运行环境： python3.5(python2也可以，基本没啥改动) 结巴分词工具 pip3 install jieba
用法： 1.先运行GetIDF.py得到IDF(逆文档频率)（已训练好），无需再运行 2.输入参数，直接运行TF-IDF.py即可
注：该repo中提供的idf.txt由清华NLP组的新闻数据集训练获得。
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使用TF-IDF算法提取关键词[Extracting the key words with TF-IDF algorithm]
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