def get_keywords_prefix(model):
    """
    Return the correct keyword's file prefix given the model
    :param model: name of the model
    :return: keyword's file prefix
    """
    if model == "cyclerank" or model == "cyclerank_pageviews":
        return "keywords_cyclerank"
    elif model == "pagerank" or model == "pagerank_pageviews":
        return "keywords_pagerank"
    else:
        return "keywords"