2018

Invariant and Equivariant Graph Networks

Maron, Haggai, Ben-Hamu, Heli, Shamir, Nadav et al.

Understand

Invariant and equivariant networks have been successfully used for learning images, sets, point clouds, and graphs.

  • A basic challenge in developing such networks is finding the maximal collection of invariant and equivariant linear layers.
  • Although this question is answered for the first three examples (for popular transformations, at-least), a full characterization of invariant and equivariant linear layers for graphs is not known.
  • In this paper we provide a characterization of all permutation invariant and equivariant linear layers for (hyper-)graph data, and show that their dimension, in case of edge-value graph data, is 2 and 15, respectively.

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