利用python实现基于用户的协同过滤推荐，采用pearson相关系数计算相似度，加权平均预测分数-Users use python-based collaborative filtering recommendation, pearson correlation coefficient is calculated using the similarity, the weighted average prediction scores

计算词向量间的余弦相似度，用于语义文本挖掘 。(Calculate the cosine similarity between word vectors for semantic text mining.)

TOPSIS （Technique for Order Preference by Similarity to an Ideal Solution ）法是C.L.Hwang和K.Yoon于1981年首次提出，TOPSIS法根据有限个评价对象与理想化目标的接近程度进行排序的方法，是在现有的对象中进行相对优劣的评价。(The TOPSIS (Technique for Order Preference by Similarity to an Ideal Solution) method was fi

运用python进行模糊聚类分析步骤如下：建立数据矩阵；数据标准化；建立模糊相似矩阵；改造相似关系为等价关系；确定分类数(The steps of Python fuzzy clustering analysis are as follows: establishing data matrix; standardizing data; establishing fuzzy similarity matrix; transforming similarity relation into equiv