SVD算法不光可以用于降维算法中的特征分解，还可以用于推荐系统，以及自然语言处理等领域。是很多机器学习算法的基石。内含电影平分数据集(SVD algorithm can be used not only in feature decomposition of dimension reduction algorithm, but also in recommendation system, natural language processing and other fields. Is the cornerstone of many machine learning algorithms. Include movie bisection data set)