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Learning Context on a Humanoid Robot using Incremental Latent Dirichlet Allocation
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Date
2016-03-01
Author
Çelikkanat, Hande
Orhan, Guner
Pugeault, Nicolas
Guerin, Frank
Şahin, Erol
Kalkan, Sinan
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In this paper, we formalize and model context in terms of a set of concepts grounded in the sensorimotor interactions of a robot. The concepts are modeled as a web using Markov Random Field (MRF), inspired from the concept web hypothesis for representing concepts in humans. On this concept web, we treat context as a latent variable of Latent Dirichlet Allocation (LDA), which is a widely-used method in computational linguistics for modeling topics in texts. We extend the standard LDA method in order to make it incremental so that: 1) it does not relearn everything from scratch given new interactions (i.e., it is online); and 2) it can discover and add a new context into its model when necessary. We demonstrate on the iCub platform that, partly owing to modeling context on top of the concept web, our approach is adaptive, online, and robust: it is adaptive and online since it can learn and discover a new context from new interactions. It is robust since it is not affected by irrelevant stimuli and it can discover contexts after a few interactions only. Moreover, we show how to use the context learned in such a model for two important tasks: object recognition and planning.
Subject Keywords
Software
,
Artificial Intelligence
URI
https://hdl.handle.net/11511/43339
Journal
IEEE TRANSACTIONS ON COGNITIVE AND DEVELOPMENTAL SYSTEMS
DOI
https://doi.org/10.1109/tamd.2015.2476374
Collections
Department of Computer Engineering, Article