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【AI】Softmax函数

Softmax Advantage: Map the original output vector to a space of [0,1] Key word: Activation Function Usage: Normalize the output of a network to a probability distribution over predicted output classes. Used in multiclass classification problems. Form \[\begin{equation} P(y=j|x) = \frac{e^{x^Tw_j}}{\sum^K_{k=1}e^{x^Tw_k}} \end{equation}\]...

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【Ad】Recommendation System Overview(推荐系统详解)

Recommendation Algorithms Advantage: Efficient and effective. Usage: Recommendation Systems Collaborative Filtering User-based filtering 向用户推荐与他相似的用户感兴趣的物品。 基本步骤: 计算用户之间的相似度 根据相似度对用户进行评分 找到相似用户集合中其他用户感兴趣但是从未出现在该用户列表中的物品,推荐给该用户 相似度计算方法 余弦相似度,Cosine similarity 给定两个向量$A,B$,余弦相似性有点积和向量长度给出 \[\begin{equation} \...

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