Publication： Papers submitted to WBDE 2021 will be peer reviewed by the conference committees, and accepted papers will be published in Lecture Notes on Data Engineering and Communications Technologies by Springer, which will be indexed by Scopus, EI Compendex, Inspec and submitted for consideration in Web of Science. Selected papers after being extended will be recommended to International Journal of Machine Learning and Computing for publication, which will be indexed by Inspec, Google Scholar, Crossref, ProQuest, Electronic Journals Library, etc.