We are concerned with the discovery of hierarchical relationships from large-scale unstructured similarity scores. For this purpose, we study different models of hyperbolic space and find that learning embeddings in the Lorentz model is substantially more efficient than in the Poincar\'e-ball model. We show that the proposed approach allows us to learn high-quality embeddings of large taxonomies which yield improvements over Poincar\'e embeddings, especially in low dimensions. Lastly, we apply our model to discover hierarchies in two real-world datasets: we show that an embedding in hyperbolic space can reveal important aspects of a company's organizational structure as well as reveal historical relationships between language families.

WASHINGTON – One U.S. special operations soldier was killed and four U.S. service members wounded in an "enemy attack" Friday in Somalia, the U.S. military said -- casualties that are likely to put renewed scrutiny on America's counterterror operations in Africa. It's the first public announcement of a U.S. military combat death on the continent since four U.S. service members were killed in a militant ambush in the west African nation of Niger in October. U.S. Africa Command said in a statement that U.S. troops with Somali and Kenyan forces came under mortar and small-arms fire in Jubaland, Somalia, at around 2.45 p.m. local time. One member of the "partner forces" was wounded. One of the wounded U.S. service members received sufficient medical care in the field, and the other three were medically evacuated for additional treatment.

The Department of Energy pulled back the curtain on the world's most powerful supercomputer Friday. When Summit is operating at max capacity, it can run at 200 petaflops -- that's 200 quadrillion calculations per second. That smokes the previous record holder, China's Sunway TaihuLight (which has a 93 petaflop capacity). Summit is also about seven times faster than Titan, the previous US record holder which is housed at the same Oak Ridge National Lab in Tennessee. For perspective, in one hour, Summit can solve a problem that it would take a desktop computer 30 years to crack.

According to the official, May would tell the summit that "it is worth stepping back to recall that the West, led by the U.S., devised the global rules-based system to enable our citizens to benefit from globalization while providing reassurance that we would all play by a common set of rules."

Brazilian startup Cobli has specialized in technological solutions for vehicle fleet monitoring and management. It is currently focusing on safety and refining a tool to identify driver behavioral patterns by analyzing data collected by a solar-powered tracker. The project is based on machine learning, an application of artificial intelligence, and had the support) from the São Paulo Research Foundation - FAPESP through its Innovative Research in Small Business Program (PIPE http://www.bv.fapesp.br/en/3). "The algorithm uses the data collected to establish a driving profile with more than 90% accuracy," says engineer Rodrigo Mourad, a partner and co-founder of Cobli. According to Mourad, in one or two weeks of use, the system can glean a sufficient amount of data - on speed, acceleration, braking and curve angles - to produce a profile of the driver's vehicle handling habits.

Video Friday is your weekly selection of awesome robotics videos, collected by your Automaton bloggers. We'll also be posting a weekly calendar of upcoming robotics events for the next few months; here's what we have so far (send us your events!): Let us know if you have suggestions for next week, and enjoy today's videos. Since its epic landing on Mars in 2012, rappelling down to the surface like a robot commando, the Curiosity Mars rover has been one of our favorite robots of all time, and space. Not only it's an impressive piece of engineering, it's also an amazing exploration tool to help humanity answer questions we've been asking ourselves for a very long time, including: Are we alone?

A cyber attack on a commercial aircraft is "only a matter of time", US government researchers have claimed in a report. "Potential of catastrophic disaster is inherently greater in an airborne vehicle," the Pacific Northwest National Laboratory – a laboratory within the Department of Energy - suggested. It was one of a series of a series of documents and slides from the Department of Energy and the Department of Homeland Security (DHS), as well as other agencies, which were obtained by a Freedom of Information Act request by the Motherboard website. GCHQ to brief England over Playstation and smartphone cyber-attacks Britain'must be prepared to launch cyber attacks on enemies' If Russia launches a cyber attack on the UK, this is what we can do UK anti-doping agency hit by cyber attack Britain'must be prepared to launch cyber attacks on enemies' The same research from the Pacific Northwest National Laboratory also claimed that it was "a matter of time before a cyber security breach on an airline occurs." It is not the first time concerns have been raised about the security vulnerabilities of commercial aircraft.

A funny thing has happened to Google and Amazon on their path toward high-tech success: They have become crucial cogs in the U.S. national security establishment. Both companies are expanding teams of employees with security clearances to work on projects that include deploying artificial intelligence and building digital "clouds" to offering law enforcement facial recognition tools that can even read the mood of people caught on camera. The security establishment's embrace of Big Tech has ruffled the feathers of traditional defense contractors and roiled employee ranks, in Google's case, over whether the company is being drawn into what disguntled employees called "the business of war." Defense industry analysts say the Pentagon views Big Tech, and particularly Google with its deep bench of artificial intelligence researchers, as vital to the nation's future safety. "They are becoming a critical part of national security, without question," said Alexander Rossino, a senior principal research analyst at Deltek, a Herndon, Virginia, firm that offers software and services to defense?

The competition for the world's fastest computer, ranked twice a year by computer scientists in the U.S. and Germany, is a point of national pride. The last time a U.S. computer held the top spot was in November 2012. The next ranking on June 25 comes against a backdrop of escalating tensions between the U.S. and China over trade and leadership in artificial intelligence and 5G wireless networks, advanced technologies deemed vital to national security. The new supercomputer, dubbed Summit and housed at the agency's Oak Ridge National Laboratory in Tennessee, can perform 200,000 trillion calculations a second, according to IBM--200 petaflops in industry parlance. That is eight times more powerful than Titan, a supercomputer made by Cray Inc., the lab's previous top performer.

The firm was working on the controversial Project Maven program - an artificial intelligence (AI) project that analyses imagery and could be used to enhance the efficiency of drone strikes. Google pledges to not work on weapons after Project Maven backlash Google'ditches contract with US military' after employee revolt Google collected personal data about iPhone users, High Court hears Google quietly removes'don't be evil' preface from code of conduct Google'ditches contract with US military' after employee revolt Google quietly removes'don't be evil' preface from code of conduct This week the tech giant's chief executive Sundar Pichai responded by unveiling his company's "concrete standards" surrounding AI. However, some have suggested that the AI Principles, appear more porous than Mr Pichai's language would seem to suggest. Mr Pichai begins by prefacing the seven-point list of "objectives for AI applications" by saying it is by no means fixed or solid. "We acknowledge that this area is dynamic and evolving," he says, adding that whatever principles are included are subject to change due to the company's "willingness to adapt" its approach.