def get_set_sizes(df):
    """
    get sizes of training and test sets based on size of dataset.
    testing set: 10% of training set
    :return: training_set_size, testing_set_size
    """

    data_set_size = len(df.index)

    training_set_size = data_set_size * 0.9
    testing_set_size = data_set_size * 0.1

    return int(training_set_size), int(testing_set_size)