def sentiment_lable(score):
    """
    The function sentiment_lable() is to label the sentiment categories based on polarity score calculated by VADER model.
    :param score: float
    :return: string, sentiment label
    """
    if score >= 0.05:
        return 'positive'
    elif score <= -0.05:
        return 'negative'
    else:  # (compound score > -0.05) and (compound score < 0.05)
        return 'neutral/not applicable'