协同过滤算法，用python编写和检验，可用于推荐系统中的协同过滤推荐算法。文件包含数据库数据导入。产生模拟海面，进而进行计算模拟(Collaborative filtering algorithm, written and tested by python, can be used in the recommendation of collaborative filtering algorithm in the system. The file contains the database data import. The simulated sea surface is produced, and then the simulation is carried out.)