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TF-IDF与余弦相似性的应用

余弦相似度的python实现：

def count_cos_similarity(vec_1, vec_2):
    if len(vec_1) != len(vec_2):
        return 0

    s = sum(vec_1[i] * vec_2[i] for i in range(len(vec_2)))
    den1 = math.sqrt(sum([pow(number, 2) for number in vec_1]))
    den2 = math.sqrt(sum([pow(number, 2) for number in vec_2]))
    return s / (den1 * den2)

参考：https://blog.csdn.net/m0_37693335/article/details/78617138