Active learning of confidence measure function in robot language acquisition framework

In an object manipulation dialogue, a robot may misunderstand an ambiguous command from a user, such as “Place the cup down (on the table),” potentially resulting in an accident. Although making confirmation questions before all motion will decrease the risk of this failure, the user will find it more convenient if confirmation questions are not made under trivial situations. This paper proposes a method for estimating ambiguity in the commands by introducing an active learning framework with Bayesian logistic regression to human-robot spoken dialogue. We conducted physical experiments in which a user and a manipulator-based robot communicated in spoken language to manipulate toys.