Semantic Ads Retrieval at Walmart eCommerce with Language Models Progressively Trained on Multiple Knowledge Domains. - Zhaodong Wang; Weizhi Du; Md Omar Faruk Rokon; Pooshpendu Adhikary; Yanbing Xue; Jiaxuan Xu; Jianghong Zhou; Kuang-chih Lee; Musen Wen (CoRR, 2025)