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Poster
On Non-Linear operators for Geometric Deep Learning
Grégoire Sergeant-Perthuis · Jakob Maier · Joan Bruna · Edouard Oyallon

Wed Nov 30 02:00 PM -- 04:00 PM (PST) @ Hall J #821
This work studies operators mapping vector and scalar fields defined over a manifold $\mathcal{M}$, and which commute with its group of diffeomorphisms $\text{Diff}(\mathcal{M})$. We prove that in the case of scalar fields $L^p_\omega(\mathcal{M,\mathbb{R}})$, those operators correspond to point-wise non-linearities, recovering and extending known results on $\mathbb{R}^d$. In the context of Neural Networks defined over $\mathcal{M}$, it indicates that point-wise non-linear operators are the only universal family that commutes with any group of symmetries, and justifies their systematic use in combination with dedicated linear operators commuting with specific symmetries. In the case of vector fields $L^p_\omega(\mathcal{M},T\mathcal{M})$, we show that those operators are solely the scalar multiplication. It indicates that $\text{Diff}(\mathcal{M})$ is too rich and that there is no universal class of non-linear operators to motivate the design of Neural Networks over the symmetries of $\mathcal{M}$.

#### Author Information

##### Jakob Maier (INRIA Paris)

Currently doing a **PhD** on **efficient algorithms for information extraction on graphs** with **Laurent Massoulié** at INRIA Paris. Curious about graph neural networks, graph alignment, random spanning forests and very generally about theoretical guarantees in (Deep) learning.