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In particular, sequential dependence multi-task learning (SDMTL) faces challenges in dealing with complex task correlations and extracting valuable information in real-world scenarios, leading to negative transfer and a deterioration in the performance. Herein, a systematic learning paradigm of the SDMTL problem is established for the first time, which applies to more general multi-step conversion scenarios with longer conversion paths or various task dependence relationships. Meanwhile, an SDMTL architecture, named\n            <jats:italic>Task-Aware Feature Extraction<\/jats:italic>\n            (TAFE), is designed to enable the dynamic task representation learning from a sample-wise view. TAFE selectively reconstructs the implicit shared information corresponding to each sample case and performs the explicit task-specific extraction under dependence constraints, which can avoid the negative transfer, resulting in more effective information sharing and joint representation learning. Extensive experiment results demonstrate the effectiveness and applicability of the proposed theoretical and implementation frameworks. Furthermore, the online evaluations at MYbank showed that TAFE had an average increase of 9.22% and 3.76% in various scenarios on the post-view click-through &amp; conversion rate (CTCVR) estimation task. Currently, TAFE is deployed in an online platform to provide various traffic services.\n          <\/jats:p>","DOI":"10.1145\/3640468","type":"journal-article","created":{"date-parts":[[2024,1,12]],"date-time":"2024-01-12T11:16:06Z","timestamp":1705058166000},"page":"1-29","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Multi-Task Learning with Sequential Dependence Toward Industrial Applications: A Systematic Formulation"],"prefix":"10.1145","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6817-626X","authenticated-orcid":false,"given":"Xiaobo","family":"Guo","sequence":"first","affiliation":[{"name":"Institute of Information Science, Beijing Jiaotong University and Data Management Department, China Minsheng Bank, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2901-9608","authenticated-orcid":false,"given":"Mingming","family":"Ha","sequence":"additional","affiliation":[{"name":"Institute of Artificial Intelligence and School of Intelligence Science and Technology, University of Science and Technology Beijing and MYbank, Ant Group, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-9114-7668","authenticated-orcid":false,"given":"Xuewen","family":"Tao","sequence":"additional","affiliation":[{"name":"MYbank, Ant Group, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2949-668X","authenticated-orcid":false,"given":"Shaoshuai","family":"Li","sequence":"additional","affiliation":[{"name":"MYbank, Ant Group, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9326-9863","authenticated-orcid":false,"given":"Youru","family":"Li","sequence":"additional","affiliation":[{"name":"Institute of Information Science, Beijing Jiaotong University, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7315-3276","authenticated-orcid":false,"given":"Zhenfeng","family":"Zhu","sequence":"additional","affiliation":[{"name":"Institute of Information Science, Beijing Jiaotong University, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-9858-3040","authenticated-orcid":false,"given":"Zhiyong","family":"Shen","sequence":"additional","affiliation":[{"name":"Data Management Department, China Minsheng Bank, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Li","family":"Ma","sequence":"additional","affiliation":[{"name":"Legal Affairs and Compliance Department, China Minsheng Bank, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2024,2,28]]},"reference":[{"key":"e_1_3_2_2_2","unstructured":"Sami Abu-El-Haija Nisarg Kothari Joonseok Lee Paul Natsev George Toderici Balakrishnan Varadarajan and Sudheendra Vijayanarasimhan. 2016. 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