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 [BibTeX] [Marc21]
Small Variance Asymptotics for Non-Parametric Online Robot Learning
Type of publication: Journal paper
Citation: Tanwani_IJRR_2019
Publication status: Published
Journal: International Journal of Robotics Research (IJRR)
Volume: 38
Number: 1
Year: 2019
Pages: 3-22
Abstract: Small variance asymptotics is emerging as a useful technique for inference in large scale Bayesian non-parametric mixture models. This paper analyses the online learning of robot manipulation tasks with Bayesian non-parametric mixture models under small variance asymptotics. The analysis yields a scalable online sequence clustering (SOSC) algorithm that is non-parametric in the number of clusters and the subspace dimension of each cluster. SOSC groups the new datapoint in low dimensional subspaces by online inference in a non-parametric mixture of probabilistic principal component analyzers (MPPCA) based on Dirichlet process, and captures the state transition and state duration information online in a hidden semi-Markov model (HSMM) based on hierarchical Dirichlet process. A task-parameterized formulation of our approach autonomously adapts the model to changing environmental situations during manipulation. We apply the algorithm in a teleoperation setting to recognize the intention of the operator and remotely adjust the movement of the robot using the learned model. The generative model is used to synthesize both time-independent and time-dependent behaviours by relying on the principles of shared and autonomous control. Experiments with the Baxter robot yield parsimonious clusters that adapt online with new demonstrations and assist the operator in performing remote manipulation tasks.
Keywords: robot learning
Projects Idiap
Authors Tanwani, A. K.
Calinon, Sylvain
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Total mark: 0
  • Tanwani_IJRR_2018.pdf