Chaokun Wang


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Knowledge Distillation based Contextual Relevance Matching for E-commerce Product Search
Ziyang Liu | Chaokun Wang | Hao Feng | Lingfei Wu | Liqun Yang
Proceedings of the 2022 Conference on Empirical Methods in Natural Language Processing: Industry Track

Online relevance matching is an essential task of e-commerce product search to boost the utility of search engines and ensure a smooth user experience. Previous work adopts either classical relevance matching models or Transformer-style models to address it. However, they ignore the inherent bipartite graph structures that are ubiquitous in e-commerce product search logs and are too inefficient to deploy online. In this paper, we design an efficient knowledge distillation framework for e-commerce relevance matching to integrate the respective advantages of Transformer-style models and classical relevance matching models. Especially for the core student model of the framework, we propose a novel method using k-order relevance modeling. The experimental results on large-scale real-world data (the size is 6 174 million) show that the proposed method significantly improves the prediction accuracy in terms of human relevance judgment. We deploy our method to online search platform. The A/B testing results show that our method significantly improves most business metrics under price sort mode and default sort mode.