Abstract: Scientific data sets are diverse and often require data-set-specific deep neural network (DNN) models. Nevertheless, designing high-performing DNN architecture for a given data set is an expert-driven, time-consuming, trial-and-error manual task. To that end, we have developed DeepHyper [1], a software package that uses scalable neural architecture and hyperparameter search to automate the design and development of DNN models for scientific and engineering applications. In this talk, we will present our recent work on an automated approach for generating an ensemble of DNNs with DeepHyper at scale and using them for estimating data (aleatoric) and model (epistemic) uncertainties for a wide range of scientific applications.
[1] DeepHyper

Bio: Prasanna Balaprakash is a computer scientist with a joint appointment in the Mathematics and Computer Science Division and the Leadership Computing Facility at Argonne National Laboratory. His research work spans the areas of artificial intelligence, machine learning, optimization, and high-performance computing. He is a recipient of the U.S. Department of Energy 2018 Early Career Award. Prior to Argonne, he worked as a Chief Technology Officer at Mentis Sprl, a machine learning startup in Brussels, Belgium. He received his PhD from CoDE-IRIDIA, Université Libre de Bruxelles, Brussels, Belgium, where he was a recipient of European Commission’s Marie Curie and Belgian F.R.S-FNRS Aspirant fellowships.
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Abstract: Memory has passed compute as the most critical determiner of system performance, as well as the largest component of cost. However, decisions about memory architecture are often left as an afterthought or decided by "rules of thumb" or "zeitgeist" instead of the quantitative/analytical approaches common in computer architecture. In this talk, data-driven approaches for setting direction in memory architectures will be explored through the lens of two different system-level memory problems: Exascale supercomputing and Cloud memory disaggregation.

Bio: Dr. Daniel Ernst is currently a Principal Architect in Microsoft's Azure Hardware Architecture team, which is responsible for long-range technology pathfinding for future Azure Cloud systems. Within AHA, Dan leads the team responsible for future memory systems. This team investigates future architecture directions for Azure and serves as the primary architecture contact point in technical relationships with compute, memory, and device partners, as well as the primary driver of Microsoft’s memory standards activity. Prior to joining Microsoft, Dan spent 10 years at Cray/HPE, most recently as a Distinguished Technologist in the HPC Advanced Technology team. While at Cray, Dan led multiple customer-visible collaborative pathfinding investigations into future HPC architectures and was part of the team that architected the Department of Energy’s Frontier and El Capitan Exascale systems. Dan has served as part of multiple industry standards bodies throughout his career, including JEDEC, the CXL and CCIX consortia, and as a founding Board of Directors member of the Gen-Z Consortium. Dan received his Ph.D. in Computer Science and Engineering from the University of Michigan, where he studied high-performance, low-power, and fault-tolerant microarchitectures. He also holds an MSE from Michigan and a BS in Computer Engineering from Iowa State University.
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Abstract: A growing number of classical HPC applications - modeling and simulation applications - are bottlenecked due to insufficient memory bandwidth. At the same time, AI applications, which are forming an increasingly important part of HPC, and compute in general, are often bottlenecked because of insufficient communication (node to node) bandwidth. In addition, the ability to leverage efficient accelerator cycles for both types of applications is key towards continuing the exponential growth for post-exascale computing. In this talk I will describe the key trends identified above, and discuss the research we are undertaking to design the hardware and software architecture for HPC and AI applications to obtain the next level of exponential increase in performance. I will suggest a path forward based on leveraging tightly integrating memory and compute, called Memory Couple Compute, and describe the interesting design space that needs to be considered to make this architecture a reality. This capability has the potential to be the next discontinuity in HPC and AI.

Bio: Dr. Robert W. Wisniewski is a Senior Vice President, Chief Architect of HPC, and the Head of Samsung's SAIT Systems Architecture Lab. He is an ACM Distinguished Scientist and IEEE Senior Member. The System Architecture Lab is innovating technology to overcome the memory and communication walls for HPC and AI applications. He has published over 80 papers in the area of high performance computing, computer systems, and system performance, has filed over 60 patents with 46 issued, has an h-index of 41 with over 7100 citations, and has given over 78 external invited presentations. Prior to joining Samsung, he was an Intel Fellow and CTO and Chief Architect for High Performance Computing at Intel. He was the technical lead and PI for Aurora, the supercomputer to be delivered to Argonne National Laboratory that will achieve greater than an exaflop of computation. He was also the lead architect for Intel's cohesive and comprehensive software stack that was used to seed OpenHPC, and served on the OpenHPC governance board as chairman. Before Intel, he was the chief software architect for Blue Gene Research and manager of the Blue Gene and Exascale Research Software Team at the IBM T.J. Watson Research Facility, where he was an IBM Master Inventor and led the software effort on Blue Gene/Q, which received the National Medal of Technology and Innovation, was the most powerful computer in the world in June 2012, and occupied 4 of the top 10 positions on the Top 500 list.
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Abstract: Fugaku is the first 'exascale' supercomputer of the world, not due to its peak double precision flops, but rather, its demonstrated performance in real applications that were expected of exascale machines on their conceptions 10 years ago, as well as reaching actual exaflops in new breeds of benchmarks such as HPL-AI. But the importance of Fugaku is its "applications first" philosophy under which it was developed, and its resulting mission to be the centerpiece for rapid realization of the so-called Japanese 'Society 5.0' as defined by the Japanese S&T national policy. As such, Fugaku's immense power is directly applicable not only to traditional scientific simulation applications, but can be a target of Society 5.0 applications that encompasses conversion of HPC & AI & Big Data as well as Cyber (IDC & Network) vs. Physical (IoT) space, with immediate societal impact. In fact, Fugaku is already in partial operation a year ahead of schedule, primarily to obtain early Society 5.0 results including combatting COVID-19 as well as resolving other important societal issues. The talk will introduce how Fugaku had been conceived, analyzed, and built over the 10 year period, look at its current efforts regarding Society 5.0 and COVID, as well as touch upon our thoughts on the next generation machine, or "Fugaku NeXT".

Bio: Satoshi Matsuoka is the director of RIKEN R-CCS, the top-tier HPC center in Japan which operates the K Computer and will host its successor Supercomputer Fugaku, and he is a Specially Appointed Professor at Tokyo Tech since 2018. He had been a Full Professor at the Global Scientific Information and Computing Center (GSIC), Tokyo Institute of Technology, since 2000, where he has been the leader of the TSUBAME series of supercomputers that have won many accolades such as world #1 in power-efficient computing. Satoshi Matsuoka also leads various major supercomputing research projects in areas such as parallel algorithms and programming, resilience, green computing, and convergence of Big Data/AI with HPC. He has written over 500 articles, chaired numerous ACM/IEEE conferences, and has won many awards, such as the ACM Gordon Bell Prize in 2011 and the highly prestigious 2014 IEEE-CS Sidney Fernbach Memorial Award.
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Abstract: As the scale of deep neural networks continues to increase exponentially, distributed training is becoming an essential tool in deep learning. Especially in the context of un/semi/self-supervised pretraining, larger models tend to achieve much higher accuracy. This trend is especially clear in natural language processing, where the latest GPT-3 model has 175 billion parameters. The training of such models requires hybrid data+model-parallelism. In this talk, I will describe two of our recent efforts; 1) second-order optimization and 2) reducing memory footprint, in the context of large-scale distributed deep learning.

Bio: Rio Yokota is an Associate Professor at the Tokyo Institute of Technology. His research interest lie at the intersection of HPC and ML. On the HPC side, he has worked on hierarchical low-rank approximation methods such as FMM and H-matrices. He has worked on GPU computing since 2007 and won the Gordon Bell prize using the first GPU supercomputer in 2009. On the ML side, he works on distributed deep learning and second-order optimization. His work on training ImageNet in 2 minutes with second-order methods has been extended to various applications using second-order information.
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Abstract: Tensor decompositions, contractions, and tensor networks are prevalent in applications ranging from data modeling to simulation of quantum systems. Numerical kernels within these methods present challenges associated with sparsity, symmetry, and other types of tensor structure. We describe recent innovations in algorithms for tensor contractions and tensor decompositions, which minimize costs and improve scalability. Further, we highlight new libraries for (1) automatic differentiation in the context of high-order tensor optimization, (2) efficient tensor decomposition, and (3) tensor network state simulation. These libraries all build on distributed tensor contraction kernels for sparse and dense tensors provided by the Cyclops library, enabling a shared ecosystem for applications of tensor computations.

Bio: Edgar Solomonik is an assistant professor in the Department of Computer Science at the University of Illinois at Urbana-Champaign. He was previously an ETH Zurich Postdoctoral Fellow at ETH Zurich and did his PhD at the University of California, Berkeley. He has received the DOE Computational Science Graduate Fellowship, ACM/IEEE-CS George Michael Memorial HPC Fellowship, the David J. Sakrison Memorial Prize, the Alston S. Householder Prize, the IEEE-CS TCHPC Award for Excellence for Early Career Researchers in High Performance Computing, the SIAM Activity Group on Supercomputing Early Career Prize, and an NSF CAREER award. His research focuses on high performance numerical linear algebra, tensor computations, and parallel algorithms.
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Abstract: Building efficient and scalable performance analysis and optimizing tools, for large-scale systems, is increasingly important both for the developers of parallel applications and the designers of next-generation HPC systems. However, conventional performance tools suffer from significant time/space overhead due to the ever-increasing problem size and system scale. On the other hand, the cost of source code analysis is independent of the problem size and system scale, making it very appealing for large-scale performance analysis. Inspired by this observation, we have designed a series of light-weight performance tools for HPC systems, such as memory access monitoring, performance variance detection, and communication compression. In this talk, I will share our expreience on building these tools through combining static analysis and runtime analysis and also point out the main challenges in this direction.

Bio: Jidong Zhai is a Tenured Associate Professor in the Computer Science Department of Tsinghua University. He is a recipient of Siebel Scholar, CCF outstanding doctoral dissertation Award, IEEE TPDS Award for Editorial Excellence, and NSFC Young Career Award. He was a Visiting Professor of Stanford University (2015-2016) and a Visiting Scholar of MSRA (Microsoft Research Asia) in 2013. His research interests include parallel computing, performance evaluation, compiler optimization, and heterogeneous computing. He has published more than 50 papers in prestigious refereed conferences and top journals including SC, PPOPP, ASPLOS, ICS, ATC, MICRO, NSDI, IEEE TPDS, and IEEE TC. His research received a Best Paper Finalist at SC14. He is the advisor of Tsinghua Student Cluster Team. The team led by him has achieved 9 international champions in student supercomputing challenges at SC, ISC, and ASC. In 2015 and 2018, the team led by him swept all three champions at SC, ISC, and ASC. He was a program co-chair of NPC 2018 and a program co-chair of ICPP PASA 2015 workshop. He served or is now serving TPC member of SC, ICS, PPOPP, IPDPS, ICPP, NAS, LCPC, and Euro-Par. He is the general secretary of ACM SIGHPC China. He is currently on the editorial boards of IEEE Transactions on Parallel and Distributed Systems (TPDS), IEEE Transactions on Cloud Computing (TCC), and Journal of Parallel and Distributed Computing.
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Abstract: Many modern, high-performance systems increase the cumulated node-bandwidth by offering more than a single communication network and/or by having multiple connections to the network, such that a single processor-core cannot by itself saturate the off-node bandwidth. Efficient algorithms and implementations for collective operations as found in, e.g., MPI, must be explicitly designed for exploiting such multi-lane capabilities. We are interested in gauging to which extent this might be the case.
In the talk, I will illustrate how we systematically decompose the MPI collectives into similar operations that can execute concurrently on and exploit multiple network lanes. Our decomposition is applicable to all standard, regular MPI collectives, and our implementations' performance can be readily compared to the native collectives of any given MPI library. Contrary to expectation, our full-lane, performance guideline implementations in many cases show surprising performance improvements with different MPI libraries on different systems, indicating severe problems with native MPI library implementations. In many cases, our full-lane implementations are large factors faster than the corresponding library MPI collectives. The results indicate considerable room for improvement of the MPI collectives in current MPI libraries including a more efficient use of multi-lane capabilities.

Bio: Jesper Larsson Träff is professor for Parallel Computing at TU Wien (Vienna University of Technology) since 2011. From 2010 to 2011 he was guest professor for Scientific Computing at the University of Vienna. From 1998 until 2010 he was working at the NEC Laboratories Europe in Sankt Augustin, Germany on efficient implementations of MPI for NEC vector supercomputers; this work led to a doctorate (Dr. Scient.) from the University of Copenhagen in 2009. From 1995 to 1998 he spent four years as PostDoc/Research Associate in the Algorithms Group of the Max-Planck Institute for Computer Science in Saarbrücken, and the Efficient Algorithms Group at the Technical University of Munich. He received an M.Sc. in computer science in 1989, and, after two interim years at the industrial research center ECRC in Munich, a Ph.D. in 1995, both from the University of Copenhagen.
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Abstract: Graphs are de facto data structures for many data processing applications, and their volume is ever growing. Many graph processing tasks are computation intensive and/or memory intensive. Therefore, we have witnessed a significant amount of effort in accelerating graph processing tasks with heterogeneous architectures like GPUs, FPGAs and even ASICs. In this talk, we will first review the literatures of large graph processing systems on heterogeneous architectures. Next, we present our research efforts, and demonstrate the significant performance impact of hardware-software co-design on designing high performance graph computation systems and applications. Finally, we outline the research agenda on challenges and opportunities in the system and application development of future graph processing.

Bio: Dr. Bingsheng He is currently an Associate Professor and Vice-Dean (Research) at School of Computing, National University of Singapore. Before that, he was a faculty member in Nanyang Technological University, Singapore (2010-2016), and held a research position in the System Research group of Microsoft Research Asia (2008-2010), where his major research was building high performance cloud computing systems for Microsoft. He got the Bachelor degree in Shanghai Jiao Tong University (1999-2003), and the Ph.D. degree in Hong Kong University of Science & Technology (2003-2008). His current research interests include cloud computing, database systems and high performance computing. His papers are published in prestigious international journals (such as ACM TODS and IEEE TKDE/TPDS/TC) and proceedings (such as ACM SIGMOD, VLDB/PVLDB, ACM/IEEE SuperComputing, ACM HPDC, and ACM SoCC). He has been awarded with the IBM Ph.D. fellowship (2007-2008) and with NVIDIA Academic Partnership (2010-2011). Since 2010, he has (co-)chaired a number of international conferences and workshops, including IEEE CloudCom 2014/2015, BigData Congress 2018 and ICDCS 2020. He has served in editor board of international journals, including IEEE Transactions on Cloud Computing (IEEE TCC), IEEE Transactions on Parallel and Distributed Systems (IEEE TPDS), IEEE Transactions on Knowledge and Data Engineering (TKDE), Springer Journal of Distributed and Parallel Databases (DAPD) and ACM Computing Surveys (CSUR). He has got editorial excellence awards for his service in IEEE TCC and IEEE TPDS in 2019.
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Abstract: We improved the quality and reduced the time to produce machine-learned models for use in small molecule antiviral design. Our globally asynchronous multi-level parallel training approach strong scales to all of Sierra with up to 97.7% efficiency. We trained a novel, character-based Wasserstein autoencoder that produces a higher quality model trained on 1.613 billion compounds in 23 minutes while the previous state-of-the-art takes a day on 1 million compounds. Reducing training time from a day to minutes shifts the model creation bottleneck from computer job turnaround time to human innovation time. Our implementation achieves 318 PFLOPS for 17.1% of half-precision peak. We will incorporate this model into our molecular design loop, enabling the generation of more diverse compounds: searching for novel, candidate antiviral drugs improves and reduces the time to synthesize compounds to be tested in the lab.

Bio: Brian Van Essen is the informatics group leader and a computer scientist at the Center for Applied Scientific Computing at Lawrence Livermore National Laboratory (LLNL). He is pursuing research in large-scale deep learning for scientific domains and training deep neural networks using high-performance computing systems. He is the project leader for the Livermore Big Artificial Neural Network open-source deep learning toolkit, and the LLNL lead for the ECP ExaLearn and CANDLE projects. Additionally, he co-leads an effort to map scientific machine learning applications to neural network accelerator co-processors as well as neuromorphic architectures. He joined LLNL in 2010 after earning his Ph.D. and M.S. in computer science and engineering at the University of Washington. He also has an M.S and B.S. in electrical and computer engineering from Carnegie Mellon University.
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Abstract: The Parallel Research Kernels were developed to support empirical studies of programming models in a variety of contexts without the porting effort required by proxy or mini-applications. I will describe the project and why it has been a useful tool in a variety of contexts and present some of our findings related to modern C++ parallelism for CPU and GPU architectures.

Bio: Jeff Hammond is a Principal Engineer at Intel where he works on a wide range of high-performance computing topics, including parallel programming models, system architecture and open-source software. Previously, Jeff worked at the Argonne Leadership Computing Facility where he worked on Blue Gene and built things with MPI. Jeff received his PhD in Physical Chemistry from the University of Chicago for research performed in collaboration with the NWChem team at Pacific Northwest National Laboratory.
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Abstract: This talk will present the recent development of HiParTI, a Hierarchical Parallel Tensor Infrastructure. I will emphasize on the element-wise sparse tensor contractions, commonly shown in quantum chemistry, physics, and others. We introduce three optimization techniques by using multi-dimensional, efficient hashtable representation for the accumulator and larger input tensor, and all-stage parallelization. Evaluating with 15 datasets, we obtain 28 - 576x speedup over the traditional sparse tensor contraction. With our proposed algorithm- and memory heterogeneity-aware data management, extra performance improvement is achieved on the heterogeneous memory with DRAM and Intel Optane DC Persistent Memory Module (PMM) over a state-of-the-art solutions.

Bio: Jiajia Li is a research scientist in High Performance Computing group at Pacific Northwest National Laboratory (PNNL). She has received her Ph.D. degree from Georgia Institute of Technology in 2018. Her current research emphasizes on optimizing tensor methods especially for sparse data from diverse applications by utilizing various parallel architectures. She is an awardee of Best Student Paper Award at SC'18, Best Paper Finalist at PPoPP'19, and "A Rising Star in Computational and Data Sciences". She has served on the technical program committee of conferences/journals, such as PPoPP, SC, ICS, IPDPS, ICPP, LCTES, Cluster, ICDCS, TPDS, etc. In the past, she had received a Ph.D. degree from Institute of Computing Technology at Chinese Academy of Sciences, China and a B.S. degree in Computational Mathematics from Dalian University of Technology, China.
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Abstract: This talk will describe the co-design and implementation of Legion and Legate, two programming systems that synergistically combine to provide to high productivity high performance computing ecosystem. In the first part of the talk, we'll introduce Legion, a task-based runtime system for supercomputers with a strong data model that enables a sophisticated dependence analysis. The second part of the talk will cover Legate, a framework for constructing drop-in replacements for popular Python libraries such as NumPy and Pandas on top of Legion. We'll show how using Legate and Legion together allows users to run unmodified Python programs at scale on hundreds of GPUs simply by changing a few import statements. We'll also discuss how the Legate framework makes it possible to compose such libraries even in distributed settings.

Abstract: The sparse matrix-vector multiplication (SpMV) kernel is a key performance component of numerous algorithms in computational science. Despite the kernel's apparent simplicity, the sparse and potentially irregular data access patterns of SpMV and its intrinsically low computational intensity haven been challenging the development of high-performance implementations over decades. Still these developments are rarely guided by appropriate performance models.

This talk will address the basic problem of understanding (i.e., modelling) and improving the computational intensity of SpMV kernels with a focus on symmetric matrices. Using a recursive algebraic coloring (RACE) of the underlying undirected graph, a node-level parallel symmetric SpMV implementation is developed which increases the computational intensity and the performance for a large general set of matrices by a factor of up to 2x. The same idea is then applied to accelerate the computation sparse matrix powers via cache blocking.

Bio: Gerhard Wellein is a Professor for High Performance Computing at the Department for Computer Science at the University of Erlangen-Nuremberg and holds a PhD in theoretical physics from the University of Bayreuth. Since 2001 he heads the Erlangen National Center for High Performance Computing, he is the deputy speaker of the Bavarian HPC network KONWIHR and he is member of the scientific steering committee of the Gauss-Centre for Supercomputing (GCS).

Gerhard Wellein has more than twenty years of experience in teaching HPC techniques to students and scientists from computational science and engineering, is an external trainer in the Partnership for Advanced Computing in Europe (PRACE) and received the "2011 Informatics Europe Curriculum Best Practices Award" (together with Jan Treibig and Georg Hager) for outstanding teaching contributions. His research interests focus on performance modelling and performance engineering, architecture-specific code optimization, novel parallelization approaches and hardware-efficient building blocks for sparse linear algebra and stencil solvers. He has been conducting and leading numerous HPC projects including the German Japanese project "Equipping Sparse Solvers for Exascale" (ESSEX) within the DFG priority program SPPEXA ("Software for Exascale Computing").
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Abstract: Microsoft's Project Catapult began nearly a decade ago, leading to the widespread deployment of FPGAs in Microsoft's data centers for application and network acceleration. Project Brainwave began five years later, applying those FPGAs to accelerate DNN inference for Bing and later other Microsoft cloud services. FPGA flexibility has enabled the Brainwave architecture to evolve rapidly, keeping pace with rapid developments in the DNN model space. The low cost of updating FPGA-based designs also enables greater risk taking, facilitating innovations such as our Microsoft Floating Point (MSFP) data format. FPGAs with hardened support for MSFP will provide a new level of performance for Brainwave. These AI-optimized FPGAs also introduce a new point in the hardware spectrum between general-purpose devices and domain-specific accelerators. Going forward, a key challenge for accelerator architects will be finding the right balance between hardware specialization, hardware configurability, and software programmability.

Bio: Steven K. Reinhardt is a Partner Hardware Engineering Manager in the Bing Platform Engineering group. His team leads the development and production deployment of the Brainwave FPGA-based DNN inference accelerator in support of Bing and Office 365. Prior to joining Microsoft, Steve was a Senior Fellow at AMD Research, where he led research on heterogeneous systems and high-performance networking. Before that, he was an Associate Professor in the EECS department at the University of Michigan. Steve has published over 50 refereed conference and journal articles. He was also a primary architect and developer of M5 (now gem5), a widely used open-source full-system architecture simulator. Steve received a Ph.D. in Computer Sciences from the University of Wisconsin-Madison, and is an IEEE Fellow and an ACM Distinguished Scientist.
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Abstract: Sparse matrix methods are at the heart of many scientific computations and data analytics codes. Sparse matrix kernels often dominate the overall execution time of many simulations. Further, the indirection from indexing and looping over the nonzero elements of a sparse data structure often limits the optimization of such codes. In this talk, I will introduce Sympiler, a domain-specific code generator that transforms computation patterns in sparse matrix methods for high-performance. Specifically, I will show how decoupling symbolic analysis from numerical manipulation will enable the automatic optimization of sparse codes. I will also demonstrate the application of symbolic analysis in accelerating quadratic program solvers.

Bio: Maryam Mehri Dehnavi is an Assistant Professor in the Computer Science department at the University of Toronto and is the Canada Research Chair in parallel and distributed computing. Her research focuses on high-performance computing and domain-specific compiler design. Previously, she was an Assistant Professor at Rutgers University and a postdoctoral researcher at MIT. She received her Ph.D. from McGill University in 2013. Some of her recognitions include the Canada Research Chair award, the Ontario Early Researcher award, and the ACM SRC grand finale prize.
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Abstract: Partial differential equations (PDEs) are ubiquitous in science and engineering to model physical phenomena. Notable PDEs are the Laplace and Navier-Stokes equations with numerous applications in fluid dynamics, electrostatics, and steady-state heat transfer. Solving such PDEs relies on numerical methods such as finite element, finite difference, and finite volume. While these methods are extremely powerful, they are also computationally expensive. Despite widespread efforts to improve the performance and scalability of solving these systems of PDEs, several problems remain intractable.
In this talk, we'll explore the potential of deep learning (DL)-based surrogates to both augment and replace numerical simulations. In the first part of the talk, we'll present two frameworks -- CFDNet and SURFNet, that couple simulations with a convolutional neural network to accelerate the convergence of the overall scheme without relaxing the convergence constraints of the physics solver. The second part of the talk will introduce another novel framework that leverages DL to build a transferable deep neural network surrogate that solves PDEs in unseen domains with arbitrary boundary conditions. We'll show that a DL model trained only once can be used forever without re-training to solve PDEs in large and complex domains with unseen sizes, shapes, and boundary conditions. Compared with the state-of-the-art physics-informed neural networks for solving PDEs, we demonstrate 1-3 orders of magnitude speedups while achieving comparable or better accuracy.

Bio: Aparna Chandramowlishwaran is an Associate Professor at the University of California, Irvine, in the Department of Electrical Engineering and Computer Science. She received her Ph.D. in Computational Science and Engineering from Georgia Tech in 2013 and was a research scientist at MIT prior to joining UCI as an Assistant Professor in 2015. Her research lab, HPC Forge, aims at advancing computational science using high-performance computing and machine learning. She currently serves as the associate editor of the ACM Transactions on Parallel Computing.
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Abstract: PIConGPU, an extremely scalable, heterogeneous, fully relativistic particle-in-cell (PIC) C++ code provides a modern simulation framework for laser-plasma physics and laser-matter interactions suitable for production-quality runs on large scale systems. This plasma physics application is fueled by alpaka abstraction library and incorporates openPMD-API enabling I/O libraries such as ADIOS2. Among many supercomputing systems, PIConGPU has been running on ORNL's Titan, Summit and is expected to run on the Exascale system, Frontier, that is being built as we speak. This talk will discuss some of the challenges, opportunities and potential solutions with respect to maintaining a performant portable code while migrating the same to Frontier.

Bio: Sunita Chandrasekaran is an Assistant Professor with the Dept. of Computer and Information Sciences at the University of Delaware, USA. Her research interests span High Performance Computing, interdisciplinary science, machine learning and data science. Chandrasekaran has organized and served in the TPC of several conferences and workshops including SC, ISC, IPDPS, IEEE Cluster, CCGrid and WACCPD. She is currently an associated and subject area editor for IEEE TPDS, Elsevier's PARCO, FGCS and JPDC. She is a recipient of the 2016 IEEE-CS TCHPC Award for Excellence for Early Career Researchers in HPC. She received her Ph.D. in 2012 on Tools and Algorithms for High-Level Algorithm Mapping to FPGAs from the School of Computer Science and Engineering, Nanyang Technological University, Singapore.
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Abstract: Supercomputer performance now exceeds that of the earliest computers by thirteen orders of magnitude, yet science still needs more than they provide. But with Dennard scaling and Moore's Law ending even as AI and HPC demand continued growth. Demand engenders supply, and ways to prolong the growth in supercomputing performance are at hand or on the horizon. Architectural specialization has returned, after a loss of system diversity in the Moore's law era; it provides a significant boost for computational science. And at the hardware level, the development by Cerebras of a viable wafer-scale compute platform has important ramifications. Other long-term possibilities, notably quantum computing, may eventually play a role.
Why wafer-scale? Real achieved performance in supercomputers (as opposed to the peak speed) is limited by the bandwidth and latency barriers --- memory and communication walls --- that impose delay when off-processor-chip data is needed, and it is needed all the time. By changing the scale of the chip by two orders of magnitude, we can pack a small, powerful, mini-supercomputer on one piece of silicon, and eliminate much of the off-chip traffic for applications that can fit in the available memory. The elimination of most off-chip communication also cuts the power per unit performance, a key parameter when total system power is capped, as it usually is.
Cerebras overcame technical problems concerning yield, packaging, cooling, and delivery of electrical power in order to make wafer-scale computing viable. The Cerebras second generation wafer has over 800,000 identical processing elements architected with features that support sparsity and power-efficient performance. For ML, algorithmic innovations such as conditional computations and model and data sparsity promise significant savings in memory and computation while preserving model capacity. Flexible hardware rather than dense matrix multiply is required to best exploit these algorithmic innovations. We will discuss the aspects of the architecture that meet that requirement.

Bio: Rob Schreiber is a Distinguished Engineer at Cerebras Systems, Inc., where he works on architecture and programming of highly parallel systems for AI and science. Before Cerebras he taught at Stanford and RPI and worked at NASA, at startups, and at HP. Schreiber's research spans sequential and parallel algorithms for matrix computation, compiler optimization for parallel languages, and high performance computer design. With Moler and Gilbert, he developed the sparse matrix extension of Matlab. He created the NAS CG parallel benchmark. He was a designer of the High Performance Fortran language. Rob led the development at HP of a system for synthesis of custom hardware accelerators. He has help pioneer the exploitation of photonic signaling in processors and networks. He is an ACM Fellow, a SIAM Fellow, and was awarded, in 2012, the Career Prize from the SIAM Activity Group in Supercomputing.

Bio: Natalia Vasilieva is Director of Product, Machine Learning at Cerebras Systems, where she leads market, application, and algorithm analysis for ML use cases. She was a Senior Research Manager at HP Labs, where she led the Software and AI group, worked on performance characterization and modelling of deep learning workloads, fast Monte Carlo simulations, and systems software, programming paradigms, algorithms and applications for The HP memory-driven computing project. She was an associate professor at Saint Petersburg State University and a lecturer at the Saint Petersburg Computer Science Center, and holds a PhD in mathematics, computer science, and information technology from Saint Petersburg State University.
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Abstract: Current system architectures rely on a simple approach: one compute node design that is used across the entire system. This approach only supports heterogeneity at the node level. Compute nodes may involve a variety of devices but the system is otherwise homogeneous. This design simplifies scheduling applications and provides consistent expectations for the hardware that a job can exploit but often results in poor utilization of components. The wide range of emerging devices for AI and other domains necessitates a more heterogeneous system architecture that varies the compute node (or volume) types within a single job.
Lawrence Livermore National Laboratory (LLNL) is currently exploring such heterogeneous system architectures. These explorations include the use of novel hardware to accelerate AI models within larger applications and initial software solutions to overcome the challenges posed by heterogeneous system architectures. This talk will present a sampling of the novel software solutions that enable the heterogeneous system architecture as well as the systems that LLNL has currently deployed.

Bio: As Chief Technology Officer (CTO) for Livermore Computing (LC) at Lawrence Livermore National Laboratory (LLNL), Bronis R. de Supinski formulates LLNL's large-scale computing strategy and oversees its implementation. He frequently interacts with supercomputing leaders and oversees many collaborations with industry and academia. Previously, Bronis led several research projects in LLNL's Center for Applied Scientific Computing. He earned his Ph.D. in Computer Science from the University of Virginia in 1998 and he joined LLNL in July 1998. In addition to his work with LLNL, Bronis is also a Professor of Exascale Computing at Queen's University of Belfast and an Adjunct Associate Professor in the Department of Computer Science and Engineering at Texas A&M University. Throughout his career, Bronis has won several awards, including the prestigious Gordon Bell Prize in 2005 and 2006, as well as two R&D 100s, including one for his leadership in the development of a novel scalable debugging tool.
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Abstract: Today's AI is too big. Deep neural networks demand extraordinary levels of data and computation, and therefore power, for training and inference. This severely limits the practical deployment of AI in edge devices. We aim to improve the efficiency of neural network design. First, I'll present MCUNet that brings deep learning to IoT devices. MCUNet is a framework that jointly designs the efficient neural architecture (TinyNAS) and the light-weight inference engine (TinyEngine), enabling ImageNet-scale inference on micro-controllers that have only 1MB of Flash. Next I will introduce Once-for-All Network, an efficient neural architecture search approach, that can elastically grow and shrink the model capacity according to the target hardware resource and latency constraints. From inference to training, I'll present TinyTL that enables tiny transfer learning on-device, reducing the memory footprint by 7-13x. Finally, I will describe data-efficient GAN training techniques that can generate photo-realistic images using only 100 images, which used to require tens of thousands of images. We hope such TinyML techniques can make AI greener, faster, more efficient and more sustainable.

Bio: Song Han is an assistant professor at MIT's EECS. He received his PhD degree from Stanford University. His research focuses on efficient deep learning computing. He proposed "deep compression" technique that can reduce neural network size by an order of magnitude without losing accuracy, and the hardware implementation "efficient inference engine" that first exploited pruning and weight sparsity in deep learning accelerators. His team's work on hardware-aware neural architecture search that bring deep learning to IoT devices was highlighted by MIT News, Wired, Qualcomm News, VentureBeat, IEEE Spectrum, integrated in PyTorch and AutoGluon, and received many low-power computer vision contest awards in flagship AI conferences (CVPR'19, ICCV'19 and NeurIPS'19). Song received Best Paper awards at ICLR'16 and FPGA'17, Amazon Machine Learning Research Award, SONY Faculty Award, Facebook Faculty Award, NVIDIA Academic Partnership Award. Song was named "35 Innovators Under 35" by MIT Technology Review for his contribution on "deep compression" technique that "lets powerful artificial intelligence (AI) programs run more efficiently on low-power mobile devices." Song received the NSF CAREER Award for "efficient algorithms and hardware for accelerated machine learning" and the IEEE "AIs 10 to Watch: The Future of AI" award.
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Abstract: Convolutional Neural Networks (CNNs) are central to Deep Learning. The optimization of CNNs has therefore received significant attention. Minimizing data movement is critical to performance optimization. This talk will address the minimization of data movement for CNNs in two scenarios. In the first part of the talk, the optimization of tile loop permutations and tile size selection will be discussed for executing CNNs on multicore CPUs. Most efforts on optimization of tiling for CNNs have either used heuristics or limited search over the huge design space. We show that a comprehensive design space exploration is feasible via analytical modeling. In the second part of the talk, communication minimization for executing CNNs on distributed systems will be discussed.

Bio: Sadayappan is a Professor in the School of Computing at the University of Utah, with a joint appointment at Pacific Northwest National Laboratory. His primary research interests center around performance optimization and compiler/runtime systems for high-performance computing, with a special emphasis on optimization of tensor computations. Sadayappan is an IEEE Fellow.
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Abstract: The Xilinx Versal devices include an array of AIEngine Vector-VLIW processor cores suitable for Machine Learning and DSP processing tasks. This talk will provide an overview of AIEngine-based devices and discuss how they are programmed. The talk will also present recent work to build open source tools for these devices based on MLIR to support a wide variety of high-level programming models.

Bio: Stephen Neuendorffer is a Distinguished Engineer in the Xilinx Research Labs working on various aspects of system design for FPGAs. Previously, he was product architect of Xilinx Vivado HLS and co-authored a widely used textbook on HLS design for FPGAs. He received B.S. degrees in Electrical Engineering and Computer Science from the University of Maryland, College Park in 1998. He graduated with University Honors, Departmental Honors in Electrical Engineering, and was named the Outstanding Graduate in the Department of Computer Science. He received the Ph.D. degree from the University of California, Berkeley, in 2003, after being one of the key architects of Ptolemy II.
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Abstract: Physics-Informed Neural Networks (PINNs) have recently emerged as a powerful tool for solving scientific computing problems. PINNs can be effectively used for developing surrogate models, completing data assimilation and uncertainty quantification tasks, and solving ill-defined problems, e.g., problems without boundary conditions or a closure equation. An additional application of PINNs is a central topic for scientific computing: the development of numerical solvers of Partial Differential Equations (PDE). While the accuracy and performance of PINNs for solving PDEs directly are still relatively low compared to traditional numerical solvers, combining traditional methods and PINNs opens up the possibility of designing new hybrid numerical methods. This talk introduces how PINNs work, emphasizing the relation between PINN components and main ideas with classical numerical methods, such as Finite Element Methods, Krylov solvers, and quasi-MonteCarlo techniques. I present PINNs' features that make them amenable to use in combination with traditional solvers. I then outline opportunities for developing a new class of numerical methods combining classical and neural network solvers, providing results from initial experiments.

Bio: I was born in Parma, Italy, in 1976. I studied in Torino, Italy, and Urbana-Champaign, Illinois, obtaining an MS and Ph.D. degree in Nuclear Engineering. Since 2012, I work at KTH Royal Institute of Technology, Sweden. I am now an associate professor. My research interest focuses on programming models and emerging computing paradigms. Homepage

Abstract: In addition to the traditional theory and experimental pillars of science, we are witnessing the emergence of three additional pillars, which are simulation, data analysis, and machine learning. All three recent pillars of science rely on computing but in different ways. Matrices, and sparse matrices in particular, play an outsized role in all three computing related pillars of science, which will be the topic of my talk.
I will first highlight some of the emerging use cases of sparse matrices in data analysis and machine learning. These include graph computations, graph representation learning, and computational biology. The rest of my talk will focus on new parallel algorithms for such modern computations on sparse matrices. These include the use of "masking" for filtering out undesired output entries in sparse-times-sparse and dense-times-dense matrix multiplication, new distributed-memory algorithms for sparse matrix times tall-skinny dense matrix multiplication, combinations of these algorithms, and subroutines of them.

Bio: Aydın Buluç is a Staff Scientist and Principal Investigator at the Lawrence Berkeley National Laboratory (LBNL) and an Adjunct Assistant Professor of EECS at UC Berkeley. His research interests include parallel computing, combinatorial scientific computing, high performance graph analysis and machine learning, sparse matrix computations, and computational biology. Previously, he was a Luis W. Alvarez postdoctoral fellow at LBNL and a visiting scientist at the Simons Institute for the Theory of Computing. He received his PhD in Computer Science from the University of California, Santa Barbara in 2010 and his BS in Computer Science and Engineering from Sabanci University, Turkey in 2005. Dr. Buluç is a recipient of the DOE Early Career Award in 2013 and the IEEE TCSC Award for Excellence for Early Career Researchers in 2015. He was a founding associate editor of the ACM Transactions on Parallel Computing.
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Abstract: NVIDIA is committed to helping address climate change. Recently our CEO announced the Earth-2 initiative, which aims to build digital twins of the Earth and a dedicated supercomputer, E-2, to power them. Two central goals of this initiative are to predict the disastrous impacts of climate change well in advance and to help develop strategies to mitigate and adapt to change.
Here we present our work on an AI weather forecast surrogate trained on ECMWF's ERA5 reanalysis dataset. The model, called FourCastNet, employs a patch-based Vision-Transformer with a Fourier Neural Operator mixer. FourCastNet produces short to medium range weather predictions of about two dozen physical fields at 25-km resolution that exceed the quality of all related deep learning-based techniques to date. FourCastNet is capable of accurately forecasting fast timescale variables such as the surface wind speed, precipitation, and atmospheric water vapor with important implications for wind energy resource planning, predicting extreme weather events such as tropical cyclones and atmospheric rivers, as well as extreme precipitation. We compare the forecast skill of FourCastNet with archived operational IFS model forecasts and find that the forecast skill of our purely data-driven model is remarkably close to that of the IFS model for forecast lead times of up to 8 days. Furthermore, it can produce a 10-day forecast in a fraction of a second on a single GPU.
The enormous speed and high accuracy of FourCastNet provides at least three major advantages over traditional forecasts: (i) real-time user interactivity and analysis; (ii) the potential for large forecast ensembles; and (iii) the ability to combine fast surrogates to form new coupled systems. Large ensembles can capture rare but highly impactful extreme weather events and better quantify the uncertainty of such events by providing more accurate statistics. The figure below shows results from FourCastNet in NVIDIA's interactive Omniverse environment. On the left we show atmospheric rivers making landfall in California in Feb, 2017. On the right is a forecast of hurricane Matthew from Sept 2016. By plugging AI surrogates into Omniverse, users can generate, visualize, and explore potential weather outcomes interactively.

Bio: Karthik Kashinath is a senior machine learning scientist and technologist at NVIDIA. He leads various ML initiatives for Earth System Science and CFD applications, including for NVIDIA's Earth-2 initiative aiming to build digital twins of the Earth. Before joining NVIDIA in August 2021, he was at NERSC, Lawrence Berkeley Lab, where he led various climate informatics and machine learning projects at the Big Data Center. He received his Bachelors from the Indian Institute of Technology - Madras, Masters from Stanford University, and PhD from the University of Cambridge. His background is in engineering and applied physics. His research uses the power of machine learning to accelerate scientific discovery in the complex chaotic systems of turbulence, weather, and climate science. A particular focus area is physics-informed machine learning to develop physically consistent, trustworthy, and robust machine learning models. When he is not in front of the computer he is hiking up mountains, swimming in lakes, or cooking up a storm.

Abstract: Programming heterogeneous computing systems is still a daunting task that will become even more challenging with the advent of emerging, non Von-Neumann computer architectures. The so-called golden age of computer architecture thus must be accompanied by a, hopefully, golden age of research in compilers and programming languages. This talk discusses research along two fronts, namely, (1) on domain specific languages (DSLs) to hide complexity from non-expert programmers while passing richer information to compilers, and (2) on understanding the fundamental changes in emerging computing paradigms and their consequences for compilers. Concretely, we will talk about DSLs for physics simulations, compute-in-memory with emerging technologies, and current efforts in unifying intermediate representations with the MLIR compiler framework.

Bio: Jeronimo Castrillon is a professor in the Department of Computer Science at the TU Dresden, where he is also affiliated with the Center for Advancing Electronics Dresden (CfAED). He is the head of the Chair for Compiler Construction, with research focus on methodologies, languages, tools and algorithms for programming complex computing systems. He received the Electronics Engineering degree from the Pontificia Bolivariana University in Colombia in 2004, his masters degree from the ALaRI Institute in Switzerland in 2006 and his Ph.D. degree (Dr.-Ing.) with honors from the RWTH Aachen University in Germany in 2013. In 2014, Prof. Castrillon co-founded Silexica GmbH/Inc, a company that provides programming tools for embedded multicore architectures, now with Xilinx/AMD.
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Abstract: Machine learning, and training deep learning in specific, are becoming one of the main workloads running on HPC systems. More so, the scientific computing community is increasingly adopting modern deep learning approaches to their workflows. When HPC practitioners attempt to scale a typical HPC workload, they are mostly challenged by a particular bottleneck. Scaling deep learning, on the other hand, can be challenged by different bottlenecks: memory capacity, communication, I/O, compute etc. In this talk we give an overview of the bottlenecks in scaling deep learning, and highlight efforts in addressing some of those bottlenecks: memory capacity and I/O.

Bio: Mohamed Wahib is a team leader of the "High Performance Artificial Intelligence Systems Research Team" at RIKEN Center for Computational Science (R-CCS), Kobe, Japan. Prior to that he worked as is a senior scientist at AIST/TokyoTech Open Innovation Laboratory, Tokyo, Japan. He received his Ph.D. in Computer Science in 2012 from Hokkaido University, Japan. His research interests revolve around the central topic of high-performance programming systems, in the context of HPC and AI. He is actively working on several projects including high-level frameworks for programming traditional scientific applications, as well as high-performance AI.
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Abstract: Code generation and optimization for the diversity of current and future architectures must focus on reducing data movement to achieve high performance. How data is laid out in memory, and representations that compress data (e.g., reduced floating point precision) have a profound impact on data movement. Moreover, the cost of data movement in a program is architecture-specific, and consequently, optimizing data layout and data representation must be performed by a compiler once the target architecture is known. With this context in mind, this talk will provide examples of data layout and data representation optimizations, and call for integrating these data properties into code generation and optimization systems.

Bio: Mary Hall is a Professor and Director of the School of Computing at University of Utah. She received a PhD in Computer Science from Rice University. Her research focus brings together compiler optimizations targeting current and future high-performance architectures on real-world applications. Hall's prior work has developed compiler techniques for exploiting parallelism and locality on a diversity of architectures: automatic parallelization for SMPs, superword-level parallelism for multimedia extensions, processing-in-memory architectures, FPGAs and more recently many-core CPUs and GPUs. Professor Hall is an IEEE Fellow, an ACM Distinguished Scientist and a member of the Computing Research Association Board of Directors. She actively participates in mentoring and outreach programs to encourage the participation of women and other groups underrepresented in computer science.
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Abstract: Multiple simultaneous disruptions are currently under way in both hardware and software, as we consider the implications for future HPC systems. In hardware, "extreme heterogeneity" has become critical to sustaining cost and performance improvements after Moore's Law, but poses significant productivity challenges for developers. In software, the rise of large-scale AI and data analytics applications is being driven by domain experts from diverse backgrounds who demand the programmability that they have come to expect from high-level languages like Python. While current foundations for programming models, compilers, runtime systems, and debuggers have served us well for many decades, we now see signs of their limitations in the face of these disruptions. This talk makes a case for new approaches to enable productivity and programmability of future HPC systems for domain experts, and discusses recent approaches being explored in the Habanero Extreme Scale Software Research Laboratory. Preliminary results will be shared for the new compiler and runtime techniques being explored in our laboratory, including how we propose to respond to the challenge of automating distributed heterogeneous computing for Python-level domain experts.

Bio: Vivek Sarkar is Chair of the School of Computer Science and the Stephen Fleming Chair for Telecommunications in the College of Computing at Georgia Institute of Technology. He conducts research in multiple aspects of programmability and productivity in parallel computing, including programming languages, compilers, runtime systems, and debuggers for parallel, heterogeneous, and high-performance computer systems.
Sarkar started his career in IBM Research after obtaining his Ph.D. from Stanford University, supervised by John Hennessy. His research projects at IBM include the PTRAN automatic parallelization system led by Fran Allen, the ASTI optimizer for IBM's XL Fortran product compilers, the open-source Jikes Research Virtual Machine for the Java language, and the X10 programming language developed in the DARPA HPCS program. He was a member of the IBM Academy of Technology during 1995-2007, and Senior Manager of the Programming Technologies Department at IBM Research during 2000-2007. After moving to academia, Sarkar has mentored over 30 Ph.D. students and postdoctoral researchers in the Habanero Extreme Scale Software Research Laboratory, first at Rice University since 2007, and now at Georgia Tech since 2017. Researchers in his lab have developed the Habanero-C/C++ and Habanero-Java programming systems for parallel, heterogeneous, and distributed platforms. While at Rice, Sarkar was the E.D. Butcher Chair in Engineering, served as Chair of the Department of Computer Science, created a new sophomore-level course on the fundamentals of parallel programming, as well as a three-course Coursera specialization on parallel, concurrent, and distributed programming.
Sarkar is an ACM Fellow and an IEEE Fellow. He has been serving as a member of the US Department of Energy's Advanced Scientific Computing Advisory Committee (ASCAC) since 2009, and is currently co-chair of the recently created CRA-Industry committee (after serving on the CRA Board for seven years). Sarkar is also the recipient of the 2020 ACM-IEEE CS Ken Kennedy Award.
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Abstract: The bandwidth and latency requirements of modern datacenter applications have led researchers to propose various datacenter topology designs using static, dynamic demand-oblivious (rotor), and/or dynamic demand-aware switches. However, given the diverse nature of datacenter traffic, there is little consensus about how these designs would fare against each other. In this talk, I will present the vision of self-adjusting networks: networks which are optimized towards, and "match", the traffic workload they serve. We will discuss information-theoretic metrics to quantify the structure in communication traffic as well as the achievable performance in datacenter networks matching their demands, present network design principles accordingly, and identify open research challenges. I will also show how the notions of self-adjusting networks and demand-aware graphs relate to classic optimization problems in theoretical computer science.

Bio: Stefan Schmid is a Full Professor at the Technical University of Berlin, Germany, working part-time for the Fraunhofer Institute for Secure Information Technology (SIT). He is also a Principle Investigator of the Weizenbaum Institute for the Networked Society in Berlin. He obtained his diploma (MSc) in Computer Science at ETH Zurich in Switzerland (minor: micro/macro economics, internship: CERN) and did his PhD in the Distributed Computing Group led by Prof. Roger Wattenhofer, also at ETH Zurich. As a postdoc, he worked with Prof. Christian Scheideler at the Chair for Efficient Algorithms at the Technical University of Munich and at the Chair for Theory of Distributed Systems at the University of Paderborn, in Germany. From 2009 to 2015, Stefan Schmid was a senior research scientist at the Telekom Innovation Laboratories (T-Labs) and at TU Berlin in Germany (Internet Network Architectures group headed by Prof. Anja Feldmann). In 2013/14, he was an INP Visiting Professor at CNRS (LAAS), Toulouse, France, and in 2014, a Visiting Professor at Université catholique de Louvain (UCL), Louvain-la-Neuve, Belgium. From 2015 to 2018, Stefan Schmid was a (tenured) Associate Professor in the Distributed, Embedded and Intelligent Systems group at Aalborg University, Denmark, and from 2018 to 2021, a Full Professor at the Faculty of Computer Science at the University of Vienna, Austria. In 2022, Stefan Schmid was a Fellow at the Israel Institute for Advanced Studies (IIAS) in Jerusalem, Israel.
Since 2021, he is a Council and Board member of the European Association of Theoretical Computer Science (EATCS) and also serves as the Editor-in-Chief of the Bulletin of the EATCS. Since 2019 Stefan Schmid is an Editor of IEEE/ACM Transactions on Networking (ToN). From 2015 to 2021, he was the Editor of the Distributed Computing Column of the Bulletin of the EATCS, and from 2016 to 2019, an Associate Editor of IEEE Transactions on Network and Service Management (TNSM). Stefan Schmid received the IEEE Communications Society ITC Early Career Award 2016 and acquired several major grants including an ERC Consolidator Grant, various other EU grants (e.g., STREP and IP projects) and national grants (e.g., three FWF projects), a German-Israeli GIF grant, a Villum Fonden grant, a WWTF grant, and various German grants (e.g., from BSI and BMBF). In 2015, he co-founded the startup company Stacktile supported by Germany's EXIST program, and in 2020, he helped establish the Vienna Cybersecurity and Privacy Research Center (ViSP) for which he also served in the executive board. Stefan Schmid's research interests revolve around the fundamental and algorithmic problems of networked and distributed systems.
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Abstract: The ever-growing demand for more accurate machine learning models has resulted in a steady increase in dataset and model sizes of deep neural networks (DNNs). Although hardware accelerators have provided a significant amount of speed-up, today's DNN models can still take days and even weeks to train mainly because conventional datacenter networks are becoming a bottleneck for distributed DNN training workloads. In this talk, I will discuss two techniques to accelerate DNN training workloads. First, I will present a novel optical fabric that co-optimizes the network topology and parallelization strategy for DNN clusters. Second, I will argue that fair-sharing, the holy grail of congestion control algorithms for decades, is not necessarily a desirable property in DNN training clusters and propose a scheduling technique that carefully places jobs on network links to avoid bandwidth sharing.

Bio: Manya Ghobadi is an associate professor in the EECS department at MIT. Her research spans different areas in computer networks, focusing on optical reconfigurable networks, networks for machine learning, and high-performance cloud infrastructure. Her work has been recognized by the Sloan Fellowship in Computer Science, NSF CAREER award, Optica Simmons Memorial Speakership award, best paper award at the Machine Learning Systems (MLSys) conference, as well as the best dataset, and best paper awards at the ACM Internet Measurement Conference (IMC). Manya received her Ph.D. from the University of Toronto and spent a few years at Microsoft Research and Google prior to joining MIT.
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Abstract: The high performance computing is evolving rapidly, shaped by the confluence of three trends: a) traditional simulation and modeling workloads are converging with massive data analytic and AI/ML workflows; b) the efficiency of special purpose heterogeneous hardware is increasing; and c) the demand for flexible delivery models that blend traditional on-premises deployments with cloud-like as-a-service models continues to grow. Heterogeneity is driven by the end of Moore's Law, growth of data, and by the emergence of broad AI adoption that is well-suited for special-purpose hardware. To date, serverless computing abstracts the complexity of the underlying infrastructure by leveraging homogeneity and is motivated by simplified DevOps experience for new composable and scalable applications. Delivering the efficiency of heterogeneity, the productivity of serverless, and the granularity of Functions-as-a-Service demands a new architecture.
The Heterogeneous Serverless Computing (HSC) aims to enable development and delivery of HPC, HPDA, and AI (H2A) workloads with the ease and efficiency of the Cloud and with higher scale and more fluidity than supercomputers. HSC is a software-hardware co-designed infrastructure supporting H2A workflow execution economically and securely at fine granularity using Functions as a Service (FaaS). HSC targets the changeover evolution to H2A workflows with flexible consumption models, the edge-to-exascale deployment, and embraces a more maintainable, scalable, and re-usable development model. We focus on innovative uses of accelerators, such as in SmartNICs and Fabric Attached Memories, to improve performance of H2A applications and efficiency of hardware, but without compromising ease of development.

Bio: Dejan Milojicic is a distinguished technologist at Hewlett Packard Labs, Milpitas, CA. He leads research on Future Architectures and is the Principal Investigator of the Heterogeneous Serverless Computing that spans all Hewlett Packard Labs. Earlier he has led the software of the Dot Product Engine, an in-memory AI accelerator. In his lengthy HP(E) career, he contributed to numerous research efforts spanning software, distributed computing, systems management, and HPC. Dejan led large industry-government-academia collaborations, such as Open Cirrus for the HPC in Cloud program and New Operating System for The Machine program. Dejan has written over 200 papers, 2 books and 79 patents. Dejan is an IEEE Fellow, ACM Distinguished Engineer, and HKN and USENIX member. Dejan was on 8 PhD thesis committees, and he mentored over 50 interns. He founded and taught Cloud Management class at San Jose State University.
Dejan was president of the IEEE Computer Society, IEEE presidential candidate, editor-in-chief of IEEE Computing Now and IEEE Distributed Systems Online and he has served and continues to serve on many editorial boards, technical program committees and steering committees. Previously, Dejan worked in the OSF Research Institute, Cambridge, MA and Institute "Mihajlo Pupin", Belgrade, Serbia. He contributed to novel systems software and parallel and distributed systems that were deployed throughout Europe. Dejan received his Ph.D. from the University of Kaiserslautern, Germany; and his MSc/BSc from Belgrade University, Serbia.
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Abstract: AI Engine (AIE) is an array of vector processors developed by AMD/Xilinx. AIE is part of both the Xilinx Versal 7nm family of devices and next-gen AMD APU devices. This architecture is composed of a 2D array of tiles, where each compute tile includes a VLIW SIMD vector processor, scratchpad memory, data movement engines and streaming interconnect. Target applications include machine learning inference in datacentre, automotive and edge, as well as wireless (5G) acceleration. In this talk, David will present an overview of the architecture and then go into details on data movement, synchronization, reconfiguration, and application mapping onto hardware.

Bio: David is a computer architect with AMD, working on defining the AI Engine (AIE) architecture. He has an undergraduate degree in Computational Physics from TCD and a PhD in High-Performance Heterogeneous Computing (UCD). In 2014 he joined the Xilinx Research Labs in Dublin and since then he has been working on the AIE architecture. In 2018 he moved from the Research Labs to the Central Products Group to continue working on the AIE project and is now part of AMD since the acquisition of Xilinx. Currently David is a Principal Member Technical Staff - Computer Architecture and is leading a team delivering next-generation AIE Architecture Specification, simulation, and validation.
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