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DCN V2: Improved Deep & Cross Network and Practical Lessons for Web-scale Learning to Rank Systems

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arxiv 2008.13535 v2 pith:FLQXW6L6 submitted 2020-08-19 cs.IR cs.LGstat.ML

DCN V2: Improved Deep & Cross Network and Practical Lessons for Web-scale Learning to Rank Systems

classification cs.IR cs.LGstat.ML
keywords featurelearningdcn-v2crosscrossesdeepimprovednetwork
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Learning effective feature crosses is the key behind building recommender systems. However, the sparse and large feature space requires exhaustive search to identify effective crosses. Deep & Cross Network (DCN) was proposed to automatically and efficiently learn bounded-degree predictive feature interactions. Unfortunately, in models that serve web-scale traffic with billions of training examples, DCN showed limited expressiveness in its cross network at learning more predictive feature interactions. Despite significant research progress made, many deep learning models in production still rely on traditional feed-forward neural networks to learn feature crosses inefficiently. In light of the pros/cons of DCN and existing feature interaction learning approaches, we propose an improved framework DCN-V2 to make DCN more practical in large-scale industrial settings. In a comprehensive experimental study with extensive hyper-parameter search and model tuning, we observed that DCN-V2 approaches outperform all the state-of-the-art algorithms on popular benchmark datasets. The improved DCN-V2 is more expressive yet remains cost efficient at feature interaction learning, especially when coupled with a mixture of low-rank architecture. DCN-V2 is simple, can be easily adopted as building blocks, and has delivered significant offline accuracy and online business metrics gains across many web-scale learning to rank systems at Google.

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