def jaccard(xs, ys):
    """
    Computes the Jaccard Similarity Coefficient
    :param xs: set containing all the words in the random paper
    :param ys: set containing all the words in the every paper
    :return: return the Jaccard index, how similar are both sets
    """
    return float(len(set(xs) & set(ys))) / len(set(xs) | set(ys))