Permutation Invariance, DeepSets and Universal Function Approximation

This is a blog post by Ed Wagstaff, Martin Engelcke and me about if and when the DeepSets architecture limits universal function approximation. The post is very closely related to our 2019 ICML paper On the Limitations of Representing Functions on Sets, but should be significantly easier to process.

We wrote the post in collaboration with Ferenc Huszár and hosted it on his website: