协同过滤学习笔记（一）

import numpy as np users = {'zhangsan': {'book1': 2.0, 'book2': 3.5, 'book3': 4.0, 'book5': 3.0}, 'lisi': {'book1': 1.5, 'book3': 3.0, 'book4': 5.0}, 'wangwu': {'book2': 3.0, 'book4

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