30th May 2013

Beer-pouring robot programmed to anticipate human actions

A robot in Cornell's Personal Robotics Lab has learned to foresee human action in order to step in and offer a helping hand – or more accurately, roll in and offer a helping claw.

Understanding when and where to pour a beer or knowing when to offer assistance opening a refrigerator door can be difficult for a robot because of the many variables it encounters while assessing the situation. A team from Cornell has created a solution.

Gazing intently with a Microsoft Kinect 3-D camera and using a database of 3D videos, the Cornell robot identifies the activities it sees, considers what uses are possible with the objects in the scene and determines how those uses fit with the activities. It then generates a set of possible continuations into the future – such as eating, drinking, cleaning or putting away – and finally chooses the most probable. As the action continues, the robot constantly updates and refines its predictions.

"We extract the general principles of how people behave," said Ashutosh Saxena, Cornell professor of computer science and co-author of a new study tied to the research. "Drinking coffee is a big activity, but there are several parts to it." The robot builds a "vocabulary" of these smaller parts that it can put together in various ways to recognise a variety of bigger activities, he explained.

In tests, the robot made correct predictions 82 percent of the time when looking one second into the future, 71 percent correct for three seconds and 57 percent correct for 10 seconds.

"Even though humans are predictable, they are only predictable part of the time," Saxena said. "The future would be to figure out how the robot plans its action. Right now we are almost hard-coding the responses, but there should be a way for the robot to learn how to respond."

Saxena will join Cornell graduate student Hema S. Koppula as they present their research at the International Conference of Machine Learning, 18-21 June in Atlanta, and the Robotics: Science and Systems conference, 24-28 June in Berlin, Germany. Their research was supported by the U.S. Army Research Office, the Alfred P. Sloan Foundation and Microsoft.

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