Search Results for author: Pekka Pankka

Found 2 papers, 0 papers with code

TILT: topological interface recovery in limited-angle tomography

no code implementations25 Oct 2023 Elli Karvonen, Matti Lassas, Pekka Pankka, Samuli Siltanen

A novel reconstruction method is introduced for the severely ill-posed inverse problem of limited-angle tomography.

Deep Invertible Approximation of Topologically Rich Maps between Manifolds

no code implementations2 Oct 2022 Michael Puthawala, Matti Lassas, Ivan Dokmanic, Pekka Pankka, Maarten de Hoop

By exploiting the topological parallels between locally bilipschitz maps, covering spaces, and local homeomorphisms, and by using universal approximation arguments from machine learning, we find that a novel network of the form $\mathcal{T} \circ p \circ \mathcal{E}$, where $\mathcal{E}$ is an injective network, $p$ a fixed coordinate projection, and $\mathcal{T}$ a bijective network, is a universal approximator of local diffeomorphisms between compact smooth submanifolds embedded in $\mathbb{R}^n$.

Topological Data Analysis

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