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Building Deep Networks on Grassmann Manifolds

Zhiwu Huang, Jiqing Wu, Luc Van Gool
Association for the Advancement of Artificial Intelligence (AAAI)
February 2018, in press

Abstract

Learning representations on Grassmann manifolds is popular in quite a few visual recognition tasks. In order to enable deep learning on Grassmann manifolds, this paper proposes a deep network architecture by generalizing the Euclidean network paradigm to Grassmann manifolds. In particular, we design full rank mapping layers to transform input Grassmannian data to more desirable ones, exploit re-orthonormalization layers to normalize the resulting matrices, study projection pooling layers to reduce the model complexity in the Grassmannian context, and devise projection mapping layers to respect Grassmannian geometry and meanwhile achieve Euclidean forms for regular output layers. To train the network, we exploit a stochastic gradient descent setting on manifolds of the connection weights, and study a matrix generalization of backpropagation to update the structured data. We experimentally evaluate the proposed network for three visual classification tasks, and show that it has clear advantages over existing Grassmann learning methods, and achieves results comparable with state-of-the-art approaches.


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@InProceedings{eth_biwi_01407,
  author = {Zhiwu Huang and Jiqing Wu and Luc Van Gool},
  title = {Building Deep Networks on Grassmann Manifolds },
  booktitle = {Association for the Advancement of Artificial Intelligence (AAAI)},
  year = {2018},
  month = {February},
  keywords = {},
  note = {in press}
}