User-Based-Collaborative-Filtering-Recommender-system:实现一个简单的基于用户的协作过滤推荐系统，以使用给定的数据预测商品的评分。 该预测将使用k个最近邻居和Pearson相关进行。 最后，使用最近的k个邻居的相似性，预测给定用户对新商品的评分-源码

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