Using active learning to allow activity recognition on a large scale

  • Authors:

  • Hande Alemdar;Tim L. M. van Kasteren;Cem Ersoy

  • Affiliations:

  • Department of Computer Engineering, NETLAB, Boğaziçi University, Istanbul, Turkey;Department of Computer Engineering, NETLAB, Boğaziçi University, Istanbul, Turkey;Department of Computer Engineering, NETLAB, Boğaziçi University, Istanbul, Turkey

  • Venue:
  • AmI'11 Proceedings of the Second international conference on Ambient Intelligence
  • Year:
  • 2011

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Abstract

Automated activity recognition systems that use probabilistic models require labeled data sets in training phase for learning the model parameters. The parameters are different for every person and every environment. Therefore, for every person or environment, training is needed to be performed from scratch. Obtaining labeled data requires much effort therefore poses challenges on the large scale deployment of activity recognition systems. Active learning can be a solution to this problem. It is a machine learning technique that allows the algorithm to choose the most informative data points to be annotated. Because the algorithm selects the most informative data points, the amount of the labeled data needed for training the model is reduced. In this study, we propose using active learning methods for activity recognition. We use three different informativeness measures for selecting the most informative data points and evaluate their performances using three real world data sets recorded in a home setting. We show through experiments that the required number of data points is reduced by 80% in House A, 73% in House B, and 66% in House C with active learning.