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    Facebook trains AI robot to navigate ‘without a map’

    Facebook has developed a reinforcement learning algorithm which it claims lets a robot find its way in an unfamiliar environment "without using a map". The algorithm uses a depth-sensing camera, GPS and compass to get a robot to its goal with a "success rate of 99.9%".


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    It’s already possible for robots to navigate without maps, but having them navigate well is another matter. You don’t want them to waste time backtracking, let alone fall down if they bump into an unexpected obstacle. Facebook might have a solution. It recently developed a distributed reinforcement learning algorithm that not only reaches its destination 99.9 percent of the time without using maps, but can do so with just a three percent deviation from the ideal path. DD-PPO (Decentrialized Distributed Proximal Policy Optimization), as it’s called, doesn’t need more than a standard RGB camera with depth data, GPS and a compass.

    The trick was to implement a new training method that scaled well and stayed in sync no matter what the workload. Previous projects tend to struggle without massive computational power. Facebook taught a virtual agent to handle point-to-point navigation for the equivalent of 80 years of human experience — that’s about 2.5 billion steps. The result is an algorithm that, in indoor environments, is smart enough to choose the right fork in the path and quickly recognize errors when it does head in the wrong direction. It’s learning to understand the “structural regularities” of buildings, Facebook speculated.

    The technology is still very young. It has yet to handle outdoors or complex situations, and it doesn’t handle long-distance navigation well if it has to lose sensors. Facebook is sharing its work in hopes of further advances, though. If that happens, it could not only help robots move gracefully from room to room, but help with augmented reality glasses and other systems that help you navigate unfamiliar spaces.

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