Damien Querlioz

Memory-Centric Artificial Intelligence

Speaker: Damien Querlioz

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Damien Querlioz is a CNRS Researcher at the Centre de Nanosciences et de Nanotechnologies of Université Paris-Saclay. His research focuses on novel usages of emerging non-volatile memory and other nanodevices, in particular relying on inspirations from biology and machine learning. He received his predoctoral education at Ecole Normale Supérieure, Paris and his PhD from Université Paris-Sud in 2009. Before his appointment at CNRS, he was a Postdoctoral Scholar at Stanford University and at the Commissariat a l'Energie Atomique. Damien Querlioz is the coordinator of the interdisciplinary INTEGNANO research group, with colleagues working on all aspects of nanodevice physics and technology, from materials to systems. He is a member of the bureau of the French Biocomp research network. He has co-authored one book, nine book chapters, more than 100 journal articles, and conference proceedings, and given more than 50 invited talks at national and international workshops and conferences. In 2016, he was the recipient of an ERC Starting Grant to develop the concept of natively intelligent memory. In 2017, he received the CNRS Bronze medal. He has also been a co-recipient of the 2017 IEEE Guillemin-Cauer Best Paper Award and of the 2018 IEEE Biomedical Circuits and Systems Best Paper Award.

When performing artificial intelligence tasks, central and graphics processing units consume considerably more energy for moving data between logic and memory units than for doing actual arithmetic. Brains, by contrast, achieve superior energy efficiency by fusing logic and memory entirely, performing a form of “in-memory” computing. Currently emerging memory nanodevices such as (mem)resistive, phase change, and magnetic memories give us an opportunity to achieve similar tight integration between logic and memory. In this talk, we will look at neuroscience inspiration to extract lessons on the design of in-memory computing systems. We will first study the reliance of brains on approximate memory Continue reading strategies, which can be reproduced for artificial intelligence. We will give the example of a hardware binarized neural network relying on resistive memory. Binarized neural networks are a class of deep neural networks discovered in 2016, which can achieve state-of-the-art performance with a highly reduced memory and logic footprint with regards to conventional artificial intelligence approaches. Based on measurements on a hybrid CMOS and resistive hafnium oxide memory chip exploiting a differential approach, we will see that such systems can exploit the properties of emerging memories without the need for error-correcting codes, and achieve extremely high energy efficiency. Then, we will present a second approach where the probabilistic nature of emerging memories, instead of being mitigated, can be fully exploited to implement a type of probabilistic learning. We show that the inherent variability in hafnium oxide memristors can naturally implement the sampling step in the Metropolis-Hastings Markov Chain Monte Carlo algorithm, and train experimentally an array of 16,384 memristors to recognize images of cancerous tissues using this technique. These results highlight the interest in understanding and embracing the unreliable nature of emerging devices in artificial intelligence designs.

Ali Zadeth

COTS domain combined with ultra deep sub micron technologies with focus on radiation issues in space

Speaker: Ali Zadeh

ESA – European Space Agency
Head of the Data Systems, Microelectronics and Component Technology Division (TEC-ED)
Electrical Department (TEC-E)
Directorate of Technology, Engineering & Quality (D/TEC)