但是如果分别计算两个模型的AUC,那么模型A的AUC值为0.883,模型B的AUC值为0.667。这时候我们发现AUC在当前场景下不准了,针对这种情况阿里妈妈团队提出了Group AUC作为评价指标。GAUC会先计算各个用户自己的AUC,然后加权平均,GAUC公式如下所示: 图17 GAUC计算公式 实际计算时我们还可以将权重设置为每个用户浏览或者点击的...
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在CTR预估场景,最重要的就是能够准确表达用户的兴趣,DIN就是为了能够准确刻画用户兴趣而产生的,阿里的模型大概经过了从历史点击sum pooling,到特征组合,再到Attention(DIN中使用的结构)的过程。 2.1 用户兴趣表达:历史点击sum pooling 在DIN之前,阿里还出过一个CTR预估模型:GwEN(group-wise embedding network),在DIN...
文章首先介绍了现有的点击率 (CTR) 预估模型大都满足相同的模式: 先将大量的稀疏类别特征 (Categorical Features) 通过 Embedding 技术映射到低维空间, 再将这些特征的低维表达按照特征的类别进行组合与变换 (文中采用 in a group-wise manner 来描述), 以形成固定长度的向量 (比如常用的 sum pooling / mean poo...
(WRC). His groundbreaking research and expertise make him the perfect fit for these critical roles. Dr. Gamal El-Din's commitment to education and research is unparalleled. Over the course of two decades, he has supervised...
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About the Dins The Harvard Din & Tonics are Harvard University’s signature jazz a cappella group, known for their rich tradition of musical and performance excellence. Their repertoire centers around American jazz standards, but also frequently includes pop, disco, and folk music. These world-tour...
2、将不同group的特征concate起来之后得到一个固定长度的向量 3、将此向量喂给后续的全连接网络,最后输出 Top~~ 二、DIN模型 1、特征处理 参考论文 Learning piece-wise linear models from large scale data for ad click prediction 中common feature trick,目的是降低空间开销和计算开销。
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但是如果分别计算两个模型的AUC,那么模型A的AUC值为0.883,模型B的AUC值为0.667。这时候我们发现AUC在当前场景下不准了,针对这种情况阿里妈妈团队提出了Group AUC作为评价指标。GAUC会先计算各个用户自己的AUC,然后加权平均,GAUC公式如下所示: 图17 GAUC计算公式 ...