Hongfei Lin - Information Retrieval: 27th China Conference, CCIR 2021, Dalian, China, October 29–31, 2021, Proceedings

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The 2021 China Conference on Information Retrieval (CCIR 2021), co-organized by the Chinese Information Processing Society of China (CIPS) and the Chinese Computer Federation (CCF), was the 27th installment of the conference series. The conference was hosted by Dalian University of Foreign Languages in Dalian, Liaoning, China, during October 2931, 2021.

The annual CCIR conference serves as the major forum for researchers and practitioners from both China and other Asian countries/regions to share their ideas, present new research results, and demonstrate new systems and techniques in the broad field of information retrieval (IR). Since CCIR 2017, the conference has enjoyed contributions spanning the theory and application of IR, both in English and Chinese.

This year we received a total of 124 submissions from both China and other Asian countries. Each submission was carefully reviewed by at least three domain experts, and the Program Committee (PC) chairs made the final decisions. We accepted 72, among which 15 were English papers and 57 were Chinese papers. The final English program of CCIR 2021 featured 15 papers.

CCIR 2021 included abundant academic activities. Besides keynote speeches delivered by world-renowned scientists from China and abroad, and traditional paper presentation sessions and poster sessions, we also hosted a young scientist forum, an evaluation workshop, and tutorials on frontier research topics. We also invited authors from related international conferences (such as SIGIR and CIKM) to share their research results as well. CCIR 2021 featured four keynote speeches by James Allen (University of Massachusetts Amherst), Si Wu (Peking University), Jun Wang (UCL), and Zhongyuan Wang (Meituan Inc.).

The conference and program chairs of CCIR 2021 extend their sincere gratitude to all authors and contributors to this years conference. We are also grateful to the PC members for their reviewing effort, which guaranteed that CCIR 2021 could feature a quality program of original and innovative research in IR. Special thanks go to our sponsors for their generosity: Meituan Inc., Huawei Inc., and Baidu Inc.