binary retrieval

Alimama Tech

Mar 23, 2022 · Artificial Intelligence

Advancements in Keyword Recall for Search Advertising: From Binary Retrieval to Hierarchical Bidding Graph

The paper reports a year‑long evolution of Alibaba’s search‑advertising keyword recall, replacing the traditional two‑stage rewrite‑and‑score pipeline with a low‑storage binary retrieval model and then a joint recall framework built on a hierarchical bidding graph, delivering near‑full‑precision recall, 16× memory savings, and quota‑free global ranking.