Kaiyuan Li

Learning-to-rank (LTR) is a fundamental component of modern large-scale information retrieval (IR) systems, playing an essential role across various stages of the ranking pipeline. Recently, differentiable sorting networks have attracted increasing attention for LTR as a permutation-level learnin...

The Auto-bidding plays a critical role in automating ad delivery. However, current bidding systems face two critical challenges: (i) sparse and uncertain conversions, especially the long conversion attribution latency caused by privacy policies, deep conversion paths, or marketing campaigns, coll...

Sales promotions, as short-term incentives to stimulate product purchases, play a pivotal role in modern e-commerce marketing strategies. During promotional events, user behavior patterns exhibit distinct characteristics compared to regular periods. Notably, in the pre-promotion phase, users typi...