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Seminar on Approximate Computing by Prof. Kaushik Roy (Purdue) - June 23, 2015

posted Jun 18, 2015, 6:19 PM by Green IC group ‎(‎   [ updated Jun 18, 2015, 6:20 PM ]
DATE: 2-3:30PM June 23, 2015        LOCATION: E5-03-23 (Engineering Blk E5, Faculty of Engineering, NUS) @ NUS campus (map)
TITLE: Approximate Computing for Energy-efficient Error-resilient Multimedia Systems

In today’s world there is an explosive growth in digital information content. Moreover, there is also a rapid increase in the number of users of multimedia applications related to image and video processing, recognition, mining and synthesis. These facts pose an interesting design challenge to process digital data in an energy-efficient manner while catering to desired user quality requirements. Most of these multimedia applications possess an inherent quality of "error"-resilience. This means that there is considerable room for allowing approximations in intermediate computations, as long as the final output meets the user quality requirements. This relaxation in "accuracy" can be used to simplify the complexity of computations at different levels of design abstraction, which directly helps in reducing the power consumption. At the algorithm and architecture levels, the computations can be divided into significant and non-significant. Significant computations have a greater impact on the overall output quality, compared to non-significant ones. Thus the underlying architecture can be modified to promote faster computation of significant components, thereby enabling voltage-scaling (at the same operating frequency). At the logic and circuit levels, one can relax Boolean equivalence to reduce the number of transistors and decrease the overall switched capacitance. This can be done in a controlled manner to introduce limited approximations in common mathematical operations like addition and multiplication. All these techniques can be classified under the general topic of “Approximate Computing”, which is the main focus of this talk.

Kaushik Roy received B.Tech. degree in electronics and electrical communications engineering from the Indian Institute of Technology, Kharagpur, India, and Ph.D. degree from the electrical and computer engineering department of the University of Illinois at Urbana-Champaign in 1990. He was with the Semiconductor Process and Design Center of Texas Instruments, Dallas, where he worked on FPGA architecture development and low-power circuit design. He joined the electrical and computer engineering faculty at Purdue University, West Lafayette, IN, in 1993, where he is currently Edward G. Tiedemann Jr. Distinguished Professor. His research interests include spintronics, device-circuit co-design for nano-scale Silicon and non-Silicon technologies, low-power electronics for portable computing and wireless communications, and new computing models enabled by emerging technologies. Dr. Roy has published more than 600 papers in refereed journals and conferences, holds 15 patents, graduated 65 PhD students, and is co-author of two books on Low Power CMOS VLSI Design (John Wiley & McGraw Hill). 

Dr. Roy received the National Science Foundation Career Development Award in 1995, IBM faculty partnership award, ATT/Lucent Foundation award, 2005 SRC Technical Excellence Award, SRC Inventors Award, Purdue College of Engineering Research Excellence Award, Humboldt Research Award in 2010, 2010 IEEE Circuits and Systems Society Technical Achievement Award, Distinguished Alumnus Award from Indian Institute of Technology (IIT), Kharagpur, Fulbright-Nehru Distinguished Chair, DoD National Security Science and Engineering Faculty Fellow (2014-2019), and best paper awards at 1997 International Test Conference, IEEE 2000 International Symposium on Quality of IC Design, 2003 IEEE Latin American Test Workshop, 2003 IEEE Nano, 2004 IEEE International Conference on Computer Design, 2006 IEEE/ACM International Symposium on Low Power Electronics & Design, and 2005 IEEE Circuits and system society Outstanding Young Author Award (Chris Kim), 2006 IEEE Transactions on VLSI Systems best paper award, 2012 ACM/IEEE International Symposium on Low Power Electronics and Design best paper award, 2013 IEEE Transactions on VLSI Best paper award. Dr. Roy was a Purdue University Faculty Scholar (1998-2003). He was a Research Visionary Board Member of Motorola Labs (2002) and held the M.K. Gandhi Distinguished Visiting faculty at Indian Institute of Technology (Bombay). He has been in the editorial board of IEEE Design and Test, IEEE Transactions on Circuits and Systems, IEEE Transactions on VLSI Systems, and IEEE Transactions on Electron Devices. He was Guest Editor for Special Issue on Low-Power VLSI in the IEEE Design and Test (1994) and IEEE Transactions on VLSI Systems (June 2000), IEE Proceedings -- Computers and Digital Techniques (July 2002), and IEEE Journal on Emerging and Selected Topics in Circuits and Systems (2011). Dr. Roy is a fellow of IEEE.
Green IC group (,
Jun 18, 2015, 6:19 PM