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Simhash

文本去重，生成十进制数，转化成64位哈希码，不足头部添'0'补足

海明距离一般为3（经验值）

python2的情况下直接调用simhash文件夹里的包(提出来的话，有些情况下算的哈希值不对--还不知道为什么)，python3可以直接把算法核心提出来使用

为了稳，直接调用就好了！！！

这个算法在实际项目中，并不理想，还需要定制核心算法！目前去掉了排序...还可以修改权重..

优化了，数字权重、匹配规则等...

目前抽查效果还可以...

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