Michael Margaliot Tel Aviv University, Israel ©SHU TTER STOC K.CO M/GR EENB UTTE RFLY Distributed and Democratized Learning: Philosophy and Research Challenges Minh N. H. Nguyen, Shashi Raj Pandey, Kyi Thar, and Choong Seon Hong Kyung Hee University, SOUTH KOREA Nguyen H.Tran The University of Sydney, AUSTRALIA Mingzhe Chen Princeton University, USA Walid Saad Virginia Tech, USA and Kyung Hee University, SOUTH KOREA Digital Object Identifier 10.1109/MCI.2020.3039068 Date of current version: 12 January 2021 1556-603X/21©2021IEEE Corresponding Author: Choong Seon Hong (cshong@khu.ac.kr). FEBRUARY 2021 | IEEE COMPUTATIONAL INTELLIGENCE MAGAZINE 49http://www.SHUTTERSTOCK.COM/GREENBUTTERFLY