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A Multi-armed Bandit to Smartly Select a Training Set from Big Medical Data

  • Benjamín GutiérrezEmail author
  • Loïc Peter
  • Tassilo Klein
  • Christian Wachinger
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 10435)

Abstract

With the availability of big medical image data, the selection of an adequate training set is becoming more important to address the heterogeneity of different datasets. Simply including all the data does not only incur high processing costs but can even harm the prediction. We formulate the smart and efficient selection of a training dataset from big medical image data as a multi-armed bandit problem, solved by Thompson sampling. Our method assumes that image features are not available at the time of the selection of the samples, and therefore relies only on meta information associated with the images. Our strategy simultaneously exploits data sources with high chances of yielding useful samples and explores new data regions. For our evaluation, we focus on the application of estimating the age from a brain MRI. Our results on 7,250 subjects from 10 datasets show that our approach leads to higher accuracy while only requiring a fraction of the training data.

Notes

Acknowledgements

This work was supported in part by SAP SE, the Faculty of Medicine at LMU (FöFoLe), and the Bavarian State Ministry of Education, Science and the Arts in the framework of the Centre Digitisation.Bavaria (ZD.B).

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Benjamín Gutiérrez
    • 1
    • 2
    Email author
  • Loïc Peter
    • 2
    • 3
  • Tassilo Klein
    • 4
  • Christian Wachinger
    • 1
  1. 1.Artificial Intelligence in Medical Imaging (AI-Med)KJP, LMU MünchenMunichGermany
  2. 2.CAMPTechnische Universität MünchenMunichGermany
  3. 3.Translational Imaging GroupUniversity College LondonLondonUK
  4. 4.SAP SE BerlinBerlinGermany

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