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DeepSphere: a graph-based spherical CNN

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arxiv 2012.15000 v1 pith:DYNE7DXY submitted 2020-12-30 cs.LG cs.CVstat.ML

DeepSphere: a graph-based spherical CNN

classification cs.LG cs.CVstat.ML
keywords deepsphereefficiencyequivariancegraphsphericalaffectedanisotropicavailable
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Designing a convolution for a spherical neural network requires a delicate tradeoff between efficiency and rotation equivariance. DeepSphere, a method based on a graph representation of the sampled sphere, strikes a controllable balance between these two desiderata. This contribution is twofold. First, we study both theoretically and empirically how equivariance is affected by the underlying graph with respect to the number of vertices and neighbors. Second, we evaluate DeepSphere on relevant problems. Experiments show state-of-the-art performance and demonstrates the efficiency and flexibility of this formulation. Perhaps surprisingly, comparison with previous work suggests that anisotropic filters might be an unnecessary price to pay. Our code is available at https://github.com/deepsphere

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