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Robust Decentralized Learning Using ADMM with Unreliable Agents

arXiv.org Machine Learning

Many machine learning problems can be formulated as consensus optimization problems which can be solved efficiently via a cooperative multi-agent system. However, the agents in the system can be unreliable due to a variety of reasons: noise, faults and attacks. Thus, providing falsified data leads the optimization process in a wrong direction, and degrades the performance of distributed machine learning algorithms. This paper considers the problem of decentralized learning using ADMM in the presence of unreliable agents. First, we rigorously analyze the effect of falsified updates (in ADMM learning iterations) on the convergence behavior of multi-agent system. We show that the algorithm linearly converges to a neighborhood of the optimal solution under certain conditions and characterize the neighborhood size analytically. Next, we provide guidelines for network structure design to achieve a faster convergence. We also provide necessary conditions on the falsified updates for exact convergence to the optimal solution. Finally, to mitigate the influence of unreliable agents, we propose a robust variant of ADMM and show its resilience to unreliable agents.


Robots get closer to human-like dexterity

MIT Technology Review

It might not look that special, but the robot above is, according to a new measure, the most dexterous one ever created. Among other tricks, it could sort through your junk drawer with unrivaled speed and skill. The key to its dexterity is not in its mechanical grippers but in its brain. The robot uses software called Dex-Net to determine how to pick up even odd-looking objects with incredible efficiency. The new robot was built by Ken Goldberg, a professor at UC Berkeley, and one of his graduate students, Jeff Mahler. Goldberg will demonstrate the latest version of it at EmTech Digital, an event in San Francisco organized by MIT Technology Review and dedicated to artificial intelligence.


How artificial intelligence and data add value to businesses

#artificialintelligence

Artificial intelligence will transform many companies and create completely new types of businesses. The cofounder of Coursera, AI Fund, and Landing.AI shares how businesses can benefit. Artificial intelligence (AI) is at the cutting edge of innovation. But how do companies find the expertise necessary to utilize it, and then take it to market? In this video, recorded at the Aspen Ideas Festival in June, Andrew Ng, cofounder of Coursera, AI Fund, and Landing.AI, discusses the difference between an AI-enabled business versus a true AI company, and how businesses can organize, hire, and make use of AI to add value.


Plastics igus parts power FIRST robotics team to three records in FTC competition - The Robot Report

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Two high school robotics teams from Pittsburgh, Pa. recently used products from igus, a German-based manufacturer of engineered plastics with a presence in East Providence, R.I., to set four world records in this year's FIRST Tech Challenge global robotics competition. Team #8393 -- The Giant Diencephalic BrainSTEM Robotics Team, captained by senior James Walton -- joined forces with the rookie team they have been mentoring this season (Team #6931 -- the Substantial Monocephalic BrainSTEM Robotics team) to set their third world record at the South Central Regional Qualifier in York, Pennsylvania. The teams set the record for the most points scored in the 2018 FTC Challenge: Relic Recovery. This challenge requires robots to collect and score glyphs (foam cubes) in various patterns, retrieve jewels, transfer relics, park on balancing stones, and navigate to specific parts of the playing field -- sometimes autonomously. The BrainSTEM robots include spinning collectors, elevating depositing-platforms and robotic arms all built onto fast moving omnidirectional drivetrains.


Artificial Intelligence in education - How it improves the learning experience? - Fedena Blog

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Artificial intelligence (AI) is now a part of our lives whether we know it or not, and whether we accept it or not. It has risen to such a status over the years in a slow but steady manner. Everything that we do like buying clothes and shoes on the internet as well as watching shows on TV is influenced to various extents by AI. However, the question that needs to be asked in this context is what effect would this have on education? The fact of the matter is that AI does not take away, in way, shape, or form, from the classroom. Rather it makes the classroom experience a lot better than before.


Why Women Must Fill The Data Scientist Demand

#artificialintelligence

Every day we hear about more and more jobs disappearing, yet the data science community cannot keep up with unprecedented demand. When you consider the growth of this industry, it's not surprising to hear there will be a shortage of 1.5 million analysts capable of analyzing big data in the U.S. alone, by 2018, according to McKinsey. Globally, demand for data scientists is projected to exceed supply by more than 50 percent by 2018. It appears women are deterred from jobs in data science for the same reason they are deterred from other STEM fields. But interestingly, some stereotypically female traits are exactly the qualities that make for a successful data scientist.


Artificial Intelligence and Deep Learning For the Extremely Confused

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These complex and abstract representations can then be identified anywhere in the image. One drawback to CNN's is that increasing model power requires increased model depth. This increases the number of parameters in the model, lengthening training time and predisposing to the vanishing gradient problem, where gradients disappear and the model stalls in stochastic gradient descent, failing to converge. The introduction of Residual Networks in 2015 (ResNets) solved some of the problems with increasing network depth, as residual connections (seen above in a DenseNet) allow backpropagation to take a gradient from the last layer and follow it through all the way to the first layer. Recognition that CNN's are agnostic to position, but not orientation is important to note.


Machine Learning can transform education

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Futurist Arthur C. Clarke wrote, "Any sufficiently advanced technology is indistinguishable from magic." The magic of software (giving data and rules to get answers) is often confused with the magic of machine learning (giving data and answers to get rules) but it is machine learning not software that is transforming the world of computer chess. So far, computer chess programs codified the actions of the best human players and inevitably pivoted around the strategy of "material", wherein the number and value of pieces mattered most. Reports suggest AlphaZero taught itself chess from scratch in just four hours by playing against itself and rejected human rules developed over centuries. As it started with only the basic rules, researchers suggest that its lack of knowledge of human chess history may have enabled AlphaZero to see the game in a fresh way.


Getting ready for AI, and the future of jobs and work

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WORLDWIDE revenue from AI will surge past US$46 billion in 2020, according to research firm IDC. In Asia-Pacific, this is projected to rise to US$6.8 billion by 2021. Though researchers have been working on AI decades, development has accelerated in the past few years thanks to three factors โ€“ the ubiquitous availability of data, the growing capabilities of cloud computing, and more powerful algorithms developed by AI researchers. Most recently, a team of Microsoft researchers have developed the first machine translation system that can translate sentences of news articles from Chinese to English with the same quality and accuracy as a person. Throughout history, the emergence of new technologies has been accompanied by dire warnings about human redundancy.


Deep learning: Why it's time for AI to get philosophical

#artificialintelligence

Catherine Stinson is a postdoctoral scholar at the Rotman Institute of Philosophy, at the University of Western Ontario, and former machine-learning researcher. I wrote my first lines of code in 1992, in a high school computer science class. When the words "Hello world" appeared in acid green on the tiny screen of a boxy Macintosh computer, I was hooked. I remember thinking with exhilaration, "This thing will do exactly what I tell it to do!" and, only half-ironically, "Finally, someone understands me!" For a kid in the throes of puberty, used to being told what to do by adults of dubious authority, it was freeing to interact with something that hung on my every word โ€“ and let me be completely in charge. For a lot of coders, the feeling of empowerment you get from knowing exactly how a thing works โ€“ and having complete control over it โ€“ is what attracts them to the job.