model_name + '.pkl'
    path = open(model_file, 'wb')
    pickle.dump(model, path)
    print("Model saved location:", model_file)