The underlyingmetricis,however,non-parametric.Wedevelopamaximumlikelihood algorithm to infer the distribution parameters that relies on a combination of gradient descent and Monte Carlo integration. We further extend the LAND to mixture models, andprovidethecorresponding EMalgorithm.

The paper brings new insights into the connection between metric learning and Riemannian statistics. Having parametric and generative models that can go beyond the training data is very useful in many scenarios. However, what I am mainly concerned is its applicability to real world data which is both large scale and high-dimensional. LAND requires the computation of a (here, diagonal) covariance matrix for each data point and of its inverse, which in high dimensions are known to be hard problems. The authors do mention high-dimensionality as a possible issue (lines 265-266), but the paper would need an analysis of the complexity and limitations of the metric introduced. How high is here high-dimensional?

Taipei, Taiwan – Imagine boarding a train that glides above the ground at supersonic speeds. Speeding through an airless tube using powerful electro-magnets, passengers could travel from San Francisco to Los Angeles, London to Paris, or Basra to Baghdad in less than an hour. The train would be potentially greener than existing modes of transportation, too, using electricity that could be drawn from renewable energy sources. While it may sound like the stuff of science fiction, scientists and engineers in multiple countries are working on making the concept of the so-called hyperloop a reality. Hyperloop proponents, who include tech billionaire Elon Musk, have announced a series of recent breakthroughs in progressing the technology, whose development has been plagued by commercial setbacks and doubts about its feasibility.

Check out all the on-demand sessions from the Intelligent Security Summit here. A shopper is perusing the Lands' End website -- either because they are loyal to the brand, occasionally buy items when they're on sale, or happened there after Googling around for, say, a down winter coat with a fur-lined hood. Maybe they make a purchase, maybe they don't. But if they opt to provide their email, they might soon be alerted that doggy puffer vests and squall jackets are on sale (because they perused them thinking they might look cute on their dog); or that their favorite country star Blake Shelton has a new item in his Lands' End clothing line. This is the type of personalized experience the retailer hopes to provide with its new partnership with Movable Ink. Lands' End announced today that it will leverage Movable Ink's AI-powered Da Vinci platform to bolster the retailer's email marketing program.

Robofly, designed by engineers from the University of Washington, can flap on its own, isn't tethered to any devices and powered by a laser beam. Slightly more substantial than a wooden toothpick, engineers from the University of Washington have created a robot insect that can fly untethered. Dubbed the RoboFly, the engineers gave the robotic flying insect a brain (a microcontroller) and offset the need for heavy electronics traditionally used to power miniature robotics by powering it with a laser beam. Engineers said that the biggest challenge to creating the free-flying robotic insect was to understand how to generate enough power for it to flap its wings. "Wing flapping is a power-hungry process, and both the power source and the controller that directs the wings are too big and bulky to ride aboard a tiny robot," said Sawyer Fuller, assistant professor, UW Department of Mechanical Engineering.

Alphabet's Sidewalk Labs will develop a futuristic, billion-dollar community along a sizable swathe of Toronto's waterfront. On Wednesday, the City of Toronto and Sidewalk Labs -- which is the urban innovation arm of Google's parent company Alphabet -- announced a partnership to radically re-imagine 800 acres of the city's largely vacant, post-industrial Eastern Waterfront, and turn it into a tech-integrated neighborhood called Quayside. SEE ALSO: Balloons may be Puerto Rico's best chance for communication Sidewalk Labs released a 196-page document brimming with the company's extensive ideas, including high-speed ferries, parks that can be adapted to the seasons, and robotic waste removal vehicles. Sidewalk Lab's plan to fuse smart urban planning with technology is still just a visionary document, but if realized, would likely benefit both the company and Toronto. Sidewalk Labs doesn't get any ownership of the neighborhood, but gets a massive slab of land to deploy its innovative urban experiment.

My family was in the next room, laughing and screwing around with Legos or puzzles or something. I was standing in the middle of a rocky amphitheater, that looked like Monument Valley, Arizona. I really don't know where I was, but it was at the edge of a sandstone dais, and something like Stonehenge was orbiting overhead. The GearVR strapped to my noggin didn't feel heavy at all. I was in Land's End, having a blast, solving my own puzzles in virtual reality.