TotalRecall: A Bidirectional Candidates Generation Framework for Large Scale Recommender \& Advertising Systems

29 Sep 2021  ·  Qifang Zhao, Yu Jiang, Yuqing Liu, Meng Du, Qinghui Sun, Chao Xu, Huan Xu, Zhongyao Wang ·

Recommender (RS) and Advertising/Marketing Systems (AS) play the key roles in E-commerce companies like Amazaon and Alibaba. RS needs to generate thousands of item candidates for each user ($u2i$), while AS needs to identify thousands or even millions of high-potential users for given items so that the merchant can advertise these items efficiently with limited budget ($i2u$). This paper proposes an elegant bidirectional candidates generation framework that can serve both purposes all together. Besides, our framework is also superior in these aspects: $i).$ Our framework can easily incorporate many DNN-architectures of RS ($u2i$), and increase the HitRate and Recall by a large margin. $ii).$ We archive much better results in $i2u$ candidates generation compare to strong baselines. $iii).$ We empirically show that our framework can diversify the generated candidates, and ensure fast convergence to better results.

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