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Understanding Patch-Based Learning of Video Data by Explaining Predictions

  • Christopher J. Anders
  • Grégoire MontavonEmail author
  • Wojciech Samek
  • Klaus-Robert Müller
Chapter
Part of the Lecture Notes in Computer Science book series (LNCS, volume 11700)

Abstract

Deep neural networks have shown to learn highly predictive models of video data. Due to the large number of images in individual videos, a common strategy for training is to repeatedly extract short clips with random offsets from the video. We apply the deep Taylor/Layer-wise Relevance Propagation (LRP) technique to understand classification decisions of a deep network trained with this strategy, and identify a tendency of the classifier to look mainly at the frames close to the temporal boundaries of its input clip. This “border effect” reveals the model’s relation to the step size used to extract consecutive video frames for its input, which we can then tune in order to improve the classifier’s accuracy without retraining the model. To our knowledge, this is the first work to apply the deep Taylor/LRP technique on any neural network operating on video data.

Keywords

Deep neural networks Video classification Human action recognition Explaining predictions 

Notes

Acknowledgements

This work was supported by the German Ministry for Education and Research as Berlin Big Data Centre (01IS14013A), Berlin Center for Machine Learning (01IS18037I) and TraMeExCo (01IS18056A). Partial funding by DFG is acknowledged (EXC 2046/1, project-ID: 390685689). This work was also supported by the Institute for Information & Communications Technology Planning & Evaluation (IITP) grant funded by the Korea government (No. 2017-0-00451, No. 2017-0-01779).

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Christopher J. Anders
    • 1
  • Grégoire Montavon
    • 1
    Email author
  • Wojciech Samek
    • 2
  • Klaus-Robert Müller
    • 1
    • 3
    • 4
  1. 1.Technische Universität BerlinBerlinGermany
  2. 2.Fraunhofer Heinrich Hertz InstituteBerlinGermany
  3. 3.Korea UniversitySeongbuk-gu, SeoulKorea
  4. 4.Max Planck Institute for InformaticsSaarbrückenGermany

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