Title:

Distributed Learning and Inference over Wireless Channels

Time: Thursday, May 4th 2023, 9:00 – 10:00

 

Abstract:

We consider collaborative machine learning (ML) systems where a massive dataset is distributed across independent workers which compute their local gradient estimates based on their own datasets. Workers send their estimates through a fading multipath channel with orthogonal frequency division multiplexing to mitigate the frequency selectivity of the channel. We consider practical limitations including the use of finite resolution analog-to-digital converters and digital-to-analog converters as well as time variations of the wireless channel. We show that these limitations do not prevent the convergence of the learning algorithms, and the multipath channel effects vanish when the number of antennas is sufficient at the PS. As an extension of the basic framework, we study hierarchical federated learning over wireless links and federated learning with energy harvesting devices as well. Finally, as a related but different concept, we propose an over-the-air combining solution for multi-sensor wireless inference.

 

Biography:

Tolga M. Duman is a Professor of the Electrical and Electronics Engineering Department at Bilkent University, in Turkey. He received the B.S. degree from Bilkent University, Ankara, Turkey, in 1993, and the M.S. and Ph.D. degrees from Northeastern University, Boston, MA, USA, in 1995 and 1998, respectively, all in electrical engineering. Prior to joining Bilkent University in September 2012, he was a full professor with the School of ECEE at Arizona State University. Dr. Duman’s current research interests are in systems, with particular focus on communications and signal processing, including wireless and mobile communications, channel coding/modulation, coding for wireless communications, information theory and data storage systems, as well as machine learning for communications and semantic communications/signal processing.

Dr. Duman is an IEEE Fellow and a member of the Science Academy of Turkey. He is a recipient of the U.S. National Science Foundation CAREER Award, the IEEE Third Millennium medal, and a European Research Council (ERC) Advanced Grant. He served on the editorial board of various journals including IEEE Trans. on Wireless Communications and IEEE Communications Surveys and Tutorials, and he is currently the Editor-in-Chief of the IEEE Transactions on Communications.