Xialong Liu

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...

Reach and Frequency (R&F) contract advertising is an important form of widely used brand advertising. Unlike performance advertising, R&F contracts emphasize controllable delivery of UV and PV under given targeting, scheduling, and frequency control constraints. In practical systems, advertisers...